Greetings, fellow SkyWatchers… It’s New Moon weekend and what better way to celebrate than to fly with the Swan and the Eagle?! While we’re out, we’ll drop by the Trifid, check into this week’s upcoming meteor shower activity and take a challenging walk into the world of dark nebula. Are you ready? Then it’s time to head out into the night… Together.
Friday, August 29, 2008 – While we’ve got a great dark skies night on our hands, it’s a perfect opportunity for all optics to hunt down a star forming region about a palm’s width north of the lid star (Lambda) in the Sagittarius teapot as we seek out the “Omega”…
Often known as “The Swan,” M17 will appear as a huge, glowing check mark or ghostly “2” in the sky – but power up if you use a larger telescope and look for a long, bright streak across its northern edge with extensions to both the east and north. While the illuminating stars are truly hidden, you will see many glittering points in the structure itself and at least 35 of them are true members of this region, which spans up to 40 light-years and could form up to 800 solar masses. It is awesome…
Now let’s continue our nebula hunt as we head about a fingerwidth north and just slightly west of M8 for the “Trifid”…
While M20 is a very tough call in binoculars, it is not impossible with good conditions to see light from an area which left its home nearly a millennium ago. Even smaller scopes will pick up the round, hazy patch of both emission and reflection, but you will need aversion to see the dark nebula which divides it; this was cataloged by Barnard as B 85. Larger telescopes will find the Trifid as one of the very few objects that actually appears much in the eyepiece as it does in photographs – with each lobe containing beautiful details, rifts and folds best seen at lower powers. Look for its cruciform star cluster and its fueling multiple star system while you enjoy this triple treat tonight!
Tonight is New Moon and while the darkest skies are on our side, we’ll fly with the “Eagle” as we hop another fingerwidth north of M17 to M16 (RA 18 18 48 Dec -13 49 00) and head for one of the most famous areas of starbirth, IC 4703…
In small to mid-sized telescopes, the cluster of around 20 brighter stars comes alive with a faint nebulosity that tends to be brighter in three areas. For larger telescopes, low power is essential. With good conditions, it is very possible to see areas of dark obscuration and the wonderful notch where the “Pillars of Creation” are located. Immortalized by the Hubble Space telescope, they won’t be nearly as grand or as colorful as the HST saw them, but what a thrill to know they are there!
Sunday, August 31 – Tonight we will begin entering the stream of the Andromedid meteor shower, which peaks off and on for the next couple of months. For those of you in the northern hemisphere, look for the lazy “W” of Cassiopeia to the northeast. This is the radiant – or relative point of origin – for this meteor stream. At times, this shower has been known to be spectacular, but let’s stick with an accepted fall rate of around 20 per hour. These are the offspring of Biela’s Comet, one that split apart in 1846 leaving radically different streams – much like 73/P Schwassman-Wachmann in 2006. These meteors have a reputation for red fireballs with spectacular trains, so watch for them in the weeks ahead.
While there’s still no Moon to interfere with the dark – let’s take another, more challenging, look at the “dark” as we head toward open cluster NGC 6520…
Located just slightly more than a fingerwidth above Gamma Sagittarii and 5500 light-years away, NGC 6520 (RA 18 03 24 Dec –
While both NGC 6520 and B 86 are about the same distance away, they don’t reside in the hub of our galaxy, but in the Sagittarius Spiral Arm. Seen in binoculars as a small area of compression, and delightfully resolved in a telescope, you’ll find this cluster is on the Herschel “400” list and many others as well. Enjoy this rare pair tonight!
This week’s awesome images are: M17 – Credit: Hillary Mathis, N.A.Sharp, REU program/NOAO/AURA/NSF, M20 – NOAO/AURA/NSF, Yohkoh – Credit: NASA, M16 – Credit: Bill Schoening/NOAO/AURA/NSF and NGC 6520 and B 86 – Credit: Palomar Observatory, courtesy of Caltech. Thank you!!
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