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016_ADS_13442_17-Theta_Sge
ADS 13442 (17-Theta Sagittae)

Poster: cildarith (see all of this user's photos)
Description: Before moving on to our final three deep-sky wonders, slew your scope 3 to the east-southeast and take a look at the fine double star Theta Sagittae (6.5, 9.0; 11.9"; 325). This white and yellow pair with a yellow-orange companion to the southwest lies in a spectacular field of view, which also includes the wide double star South 737 (8.2, 9.6; 100.8"; 129). This latter pair is part of a long straggling string of stars extending east to west that some have speculated as being the "missing" open cluster NGC 6873 (Kepple & Sanner, 1998). Others (NED and the NGC/IC Project) contend the missing cluster is centered about the double star STF 2631, 1m of right ascension to the west. Comparing the view through the eyepiece with discover J. Herschel's description: "a coarse straggling group of stars 1013m, hardly entitled to be called a cluster" I personally find Kepple & Sanner's argument a little more convincing. How do the views compare in your scope? Regardless of NGC 6873's status, Theta Sagittae and its environs are certainly worth a few minutes of eyepiece time.


dddhgg
sage

Registered: 8/3/2007
Posts: 303
Great!
Wed Sep 12, 2007 7:06pm
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