Jan
14
Mon
Monthly Meeting @ George Mason University
Jan 14 @ 12:00 am – 2:00 am

Our next speaker is Gideon Bass and he will be speaking on Kepler Studies of Low-Mass Eclipsing

Summary of Upcoming Lecture

KIC 6131659 is a long-period (17.5 days) eclipsing binary discovered by the Kepler mission.  We analyzed six quarters of Kepler data along with supporting ground-based photometric and spectroscopic data to obtain accurate values for the mass and radius of both stars, namely M1=0.922 ± 0.007Msun, R1=0.8800 ± 0.0028Rsun, and M2=0.685 ± 0.005Msun, R2=0.6395 ± 0.0061Rsun.  There is a well-known issue with low mass (M <<0.8Msun) stars (in cases where the mass and radius measurement uncertainties are smaller than two or three percent) where the measured radii are almost always 5 to 15 percent larger than expected from evolutionary models, i.e. the measured radii are all above the model isochrones in a mass-radius plane.  In contrast, the two stars in KIC 6131659 were found to sit on the same theoretical isochrone in the mass-radius plane.  Until recently, all of the well-studied eclipsing binaries with low-mass stars had periods less than about three days.  The stars in such systems may have been inflated by high levels of stellar activity induced by tidal effects in these close binaries.  KIC 6131659 shows essentially no evidence of enhanced stellar activity, and our measurements support the hypothesis that the unusual mass-radius relationship observed in most low-mass stars is influenced by strong magnetic activity created by the rapid rotation of the stars in tidally-locked, short-period systems.  Finally, using short cadence data, we show that KIC 6131657 has one of the smallest measured non-zero eccentricities of a binary with two main sequence stars, where e cos ω = (4.57 ± 0.02) × 10-5.

 

Jan
26
Sat
⚪ Full Moon
Jan 26 @ 9:39 pm – 10:39 pm

January’s Full Moon is the “Old Moon”, “Wolf Moon”, “Ice Moon”, “Moon after Yule”, or “Paush Poornima”

Feb
10
Sun
âš« New Moon
Feb 10 @ 12:21 am – 1:21 am
Feb
11
Mon
Monthly Meeting @ George Mason University
Feb 11 @ 12:00 am – 2:00 am
Monthly Meeting @ George Mason University

Our next speaker is Eric Douglass and he will be speaking on Types of Observable Lunar Craters NOTE: This meeting will be held in the “Showcase Room” which is the meeting room at the base of the Research Hall Observatory instead of the normal location.

 

 

Feb
25
Mon
⚪ Full Moon
Feb 25 @ 1:27 pm – 2:27 pm

February’s Full Moon is the “Snow Moon”, “Hunger Moon”, “Storm Moon”, “Candles Moon” or “Magh Poornima”

Mar
10
Sun
Monthly Meeting @ George Mason University
Mar 10 @ 11:00 pm – Mar 11 @ 1:00 am

Our next speaker is Andrea Jones and she will be speaking on Mars Exploration Missions and Future

 

 

Mar
11
Mon
âš« New Moon
Mar 11 @ 1:52 pm – 2:52 pm
Mar
27
Wed
⚪ Full Moon
Mar 27 @ 3:28 am – 4:28 am

March’s Full Moon is the “Lenten Moon”, “Worm Moon”, “Crow Moon”, “Crust Moon”, “Sugar Moon”, “Sap Moon”, “Chaste Moon”, or “Holi”.

Apr
10
Wed
âš« New Moon
Apr 10 @ 3:36 am – 4:36 am
Apr
14
Sun
Monthly Meeting @ George Mason University
Apr 14 @ 11:00 pm – Apr 15 @ 1:00 am

Guest Speaker: Dr. Gianluca Masi

Next 14 April, starting at 23:15 UT, the Northern Virginia Astronomy Club (NOVAC) will offer you a unique chance to explore cosmic landscapes from the comfort of your chair.

Thanks to a joint collaboration between NOVAC and the Virtual Telescope Project (VT)in Italy (www.virtualtelescope.eu), a powerful telescope in Italy will be capturing in real time images of the most beautiful cosmic gems and will share the view with all those connected from all around the planet.

All this with the live commentary of the astrophysicist Gianluca Masi, PhD, founder and scientific director of the Virtual Telescope Project, who will be available on the event chat for questions and comments.

We will surf the northern Spring skies, spying beautiful, distant galaxies like Messier 51, Messier 100, NGC 4565 and so on, also spying dying stars, exploding supernovae millions and millions of light years away. On our way back home, we will visit planet Saturn and its elegant, amazing rings. Of course, participants can suggest their own preferred destinations via chat, adding interactivity to the trip.

NOVAC and VT will open the online event to all, for free: to join, you just need to access, at the event date and time, the page:www.astrowebtv.org

In case of cloudy weather at the observatory, backup images will be used.

This event is part of the Global Astronomy Month 2013.