Greetings, fellow SkyWatchers! It’s a dark sky weekend and a great time to get out your binoculars or telescopes and enjoy. Use bright star – Formalhaut – to help you find distant planet Uranus… and the “Great Square of Pegasus” to help you find an even more distant galaxy! Would you like to explore some stellar evolution or did you know Saturn was back in the morning skies? Then check out what’s happening as we head out into the night…
Now let’s head toward the southwest corner star of the Great Square of Pegasus – Alpha. Our goal will be 11th magnitude NGC 7479, located about three degrees south (RA 23 04 56 Dec +12 19 23).
On July 27, 1990, a supernova occurred near NGC 7479’s nucleus and reached a magnitude of 16. When observed in the radio band, there is a polarized jet near the bright nucleus that is unlike any other structure known. If at first you do not see a great deal of detail, relax… Allow your mind and eye time to look carefully. Even with telescopes as small as 8-10″, structure can easily be seen. The central bar becomes “clumpy” and this well-studied Seyfert galaxy is home to an abundance of molecular gas and is actively forming stars. Enjoy the incredible NGC 7479…
Saturday, October 25, 2008 – And who was watching the planets in 1671? None other than Giovanni Cassini – because he’d just discovered Saturn’s moon Iapetus. If you’re up before dawn this morning, have a look at Saturn for yourself as it poses less than five degrees away from the Moon. Iapetus usually holds around a magnitude of 12, and orbits well outside of bright Titan’s path.
Named Sadal Suud (“Luck of Lucks”), this star of spectral type G star is around 1030 light-years distant from our solar system and shines 5800 times brighter than our own Sun. The main sequence beauty also has two 11th magnitude optical companions. The one closest to Sadal Suud was discovered by John Herschel in 1828, while the further star was reported by S. W. Burnham in 1879.
At near magnitude 8, this class V globular cluster is well suited to even binoculars, and becomes spectacular in a telescope. Originally discovered by Messier in August 1764, and resolved by William Herschel in 1783, M30’s most attractive features include the several branches of stars which seem to radiate from its concentrated core region. Estimated to be about 26,000 light-years away, you’ll find it fairly well resolved in large aperture, but take time to really look. The dense central region may have already undergone core collapse – yet as close as these stars are, very few have collided to form x-ray binaries. For the smaller scope, notice how well M30’s red giants resolve, and be sure to mark your notes!
Sunday, October 26, 2008 – If you’re up early, be sure to look for Venus and Antares making a close pairing in the pre-dawn sky!
Tonight it’s time for a telescopic challenge – a compact galaxy group. You’ll find it less than half a degree southeast of the stellar pair 4 and 5 Aquarii (RA 20 52 26 Dec -05 46 19).
Although these four galaxies seem to be in close proximity to one another, no current data suggests any interaction between them. While such a faint galaxy grouping is not for everyone, it’s a challenge worthy of seasoned astronomer with a large scope! Enjoy…
Until next week, ask for the moon – but keep on reaching for the stars!
This week’s awesome images are: Deep Space 1 image of Comet Borrelly – Credit: NASA, Rendition of Lassell’s Telescope (widely used public image), Uranus – Credit: HST/NASA, NGC 7479 – Credit: Palomar Observatory, courtesy of Caltech, Henry Norris Russell (widely used public image), Beta Aquarii – Credit: Palomar Observatory, courtesy of Caltech, M30 – REU program/NOAO/AURA/NSF and Hickson 88 – Credit: Palomar Observatory, courtesy of Caltech. Thank you so much!!
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