Greetings, fellow StarGeezers! It’s Friiiii day… And another great weekend forecast. Does having all this Moon around get you down? It shouldn’t. Where else could you find another world that you could so intimately study detail with even the most modest of telescopes or binoculars? Instead of cursing Luna’s presence, get out your optics and enjoy! While we’re at it, we’ll take a look at some very interesting stars – both in the sky and from planet Earth. It’s time to head out into the dark… Cuz’ here’s what’s up!
Friday, November 7, 2008 – Today in 1996, the Mars Global Surveyor left on its journey. Just 30 years beforehand on this same day, Lunar Orbiter 2 was launched. Tonight let’s launch our way toward the Moon as we begin our observing evening with a look at a far northern crater – J. Herschel.
Residing on the mid-northern edge of Mare Frigoris, this huge, shallow old crater spans 156 kilometers and bear the scars of the years. Look for the deeper and younger crater Horrebow on the southwestern wall – for it has obliterated another, older wall crater.
Ready to aim for a bullseye? Then follow the “Archer” and head right for the bright, reddish star Aldebaran. Set your eyes, scopes or binoculars there and let’s look into the “eye” of the Bull.
As the 13th brightest star in the sky, it almost appears from Earth to be a member of the V-shaped Hyades star cluster, but this association is merely coincidental, since it is about twice as close to us as the cluster is. In reality, Aldebaran is on the small end as far as K5 stars go, and like many other orange giants, it could possibly be a variable. Aldebaran is also known to have five close companions, but they are faint and very difficult to observe with backyard equipment. At a distance of approximately 68 light-years, Alpha is “only” about 40 times larger than our own Sun and approximately 125 times brighter. To try to grasp such a size, think of it as being about the same size as Earth’s orbit! Because of its position along the ecliptic, Aldebaran is one of the very few stars of first magnitude that can be occulted by the Moon.
May his dreams live on..
Now drop south-southwest less than a fistwidth to have a look at something so unusual that you can’t help but be charmed – the UV Ceti System (RA 01 39 01 Dec -17 57 01).
No matter what you choose to look at tonight, as Dr. Sagan would say: “We are all star stuff.”
Have a great week and I’ll see you… Under the stars!
This week’s awesome photos are: Crater J. Herschel – Credit: Wes Higgins, Aldebaran – Credit: Palomar Observatory, courtesy of Caltech, Sinus Iridum – Credit: Wes Higgins, Edmund Halley (widely used public image), The Hyades Star Cluster – Credit: NASA, Carl Sagan (widely used public image), and Chi and the UV Ceti System – Credit: Palomar Observatory, courtesy of Caltech. Our many thanks to you!
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