Terry's Astronomy Thread.

[Bluearrowll]

Daily Suspicious0bserver's Weather Post:
October 15, 2014

What's in the sky tonight?
October 15, 2014

-This Sunday, Oct. 19th, Comet Siding Spring will pass only 140,000 km from Mars. The encounter is so close, the atmosphere of the comet could brush against the atmosphere of the planet. Will this spark auroras on Mars? A video below from NASA weighs the odds of some very strange space weather.

-Last-quarter Moon (exactly so at 3:12 p.m. Eastern Daylight Time). The Moon rises around midnight tonight, below Gemini. By early dawn on Thursday the 16th it's very high in the south — with Pollux and Castor above it, Procyon to its lower right, and bright Jupiter shining farther to its lower left.

Astro Picture of the Day:
October 15, 2014

Source:
What is that changing object in a cold hydrocarbon sea of Titan? Radar images from the robotic Cassini spacecraft orbiting Saturn have been recording the surface of the cloud-engulfed moon Titan for years. When imaging the flat -- and hence radar dark -- surface of the methane and ethane lake called Ligeia Mare, an object appeared in 2013 just was not there in 2007. Subsequent observations in 2014 found the object remained -- but had changed! The featured image shows how the 20-km long object has appeared and evolved. Current origin speculative explanations include bubbling foam and floating solids, but no one is sure. Future observations may either resolve the enigma or open up more speculation.