|NGC 6558: Globular Star Cluster (Sagittarius) RA: 18h 10.3m / DEC: -31° 45'.8|
Instrument: 10-inch Starfinder
If you slew about 2.2 degrees southeast from 3.6 magnitude Alnasl, the star at the tip of of the spout in Sagittarius, you'll find NGC 6558. This 8.6 magnitude globular star cluster covers an 2' diameter area in my 10-inch. The sketch at left renders a 190X view in the f/4.5 Newtonian reflector. None of the cluster members are resolved. There is the subtlest hint of an elongated brighter portion running roughly northeast to southwest through the general diffuse glow. A 13th magnitude GSC star stands at the northwest edge. Another 45 stars frame the view.
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Revised: July 2, 2003 [WDF]