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Hangout Schedules Calendar, Index & Updates
Calendar: goo.gl/YodHQc | Index: goo.gl/kLHvSo
House Rules: goo.gl/uXW4Ik | Slack: goo.gl/WF2QlE
Note: Astronomy Cast and the Weeekly Space Hangout are on Summer Hiatus until September!
This post is an overview of the hangouts we keep track on in the calendar and the index page on our website. Links to previous versions of this post are at the bottom. We will now use the comments of this post mainly as a changelog for the calendar and for other hangout-related updates - if you know about an interesting hangout, feel free to comment here or put the event in the Hangouts & Podcasts section!

Weekly Space Hangout
Weekly space news show hosted by +Fraser Cain with a rotating crew of guest journalists. Broadcast usually Fridays at 19:00 UTC.
See +Universe Today for details and announcements.
Youtube Archive Playlist: goo.gl/Kh1VvI

Astronomy Cast Live
Live recording of the podcast with +Pamela L. Gay and +Fraser Cain
Broadcast usually Fridays at 20:30 UTC after the WSH.
See +Astronomy Cast and +CosmoQuest for announcements and updates. Audio Podcast available at www.astronomycast.com.
Youtube Archive Playlist: goo.gl/RCT9DM

Learning Space
Semi-regular hangouts about science and astronomy in education, hosted by +Pamela L. Gay, +Georgia Bracey & +Nicole Gugliucci. On hiatus at the moment.
Schedule: goo.gl/GBjO7a
See +Learning Space and +CosmoQuest for details and announcements.
Youtube Archive Playlist: goo.gl/PYCmsR

Center for Lunar Science and Exploration Hangouts
New hangout series from +CosmoQuest and the +Center for Lunar Science and Exploration, hosted by +Pamela L. Gay.
Youtube Archive Playlist: goo.gl/LpqAHZ

Global Star Party
New semi-regular hangout series with live telescope views and astrophotography discussions. See +Global Star Party for announcements and updates. Unofficial heir of the Virtual Star Party. On hiatus at the moment.
Youtube Archive Playlist: goo.gl/DGYgXe

Deep Astronomy
Weekly hangouts hosted by +Tony Darnell, broadcast usually Thursdays between 19-21:00 UTC
See +Deep Astronomy for updates and announcements
Youtube Archive Playlist: goo.gl/jrFQzz

Astronomers Without Borders Hangouts
Semi-regular hangouts with special guests, hosted by +Mike Simmons. See +Astronomers Without Borders for updates and announcements.
Youtube Archive Playlist: goo.gl/MMdJQj

Previous versions of this post are located here:
» goo.gl/eUjsM8 - July-September 2014
» goo.gl/yN3Lve - September-October 2014
» goo.gl/F7crLo - October-December 2014
» goo.gl/3sHx1I - January-February 2015
» goo.gl/pfNG3j - March 2015 (replaced with Hangoutathon version)
» goo.gl/dIX2wl - March-May 2015 (Hangoutathon version)
» goo.gl/2zigFC - May-August 2015
» goo.gl/ACxFpt - August 2015 II
» goo.gl/AM9PQ4 - August-September 2015 (Summer Hiatus Edition)
» goo.gl/ku1YYu - September 2015 - January 2016 (Changed out for clean comment section)
» goo.gl/ROhy98 - January 2016 - October 2016 (Changed out for clean comment section)
» goo.gl/8FKkFT - October 2016 - July 2017 (Changed out for Summer Hiatus Edition)
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ABSTRACT
Exomoons represent an outstanding challenge in modern astronomy, with the potential to provide rich insights into planet formation theory and habitability. In this work, we stack the phase-folded transits of 284 viable moon hosting Kepler planetary candidates, in order to search for satellites. These planets range from Earth-to-Jupiter sized and from 0.1-to-1.0 AU in separation - so-called “warm” planets. Our data processing includes two-pass harmonic detrending, transit timing variations, model selection and careful data quality vetting to produce a grand light curve with a r.m.s. of 5.1 ppm. We find that the occurrence rate of Galilean-analog moon systems can be constrained to be η <0.38 to 95% confidence for the 284 KOIs considered, with a 68.3% confidence interval of η= 0.16+0.13−0.10. A single-moon model of variable size and separation locates a slight preference for a population of Super-Ios, ∼0.5R⊕ moons orbiting at 5-10 planetary radii. However, we stress that the low Bayes factor of just 2 in this region means it should be treated as no more than a hint at this time. Splitting our data into various physically-motivated subsets reveals no strong signal. The dearth of Galilean-analogs around warm planets places the first strong constraint on exomoon formation models to date.

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Cassini has found carbon chain anions (negative ions), a vital stepping stone to growing larger, more complex organic molecules.
https://phys.org/news/2017-07-cassini-universal-driver-prebiotic-chemistry.html

The scientific paper can be found here:
http://iopscience.iop.org/article/10.3847/2041-8213/aa7851/meta;jsessionid=B2E5DDA56D0B8964D827263EBC14313A.c2.iopscience.cld.iop.org

(I thought I had already posted this, but then could not find it anymore)

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Astronomers May Have Found the First Exomoon

http://flip.it/kCx9JC

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Solar eclipses happen because our Sun & Moon are roughly the same size in appearance. But how big is the Sun actually? Turns out, it's complicated.

https://www.space.com/37611-solar-eclipse-2017-sun-bigger-than-we-think.html

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An automatic observatory managed to look at the spot a gamma ray burst happened last year. They measured significant polarization, which probably means strong magnetic fields.
https://asunow.asu.edu/20170726-discoveries-asu-massive-star-dying-blast-caught-rapid-response-telescopes

Scientific article here, behind paywall.
http://www.nature.com/nature/journal/v547/n7664/full/nature23289.html?foxtrotcallback=true
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