NGC 6633 (Lund 834, Cr 380) Open Cluster in Ophiuchus
Located at: RA 18 hours 27 minutes 13 seconds, Dec +06 degrees 30 minutes 37 seconds
Size: 27' (20'); Magnitude: 4.6; Class: III 2 m
North is up
West to the right
| Telescope: |
8" f5 Newtonian reflector |
| Camera: |
ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.54 |
| Image: |
Red (Hoya 25A) filter, 100 minutes (10 x 10 minute subs), 08/4/2006 |
| Processing: |
MaxIm DL 4.56, CCDStack 1.1, Photoshop 7.0 |
| Location: |
Rolling Roof Observatory, Thousand Oaks, California 91360 (+34d 13m 29s -118h 52m 20s) |
| Notes: |
According to "Star Clusters", by Brent Archinal
and Steven Hynes, the size of this open cluster is 20 arc
minutes.
From the NGC / IC Project: Contemporary Visual Observation(s) for NGC 6633 NGC 6633 = Cr 380 = Mel 201 = Lund 834 18 27 15 +06 30.5 V = 4.6; Size 27 13.1": very bright, very large but loose and scattered. At 62x, 150 stars are visible in a 60' field with several bright stars on the SW side and many bright stars are outside this field including mag 5.5 SAO 123516 15' SSE. This is a naked-eye open cluster in dark skies. - by Steve Gottlieb |