Old 06-22-2013, 08:51 AM   #581
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Default Re: Terry's Astronomy Thread.

Thanks for the complements guys! The thread will be run as long as there are enough people who wish to see it. Feel free to throw in suggestions that could improve the current thread as well.

What's in the sky tonight?
June 22, 2013
-The largest full Moon of 2013 rises around sunset and shines all night. Tomorrow night it's almost as full and almost as large (for the longitudes of the Americas, since the Moon is exactly full at 7:32 a.m. Sunday morning EDT.) On both nights, though, this "supermoon" is only a trace larger than an average Moon: 7% wider.

-On June 21st at 03:16 UT, the sun itself marked the solstice with an M2-class solar flare from sunspot AR1777. NASA's Solar Dynamics Observatory photographed the extreme ultraviolet flash and a plume of material flying out of the blast site. As sunspots go, AR1777 is neither large nor apparently menacing, yet it has been crackling with flares for days. Before it rotated over the sun's eastern limb on June 20th, it unleashed a series of farside flares and CMEs. Today's explosion was not Earth directed, but future explosions could be as the sun's rotation continues to turn AR1777 toward our planet. NOAA forecasters estimate a 30% chance of M-flares and a 5% chance of X-flares during the next 24 hours.



Astro Picture of the Day:
June 22, 2013


Source:
As of today, our Sun begins its southern movement as a result we will experience shorter days. In the Netherlands, the duration of the day is now 16 hours and 45 minutes. With an empty beercan, many visitors of the Philippus Lansbergen Observatory in Middelburg, the Netherlands, captured the movement of the Sun with a single six month long exposure. The first solargraphs have been revealed, and this is the result of the sun's movement over the course of six months. This photo was taken by Jan Koeman. Missing sections represent cloudy ovvercast days. The general view that the Netherlands is often cloudy seems to be incorrect in the past six months as there is a large amount of sunlight present in the photo.
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Old 06-23-2013, 10:28 AM   #582
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
June 23, 2013
-This is the time of year when the two brightest stars of summer, Arcturus and Vega, are about equally high overhead shortly after dark. Arcturus is toward the southwest, Vega toward the east.

-Arcturus and Vega are 37 and 25 light-years away, respectively, and represent the two commonest types of naked-eye stars: a yellow-orange K giant and a white A main-sequence star. They're 150 and 50 times brighter than the Sun — which, combined with their nearness, is why they dominate the evening sky.

-Mercury is becoming a real challenge, rapidly fading and dropping below Venus very low in bright twilight. Bring binoculars. What's the last day you can keep it in view?

Astro Picture of the Day:
June 23, 2013


Source:
If you could look across Venus with radar eyes, what might you see? This computer reconstruction of the surface of Venus was created from data from the Magellan spacecraft. Magellan orbited Venus and used radar to map our neighboring planet's surface between 1990 and 1994. Magellan found many interesting surface features, including the large circular domes, typically 25-kilometers across, that are depicted above. Volcanism is thought to have created the domes, although the precise mechanism remains unknown. Venus' surface is so hot and hostile that no surface probe has lasted more than a few minutes.
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Old 06-24-2013, 05:28 AM   #583
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
June 24, 2013
-Look a third of the way from Arcturus to Vega for dim Corona Borealis, the semicircular Northern Crown. It has one moderately bright star, Alphecca (magnitude 2.2). Look two thirds of the way for the dim Keystone of Hercules, whose brightest star is magnitude 2.8.

Astro Picture of the Day:
June 24, 2013


Source:
What's happening to this spiral galaxy? Just a few hundred million years ago, NGC 2936, the upper of the two large galaxies shown, was likely a normal spiral galaxy - spinning, creating stars - and minding its own business. But then it got too close to the massive elliptical galaxy NGC 2937 below and took a dive. Dubbed the Porpoise Galaxy for its iconic shape, NGC 2936 is not only being deflected but also being distorted by the close gravitational interaction. A burst of young blue stars forms the nose of the porpoise toward the left of the upper galaxy, while the center of the spiral appears as an eye. Alternatively, the galaxy pair, together known as Arp 142, look to some like a penguin protecting an egg. Either way, intricate dark dust lanes and bright blue star streams trail the troubled galaxy to the lower right. The above recently-released image showing Arp 142 in unprecedented detail was taken by the Hubble Space Telescope last year. Arp 142 lies about 300 million light years away toward the constellation, coincidently, of the Water Snake (Hydra). In a billion years or so the two galaxies will likely merge into one larger galaxy.
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Old 06-25-2013, 05:39 AM   #584
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
June 25, 2013
-10,000 near-Earth asteroids and comets have now been discovered. The 10,000th object, asteroid 2013 MZ5, was detected on June 18th by the Pan-STARRS-1 telescope in Maui. Sobering estimate: NASA says there may be 10 times this number yet to find.

-During bright twilight today and tomorrow, Venus forms an almost straight line with Pollux and Castor low in the west-northwest. Bring binoculars, and look for them to Venus's right. And can you still detect Mercury below Venus? It's nearly as far below Venus (6°) as Pollux is to the right.

Astro Picture of the Day:
June 25, 2013


Source:
This is Mars - have a look around. More specifically, this is one area picked for its promise of holding clues to the habitability of Mars to ancient life. To better search for telling leads, the robotic Curiosity rover took a series of detailed images from a location called Rock Nest. Over 900 of these images were then composed into one of the highest resolution images ever created of the red planet - a composite containing over one billion pixels. Shown above, toward the middle of this image mosaic, is Mt. Sharp, the central peak of the large crater where the Curiosity rover landed and is currently exploring. An interactive and zoomable version of this image is available here. Over the next few years, Curiosity is scheduled to roll toward the peak of ancient Mt. Sharp, all the while keeping a lookout for distinguishing geological and chemical markers.
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Old 06-26-2013, 05:41 AM   #585
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
June 26, 2013
-Now that it's summer, the Summer Triangle stands high in full glory after dusk. Its top star is bright Vega high in the east. Deneb is the brightest star to Vega's lower left. Farther to Vega's lower right is Altair. The Summer Triangle is big: 35° long. Where the sky is dark, you can see that the Milky Way runs through it.

-Solar activity is low. None of the sunspots on the Earthside of the sun has the kind of complex magnetic field that harbors energy for strong flares. NOAA forecasters put the odds of an M-class solar flare at 20% on June 26th, waning to 10% on June 27th.

Astro Picture of the Day:
June 26, 2013


Source:
Andromeda is the nearest major galaxy to our own Milky Way Galaxy. Our Galaxy is thought to look much like Andromeda. Together these two galaxies dominate the Local Group of galaxies. The diffuse light from Andromeda is caused by the hundreds of billions of stars that compose it. The several distinct stars that surround Andromeda's image are actually stars in our Galaxy that are well in front of the background object. Andromeda is frequently referred to as M31 since it is the 31st object on Messier's list of diffuse sky objects. M31 is so distant it takes about two million years for light to reach us from there. Although visible without aid, the above image of M31 was taken with a small telescope. Much about M31 remains unknown, including how it acquired its unusual double-peaked center.
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Old 06-27-2013, 05:26 AM   #586
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
June 27, 2013
-Venus (magnitude –3.8) is gaining altitude very gradually, low in the west-northwest in evening twilight. Use binoculars to pick up Pollux and Castor off to its upper right or right.

-Mars and Jupiter remain hidden in the glare of the Sun.

-Every day, NASA's AIM spacecraft maps the distribution of noctilucent clouds (NLCs) around Earth's north pole. The results are displayed on spaceweather.com in the form of the "daily daisy." On June 20th, pilot Brian Whittaker flew past a vivid display of NLCs over the North Atlantic Ocean and he decided to compare his own view to that of AIM.

-"Once again, AIM's daily daisy-wheel allowed me to see where the northern horizon noctilucent clouds truly were!" says Whittaker. "This display reached a maximum height of about 10 degrees as seen from 37,000 feet at 50N latitude. It was my 4th and best sighting of 2013 so far."

-2013 is shaping up to be a good year for NLCs. The clouds surprised researchers by appearing early this year, and many bright displays have already been recorded. Once confined to the Arctic, NLCs have been sighted in recent years as far south as Utah, Colorado, and Nebraska. They might spread even farther south in 2013.

-Observing tips: Look west 30 to 60 minutes after sunset when the sun has dipped 6o to 16o below the horizon. If you see luminous blue-white tendrils spreading across the sky, you've probably spotted a noctilucent cloud.

-Here are the results:




Astro Picture of the Day:
June 27, 2013


Source:
This panoramic night scene from June 8 looks out across a Moscow skyline from atop the main building of Lomonosov Moscow State University. Shining in the darkened sky above are widespread noctilucent clouds. From the edge of space, about 80 kilometers above Earth's surface, the icy clouds can still reflect sunlight even though the Sun itself is below the horizon as seen from the ground. Usually spotted at high latitudes in summer months the diaphanous apparitions, also known as polar mesospheric clouds, have come early this season. The seasonal clouds are understood to form as water vapor driven into the cold upper atmosphere condenses on the fine dust particles supplied by meteor smoke (debris left by disintegrating meteors) or volcanic ash. Their early start this year may be connected to changing global circulation patterns in the lower atmosphere. During this northern summer, NASA's AIM mission provides daily projections of the noctilucent clouds as seen from space.
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Old 06-28-2013, 05:55 AM   #587
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
June 28, 2013
-Southern hemisphere sunspots AR1777 and AR1778 erupted in quick succession during the early hours of June 28th, producing a pair of C-class solar flares and at least one CME. An initial analysis of coronagraph images suggests that the CME could deliver a glancing blow to Earth's magnetic field over the weekend.

-The Big Dipper, still high in the northwest, is moving a little lower now and starting to dip around toward the right. Follow the curve of its tail a little more than a Dipper-length left to bright Arcturus high in the southwest.

Astro Picture of the Day:
June 28, 2013


Source:
A Full Perigee Moon rose as the Sun set last Sunday. At its closest to Earth it was, by just a bit, the year's brightest and largest Full Moon also known as a Super Moon. Seen from Punta Piedras, Argentina and the mouth of the Rio de La Plata, near Buenos Aires, the Super Moon's light created this magnificent circular lunar halo. Still, the size of a lunar halo is determined by the geometry of six sided water ice crystals in planet Earth's high, thin clouds. The crystals deflect the rays of moonlight more strongly through a minimum angle of 22 degrees. So this halo has an inner radius of 22 degrees, just like the halos of the less-than-super moons. Even more common than a Super Moon, beautiful 22 degree halos can be spotted at any time of year.
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Old 06-29-2013, 04:34 AM   #588
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
June 29, 2013
-This is the time of year when, after dark, the dim Little Dipper floats straight upward from Polaris (the end of its handle) — like a helium balloon on a string escaped from some summer evening party.

-Mercury is lost in the glare of the Sun.

A strong (Kp=7) geomagnetic storm is in progress on June 28-29 as Earth passes through a region of south-pointing magnetism in the solar wind. The storm has sparked Northern Lights photographed in the USA as far south as Kansas. Christian Begeman sends this picture from a farm outside Hartford, South Dakota:

"A clear sky allowed me to the Northern Lights dancing in southeast South Dakota around the midnight hour tonight," says Begeman. "It was quite the show."

High-latitude sky watchers should remain alert for auroras in the hours ahead. Solar wind conditions continue to favor geomagnetic activity.



Astro Picture of the Day:
June 29, 2013


Source:
Once known as Earth's sunset comet, PanSTARRS (C/2011 L4) is up all night now, but only for northern hemisphere skygazers. Telescopes are required to track its progress as it fades and heads for the outer solar system. But because planet Earth passed through the comet's orbital plane in late May, PanSTARRS will also be remembered for its remarkably long anti-tail. That edge-on perspective looking along the broad, fanned-out dust tail as it trailed behind the comet created the appearance of an anti-tail pointing in the sunward direction, back toward the inner solar system. Recorded on the night of May 27, this 13 pane mosaic (shown in positive and negative views) follows PanSTARRS' anti-tail as it stretches over 7 degrees from the comet's coma at the far right. The anti-tail was likely much longer, but gets lost in the evening's bright moonlight encroaching on the left edge of the scene. Background star cluster NGC 188 in Cepheus shows up along the way, near top left.
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Old 06-29-2013, 04:35 AM   #589
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Default Re: Terry's Astronomy Thread.

Holy shit that first picture, not even kidding, I thought it was photo shopped. That's absolutely beautiful, didn't know those kinds of colors were even possible in real life...
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Old 06-30-2013, 10:03 AM   #590
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
June 30, 2013
-Vega is the brightest star high in the east. Right next to Vega lies one of the best-known multiple stars in the sky: 4th-magnitude Epsilon (ε) Lyrae, the Double-Double. It forms one corner of a roughly equilateral triangle with Vega and Zeta (ζ) Lyrae. The triangle is less than 2° on a side. A 4-inch telescope at 100× or more should resolve each of Epsilon's two wide components into a tight pair.
Zeta Lyrae is also a double star for binoculars; much tougher, but easily split with a telescope.

-As the current spate of geomagnetic storming subsides, more storms could be in the offing. A coronal mass ejection (CME), pictured below, is expected to deliver a glancing blow to Earth's magnetic field late on June 30th or early on July 31st.

-The cloud was propelled in our direction during the early hours of June 28th when magnetic filaments around sunspot AR1777 erupted. The explosion registered approximately C4 on the Richter Scale of Solar Flares. Because the CME is not heading squarely toward Earth, there is still a chance that it will miss.

For understanding the RIchter Scale of Solar Flares: http://www.spaceweather.com/glossary...8s4qc6tuni8p14



News Posted Today:
June 29, 2013
Good-bye to GALEX


Astro Picture of the Day:
June 30, 2013


Source:
What lies at the bottom of Hyperion's strange craters? Nobody's sure. To help find out, the robot Cassini spacecraft now orbiting Saturn swooped past the sponge-textured moon in 2005 and 2010 and took images of unprecedented detail. An image from the 2005 pass, shown above in false color, shows a remarkable world strewn with strange craters and a generally odd surface. The slight differences in color likely show differences in surface composition. At the bottom of most craters lies some type of unknown dark material. Inspection of the image shows bright features indicating that the dark material might be only tens of meters thick in some places. Hyperion is about 250 kilometers across, rotates chaotically, and has a density so low that it might house a vast system of caverns inside.
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Old 07-1-2013, 09:23 AM   #591
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
July 1, 2013
-If you have a dark enough sky, the Milky Way now forms a magnificent arch high across the whole eastern sky after nightfall is complete. It runs all the way from below Cassiopeia low in the north-northeast, up and across Cygnus and the Summer Triangle in the east, and down past the spout of the Sagittarius Teapot in the south-southeast.

News Posted Today:
June 30, 2013
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Astro Picture of the Day:
July 1, 2013


Source:
On June 28, Earth passed through a region of south-pointing magnetism in the solar wind. The encounter set off one of the finest geomagnetic storms of the current solar cycle. At its peak on June 29th, the strong (Kp=7) storm filled the sky over Alberta Canasa with bright green auroras:

"With advance warning from Spaceweather.com, I headed out Friday night to a wind farm near my rural home, to take images of what I hoped would be an all-sky aurora. It did not disappoint!" says photographer Alan Dyer of Drumheller, Alberta. "These images are taken from the base of one of the massive wind machines, seemingly aimed into the aurora blown by the solar wind."

For a brief time, the auroras spilled across the Canadian border into the USA as south as Iowa, Oregon, Nebraska, and Kansas. In total, observers in more than a dozen US states reported visual or photographic sightings of auroras.
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Old 07-2-2013, 07:13 PM   #592
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Default Re: Terry's Astronomy Thread.

Today is late because FFR appeared to be down this morning - and I was unable to access the site during work.

What's in the sky tonight?
July 2, 2013
-The Big Dipper, high in the northwest after dark, is turning around to "scoop up water" through the nights of summer and early fall.

-The "noctilucent daisy" continues to expand and intensify as summer unfolds. Observers in central-to-northern Europe are reporting vivid, nightly displays of NLCs. Just hours ago, Alan Tough photographed these over Lossiemouth, Moray, Scotland.

"This was another spectacular display of noctilucent clouds," says Tough. "I arrived in Lossiemouth in time to see the Moon rising and managed to capture its glitter path on the River Lossie."



Astro Picture of the Day:
July 2, 2013


Source:
What would it look like to go right up to a black hole? One particularly interesting place near a black hole is its photon sphere, where photons can orbit in circles, a sphere 50 percent further out than the event horizon. Were you to look out from the photon sphere of a black hole, half of the sky would appear completely black, half of the sky would appear unusually bright, and the back of your head would appear across the middle. The above computer-animated video depicts this view from the photon sphere. The reason that the lower region, as shown, appears black is because all light paths from this dark region comes up from the black hole - which classically emits no light. The upper half of the sky now appears unusually bright, blueshifted, and shows increasingly many complete sky images increasingly close to the dark-light divide across the middle. That dark-light divide is the photon sphere - your location - and since photons can do circles there, light from the back of your head can circle the black hole and come to your eye. No place on the sky is hidden from you - stars that would normally pass behind the black hole now appear to zip quickly around an Einstein ring, a ring that appears above as a horizontal line about a quarter of the way down from the video top. (Disclosure: Video creator Robert Nemiroff is an editor for APOD.)
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Old 07-3-2013, 05:45 AM   #593
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
July 3, 2013
-A twilight challenge: As twilight fades, spot Venus low in the west-northwest. As darkness deepens, can you make out stars of the Beehive Cluster within about ½° below it? Good luck — the brightest of them are 6th magnitude, about 10,000 times fainter than Venus!

-A much easier challenge: Look ½° above Saturn soon after dark for the 4.2-magnitude star Kappa Virginis.



Astro Picture of the Day:
July 3, 2013


Source:
It may appear, at first, like the Galaxy is producing the lightning, but really it's the Earth. In the foreground of the above picturesque nighttime landscape is the Greek Island of Corfu, with town lights surrounding Lake Korrision. Visible farther in the distance are lights from the town of Preveza on the Greek mainland. In the more distant sky a thunderstorm is threatening, with two lightning strokes caught together during this 45 second wide-angle exposure taken in mid-May. The lightning branch on the left appears to be striking near Preveza, whereas the lightning strike on the right appears to be striking near Mount Ainos on the Greek Island of Cephalonia. Much farther in the distance, strewn about the sky, are hundreds of stars in the neighborhood of our Sun in the Milky Way Galaxy. Furthest away, arching over the entire panorama, are billions of stars that together compose the central band of our Milky Way.
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Old 07-4-2013, 05:52 AM   #594
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
July 4, 2013
-Watching the fireworks tonight? As you're waiting for them to begin, point out to people some sky sights. The two brightest stars of summer, Vega and Arcturus, are high overhead toward the east and southwest, respectively. Far below Arcturus are the planet Saturn and, to its lower right, Spica. Nearly that high in the southeast is the orange-red supergiant Antares, amid fainter stars of upper Scorpius.

-The July waning crescent Moon passes landmarks of Taurus. The visibility of faint objects in twilight is exaggerated here; binoculars help. The blue 10° scale is about the width of your fist at arm's length.



Astro Picture of the Day:
July 4, 2013


Source:
Also known as the Cigar Galaxy for its elongated visual appearance, M82 is a starburst galaxy with a superwind. In fact, through ensuing supernova explosions and powerful winds from massive stars, the burst of star formation in M82 is driving a prodigious outflow of material. Evidence for the superwind from the galaxy's central regions is clear in this sharp telescopic snapshot. The composite image highlights emission from long outflow filaments of atomic hydrogen gas in reddish hues. Some of the gas in the superwind, enriched in heavy elements forged in the massive stars, will eventually escape into intergalactic space. Including narrow band image data in the deep exposure has revealed a faint feature dubbed the cap. Perched about 35,000 light-years above the galaxy at the upper left, the cap appears to be galactic halo material ionized by the superwind shock or intense ultraviolet radiation from the young, massive stars in the galaxy's core. Triggered by a close encounter with nearby large galaxy M81, the furious burst of star formation in M82 should last about 100 million years or so. M82 is 12 million light-years distant, near the northern boundary of Ursa Major.
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Old 07-5-2013, 06:04 AM   #595
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
July 5, 2013
-During dawn this morning and Saturday morning, look low in the east-northeast for the waning Moon. It guides your way to Mars, Jupiter, Aldebaran, and Beta Tauri, as shown at right. Binoculars will help.

-Earth is at aphelion, its farthest from the Sun for the year (just 1 part in 30 farther than at perihelion in January).



Astro Picture of the Day:
July 5, 2013


Source:
Some 13,000 light-years away toward the southern constellation Pavo, the globular star cluster NGC 6752 roams the halo of our Milky Way galaxy. Over 10 billion years old, NGC 6752 follows clusters Omega Centauri and 47 Tucanae as the third brightest globular in planet Earth's night sky. It holds over 100 thousand stars in a sphere about 100 light-years in diameter. Telescopic explorations of the NGC 6752 have found that a remarkable fraction of the stars near the cluster's core, are multiple star systems. They also reveal the presence of blue straggle stars, stars which appear to be too young and massive to exist in a cluster whose stars are all expected to be at least twice as old as the Sun. The blue stragglers are thought to be formed by star mergers and collisions in the dense stellar environment at the cluster's core. This sharp color composite also features the cluster's ancient red giant stars in yellowish hues.
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Old 07-6-2013, 09:57 AM   #596
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
July 6, 2013
-Two hours after sunset, after darkness is truly complete, the east-northeast horizon bisects the Great Square of Pegasus across two of its opposite corners. By midnight the whole Great Square is up in good view, balancing on its bottom corner.

-Observers of noctilucent clouds often describe their appearance as "electric blue." The pale blue colors of the two phenomena are similar, but the resemblance is superficial. Lightning is hot, a genuinely electric discharge that heats the air to 30,000o C or more. The high temperature of the lightning's plasma (ionized air) gives it the same blue color as a hot O-type star. On the other hand, noctilucent clouds are cold, made of ice that crystallizes at the edge of space where the air temperature is -160o C. The tiny ice crystals in noctilucent clouds scatter blue light from the setting sun, which accounts for their lightning-like color. On July 3rd, Nature provided a color-check when a lightning storm erupted in Szubin, Poland, right in front of a noctilucent display. Marek Nikodem photographed the ensemble:




Astro Picture of the Day:
July 6, 2013


Source:
The universe is filled with galaxies. But to see them astronomers must look out beyond the stars of our own galaxy, the Milky Way. This colorful Hubble Space Telescopic portrait features spiral galaxy NGC 6384, about 80 million light-years away in the direction of the constellation Ophiuchus. At that distance, NGC 6384 spans an estimated 150,000 light-years, while the Hubble close-up of the galaxy's central region is about 70,000 light-years wide. The sharp image shows details in the distant galaxy's blue star clusters and dust lanes along magnificent spiral arms, and a bright core dominated by yellowish starlight. Still, the individual stars seen in the picture are all in the relatively close foreground, well within our own galaxy. The brighter Milky Way stars show noticeable crosses, or diffraction spikes, caused by the telescope itself.
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Old 07-7-2013, 10:23 AM   #597
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
July 7, 2013
-When the stars begin to come out these evenings, the Big Dipper hangs straight down from its handle high in the northwest, while the dim, elusive Little Dipper stands straight up on its handle from Polaris in the north.

-When Opportunity left Earth on July 7, 2003, many observers expected the rover to survive no more than a few months on the hostile surface of Mars. Ten years later, Opportunity is still going strong and could be poised to make its biggest discoveries yet at a place named Solander Point.

-Behemoth sunspot AR1785 is undergoing a metamorphasis, changing shape by the hour as it turns toward Earth. In less than 24 hours, AR1785 has stretched and lengthened by more than 40,000 km. It is now more than 11 times as wide as Earth, which makes the active region an easy target for backyard. This movie from NASA's Solar Dynamics Observatory shows the action on July 6-7:



Astro Picture of the Day:
July 7, 2013


Source:
In this beautiful celestial still life composed with a cosmic brush, dusty nebula NGC 2170 shines at the upper left. Reflecting the light of nearby hot stars, NGC 2170 is joined by other bluish reflection nebulae, a compact red emission region, and streamers of obscuring dust against a backdrop of stars. Like the common household items still life painters often choose for their subjects, the clouds of gas, dust, and hot stars pictured here are also commonly found in this setting - a massive, star-forming molecular cloud in the constellation of the Unicorn (Monoceros). The giant molecular cloud, Mon R2, is impressively close, estimated to be only 2,400 light-years or so away. At that distance, this canvas would be about 15 light-years across.
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Old 07-7-2013, 12:11 PM   #598
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Default Re: Terry's Astronomy Thread.

I just wanted to say I love this thread. Beautiful pictures and information.
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Old 07-8-2013, 05:33 AM   #599
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Default Re: Terry's Astronomy Thread.

Thanks for the compliment DarkAngelKanna Glad you enjoy the thread.

What's in the sky tonight?
July 8, 2013
-This is the time of year when, as twilight fades to dark, the two brightest summer stars, Arcturus and Vega, shine equally close to the zenith (depending on where you are). Arcturus is the one toward the southwest; Vega is toward the east.

-New Moon (exact at 3:14 a.m. on this date EDT).

Colossal sunspot AR1785 is now directly facing Earth. The active region has a 'beta-gamma-delta' magnetic field that harbors energy for X-class flares, yet so far the sunspot has been mostly quiet. Could it be the calm before the storm? NOAA forecasters estimate a 55% chance of M-flares and a 10% chance of X-flares on July 8th. Solar flare alerts: text, voice.

Sprawling more than 11 Earth-diameters from end to end, AR1785 is one of the biggest sunspots of the current solar cycle. Christian Viladrich of Nattages, France, used a filtered 14-inch Celestron telescope to take this picture. All those irregular blobs surrounding the primary dark core are boiling granules of plasma as small as the state of California or Texas.



Astro Picture of the Day:
July 8, 2013


Source:
Pluto's newly discovered moons now have names. Known previously as P4 and P5, the International Astronomical Union has now given the fourth and fifth discovered moons of Pluto the names Kerberos and Styx. The small moons were discovered in 2011 and 2012 by the Hubble Space Telescope in preparation for the close passing of the New Horizons spacecraft by Pluto in 2015. Keberos is named for the many headed dog in Greek mythology that guards the entrance to the underworld, while Styx is named for the goddess who overlooks the mythological river that runs between the Earth and the underworld. Both monikers are related to the name of Pluto, who rules the mythical nether region. Because their reflectively is unknown, the size of each moon is quite uncertain - but each is crudely estimated to be about 20 kilometers in diameter. The robotic New Horizons spacecraft is on schedule to pass by Pluto in 2015 and provide the first clear images of the dwarf planet and its companions.
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Old 07-9-2013, 05:33 AM   #600
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Default Re: Terry's Astronomy Thread.

What's in the sky tonight?
July 9, 2013
-If you have a dark enough sky, the Milky Way forms a magnificent arch high across the eastern sky after nightfall. It runs all the way from below Cassiopeia in the north-northeast, up and across Cygnus and the Summer Triangle in the east, and down past the spout of the Sagittarius Teapot in the south.

-Astrophotographer Thierry Legault is known for his razor-sharp images of spacecraft. Yesterday, for a change of pace, he photographed a razor-sharp crescent.

"This image shows the tiny lunar crescent at the precise moment of the New Moon, in full daylight at 7h14min UTC on July 8 2013," says Legault. "It is the youngest possible crescent, the age of the Moon at this instant being exactly zero."

"From the shooting site in Elancourt, France, the angular separation between the Moon and the Sun was only 4.4° (nine solar diameters)," he continues. "At this very small separation, the crescent is extremely thin (a few arc seconds at maximum) and, above all, it is drowned in the solar glare, the blue sky being about 400 times brighter than the crescent itself in infrared and probably more than 1000 times brighter in visible light. In order to reduce the glare, the images have been taken at near-infrared wavelengths using a pierced screen placed just in front of the telescope to block direct sunlight."



Astro Picture of the Day:
July 9, 2013


Source:
Supergiant star Gamma Cygni lies at the center of the Northern Cross, a famous asterism in the constellation of the Swan (Cygnus). Known by the proper name Sadr, the bright star also lies at the center of this gorgeous skyscape, featuring a complex of stars, dust clouds, and glowing nebulae along the plane of our Milky Way galaxy. The field of view spans over 3 degrees (six Full Moons) on the sky and includes emission nebula IC 1318 and open star cluster NGC 6910. Left of Gamma Cygni and shaped like two glowing cosmic wings divided by a long dark dust lane, IC 1318's popular name is understandably the Butterfly Nebula. Above and slightly left of Gamma Cygni, are the young, still tightly grouped stars of NGC 6910. Some distance estimates for Gamma Cygni place it at around 750 light-years while estimates for IC 1318 and NGC 6910 range from 2,000 to 5,000 light-years.
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