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December 2006
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Carpe Noctem - Seize the Night!



Image courtesy of Dr. Tyler Nordgren and his students.

ORION

Eight stars pin
his frame
to the night.

He lies just above
the trainyard,
almost ready
to rouse.

Not quite yet.

Eight silent silver bells
take all evening
to stand
just as our star
fades him
back to sky.

Lauren Gunderson



Orion, seen from Hubble and Spitzer Space Telescopes. Image credit: NASA/JPL-Caltech/STScI (infrared, ultraviolet and visible-light colors)

Listener Feedback

From Ted - "I'd like to suggest a great book that I stumbled across at Barnes & Noble about 18 months ago. It is called "The Next Step, Finding and Viewing Messier's Objects." It was written by Ken Graun. The main part of the book is a section about the Messier Object. There are 2 pages per object. It has a little history and notes from Messier's original description. It gives the coordinates and a reference to it's location on star maps included in the book. What really sets this book apart is that it includes pictures taken by the author thru a 4 inch scope. It allows you to see exactly what you are looking for. The book also has a biography of Charles Messier, and a few general tips on astronomy. The book it not very large so it is easy to carry with you. I find the book extremely helpful to show people what they are looking for before they step up to the eyepiece. I hope you can find the book to review and recommend it on a future podcast. "

Don has another book suggestion: "A great book for gifts is "There Once Was a Sky Full of Stars", by Bob Crelin. Great for helping children (and adults) learn about the effects of light pollution."

Special Thanks!

Woodland Hills Camera and Telescope for helping our club buy a PST for use with our club outreach!
Just a reminder, Woodland Hills Camera and Telescope is offering a 5% discount for any AAGG listener! Just put "AAGG" in the discount code box at checkout to receive your discount.

Holiday lights in the sky - Stellar Spectrum

Class Temperature Star colour Mass Radius Luminosity Hydrogen lines Examples
O 30,000 - 60,000 K Bluish ("blue") 60 15 1,400,000 Weak 10 Lacerta, Zeta Puppis, Lambda Orionis
B 10,000 - 30,000 K Bluish-white ("blue-white") 18 7 20,000 Medium Rigel, Spica, the brighter Pleiades
A 7,500 - 10,000 K White with bluish tinge ("white") 3.2 2.5 80 Strong Vega, Sirius
F 6,000 - 7,500 K White ("yellow-white") 1.7 1.3 6 Medium Canopus, Procyon
G 5,000 - 6,000 K Light yellow ("yellow") 1.1 1.1 1.2 Weak Sun, Capella
K 3,500 - 5,000 K Light orange ("orange") 0.8 0.9 0.4 Very weak Arcturus, Aldebaran
M 2,000 - 3,500 K Reddish orange ("red") 0.3 0.4 0.04 Very weak Betelgeuse, Antares

Mnemonics for the Harvard Spectral Classification Scheme
Official Bureaucrats At Federal Government Kill Many Researchers' National Support
Only Boring Astronomers Find Gratification Knowing Mnemonics!
Oh, Bring A Fully Grown Kangaroo My Recipe Needs Some!
Oh Backward Astronomer, Forget Geocentricity; Kepler's Motions Reveal Nature's Simplicity.
Oh Bother, Astronomers Frequently Give Killer Midterms

Sun

sunspots

Planets





Evening Planets
  • Venus - Mag -3.8 in Sagittarius but currently lost in the Sun's glare.
  • Neptune - Mag +7.9 in Capricorn will also be better for dark evenings and is less than 1 degree north of the +4.3 magnitude star Iota Capricorni
  • Uranus - Mag +5.9 in Aquarius Uranus is best seen in a dark moonless sky away from artificial lighting. It may be seen looking like a very faint star to the dark-adapted naked eye that shimmers in and out of visibility just under 1 degree east of Lambda Aquarii. Find the tipped over letter Y of Aquarius, go 4 thumbwidths southeast to find Lambda, and then a smidgen Southwest.
  • Saturn - Mag 0.4 on the western edge of Leo just west of Regulus. An easy catch!


Morning Planets
  • Jupiter - Mag -1.6 in Scorpius visiable very low on the ESE horizon an hour before sunrise. Finally had a clear horizon before the storm hit and it was very bright and yes, low and south.
  • Mars - Mag 1.5 just barely above the Sun's glare between the Sun and Mercury
  • Mercury - Mag -0.5 barely off the horizon moving quickly towards the sun. Use the bright orange/red Arcturus and "spike" almost horizontally South to Spica. Mercury sits 25 degrees ESE of Spica.
  • Saturn - Mag 0.4 on the western edge of Leo preceeding Regulus. Saturn is slowly inching its way towards Cancer

Constellations



Time for a quiz! Fornax - the Furnace - Invented by Lacaille during his stay at the Cape of Good Hope in 1751 - 1752 (who else!)

Viewing

Naked eye and binoculars - the Pleiades


Mentioned by Homer about 750 B.C.At least 6 member stars are visible to the naked eye,

-the Hyades At a distance of only about 150 light years, the Hyades form one of the nearest open cluster to Earth.



Greek mythology, nymphs; daughters of Atlas and Aethra. They cared for both Zeus and Dionysus as infants. In recognition of these services, they were placed among the stars of the constellation Taurus, where their rising and setting corresponded to the rainy seasons.

Aldebaran (Alpha Tauri), the bright red star, is not a member of the cluster and situated much closer to us (about 60 light years, a factor 2.5 closer than the Hyades).

Telescope -

Northern Hemisphere chart You can use Taki's chart #14, chart 72 in the Pocket Sky Atlas NGC 7380 bright irregular open cluster, 7.2 mag, with bright nebulosity around. Once edge looks scalloped.
NGC 7510- the "Little Piggy" cluster (Alice's name only) in Cephus 7.9 wedge or trapazoid shaped open cluster. Right across the boarder from...
M52 - evil dustbunny cluster, 6.9 open cluster in Cassiopeia
and just a few degree towards Polaris from Caph (beta Cassiopeia) is NGC 7790

Gifts for the Astronomer!

Do it yourself (DIY) gifts
There are so many creative things you can do for your astronomer, or for yourself, that won't cost and arm and a leg! Consider the following:
  • "Rite in the Rain" paper - perfect for creating your own lists without having to pull them in and out of sheet protectors.
  • Hats, scarves, mitten (especially with flaps so you have finger access)
  • Renovate an old hard sided Samsonite style suitcase for observing! Paint it and find some nice foam padding for the inside.
  • Cold weather observing 'basket' - Be Creative!! a good thermos, hot cocoa, snacks, handwarmers, and maybe a favorite CD all 'wrapped' in a new accessory case
  • Warm weather observing 'basket' - Have Fun!! snacks, a nice wide brim hat, some new shades, Miracool bandana, some oil free sunscreen and bug spray, all 'wrapped' in a Pelican case
  • Online Star Atlases - print them out, put them in protective sleeves, laminate them or print them on waterproof paper and bind them into a book that will open flat!
  • Fraser Cain at Universe Today emailed to let me know that there will be a "What's up 2007" so keep an eye on his site!
  • My favorite give-away Messier Telrad Charts - by John Small courtesy of the Amateur Telescope Makers of Boston.
  • Messier Telrad Charts - From Utah Skies
  • Caldwell Telrad Charts - From Utah Skies
For the woodworkers out there...

Binocular Mounts
Observing Chair - example or the Cats Perch Plans

On to the shopping...
Telescope accessories

Woodland Hills Camera and Telescope is offering a 5% discount for any AAGG listener! Just put "AAGG" in the discount code box at checkout to receive your discount.

Off the scope

References
Atlases
Planisphere
Books
...there are just toooo many but here is a start....
Reader suggested books!

Comets

Comets for the Month.

Check out the Sky Hound site.
"One touch of nature makes the whole world kin"
-- Shakespeare

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Direct download: AAGGshow34.mp3
Category:Stars -- posted at: 12:04 AM