Greetings, fellow SkyWatchers! It’s an awesome weekend forecast for many of us attending Fall Star Parties, and all over the world we’re looking forward to moonless nights and the fellowship with our brother and sister amateur astronomers. If you’ve never been to a star party, try the Goggle pages for information… you just might find one going on near you! In the meantime, let’s have us a “Snowball” fight, chase some galaxies and ponder double stars! I’ll see you in the night…
Friday, September 18, 2009 – One of the most interesting features of the autumn sky is how slowly the stars and constellations seem to proceed across the heavens. This is only an illusion, since skydark arrives earlier each night (after summer solstice in the Northern Hemisphere), making the progress of the constellations across the sky seems to ‘‘freeze.’’ Tonight, Capella can be seen rising to the northeast just as Antares settles southwest. Four planets—Jupiter, Pluto, Neptune, and Uranus—are still above the horizon, with Jupiter now very low to the west-southwest. Descending to the northwest is Ursa Major, the ‘‘Big Dipper.’’ Across the sky is Piscis Austrinus, and lonely but bright Fomalhaut is beginning its rise. Seven stars of the first magnitude now grace the heavens. Against this backdrop, one of the darkest skies of the month is now upon us. It’s the New Moon…
Let’s have a look at another fine planetary nebula—NGC 7662. At 9 magnitude, this one is more commonly known as the ‘‘Blue Snowball’’ and can be found about three finger-widths east of Omicron Andromedae, or a little less than a handspan northwest of Alpha Pegasi (RA 23 25 54 Dec +42 32 06).
Similar in size to M57, even low power with a small scope easily reveals the planetary nature of this very fine study. Power up and you’ll discover that the annulus of this roughly circular planetary is definitely brighter inside than out. Large telescopes will highlight NGC 7662’s blue coloration and reveal a bright inner globe surrounded by a faint outer ring.
Saturday, September 19, 2009 – On this date in 1848, William Boyd was observing Saturn and discovered the planet’s eighth moon, Hyperion. If you’re out before sunset, some lucky stargazers are going to discover that the slender crescent Moon is about to occult Mercury! Check the Resources in this book and IOTA for locations and dates. Then check them both out in binoculars!
Would you like to try for another pair? Then wait until the skies are fully dark and head north for a galaxy and cluster pairing—NGC 6946 (RA 20 34 51 Dec +60 09 18) and NGC 6939 (RA 20 31 30
Dec +60 39 42).
Located in western Cepheus, you’ll find them about a finger-width southwest of Eta.
Enjoy your weekend!!
This week’s awesome images (in order of appearance) are: NGC 7662 (credit—Adam Block/NOAO/AURA/NSF), NGC 6946 and NGC 6939 (credit—Palomar Observatory, courtesy of Caltech), Crater Humboldt (credit—Ricardo Borba) and Beta Lyrae (credit—Palomar Observatory, courtesy of Caltech). We thank you so much!!
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