M 18 (NGC 6613, Lund 826) Open Cluster in Sagittarius
Located at: RA 18 hours 20 minutes 00 seconds, Dec -17 degrees 06 minutes 00 seconds
Size: 9.0' (7.0'); Magnitude: 6.9; Class: II 3 p n
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 4.56 |
| Image: |
Lumicon Deep Sky filter, 150 minutes (15 x 10 minute subs), 09/13/2007 |
| Processing: |
CCDStack 1.3, Photoshop 7.0 |
| Location: |
Rolling Roof Observatory, Thousand Oaks, CA 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 7.0 arc
minutes. From the NGC / IC Project: Contemporary Visual Observation(s) for NGC 6613 NGC 6613 = M18 18 19 58.5 -17 06 07 V = 6.9; Size 9 17.5": at 100x, bright, scattered, includes three mag 9 stars and 10 mag 11 stars. The bright stars form a "V" asterism with the vertex to the NNE. Includes a few wide double stars. At 220x, 40 stars are visible in a 7' diameter, scattered but distinctive. The bright group of 15 stars forming the "V" asterism are surrounded by a dark circular void. The rest of the cluster is to the S and W of the "V". Only a few faint stars are involved and the cluster appears fully resolved. - by Steve Gottlieb |