Auburn Astronomical Society E-Newsletter
In this Issue
This monthís meeting will be on Friday, December
1, at 8:00PM in room 215 of the Aerospace
Riders from the Montgomery area are welcome to
meet at the home of
Russell Whigham, 518
Seminole Dr., and carpool over to Auburn. Plan to be ready
to leave for Auburn at 7:00PM.
Our dark-sky star party this month will be on
Saturday, December 16, at Cliff
Hillís farm, clouds permitting of course.
December 1, December meeting
Glynn Alexander called to report several hours
of successful observation of the transit. Your editor took his filtered
ST80 to work, hoping to steal a glance as time permitted. Alas, time
did not permit use of the scope. When I stepped outside with only
the solar ďSunĒ glasses, I suddenly realized how egregiously I had over
estimated the size of Mercuryís disk against the Sun.
December 3, Lunar occultation of the Pleiades
December 4, Earliest end of evening twilight
December 7, Earliest sunset
December 16, December star party at Cliff
December 21, Winter Solstice -- shortest
January 5, January meeting
January 13, January star party at Cliff
April 19-22, Georgia Sky View 2007
Scott Thompson hurried home from work and barely
caught the event as the Sun slid into the trees. Here is Scott's
image of the transit of Mercury.
Robert Rock called to explain why he has
missed attending recent AAS meetings. Robert is engaged to be married
and has been distracted lately. Congratulations, Robert!
For Sale: Celestron C-8. Robert
Free to a good home: 10 years worth of
magazines. Scott Thompson
Sale on some new telescopes: Syd Spain
I found us a new
dark sky site. It will be a long drive but imagine the views.
method for polar alignment for equatorial mounts:
Man is the best computer we can put aboard a
spacecraft and the only one that can be mass produced with unskilled labor.
-Wernher von Braun, (1912-1977)
Scope steward, Rhon
Jenkins, know if you (members only) would like to have your name added
to the list to borrow either of the loaner telescopes.
Q. Can someone explain why a long exposure
photograph will show more detail than when looking through a scope?
A. The scope's diameter is much larger than
your eye's pupil diameter. In the ratio of (200 mm/6 mm)^2
= 1,100. That's a lot more light. That's 7.6 magnitudes
gain due to aperture. This is called optical gain. Your eye
takes "pictures " with an equivalent exposure time of 1/15 second. An imager
typically exposes for one hour. The gain in signal is thus (3600/1/15)
= 54,000. That's 11.8 magnitudes fainter than you can see with your eye
through the eyepiece.
Igloo Observatory Home Page http://dpersyk.home.att.net
Hoping to see everyone at the meeting and the