NGC 2311 (Lund 276, Cr 123) Open Cluster in Monoceros
Located at: RA 06 hours 57 minutes 48 seconds, Dec -04 degrees 36 minutes 42 seconds
Size: 6.0' (7.0'); Magnitude: 9.6; Class: III 2 m
North is up
West to the right
| Telescope: |
8" f5 Newtonian reflector |
| Camera: |
ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56 |
| Image: |
Red (Hoya 25A) filter, 100 minutes (10 x 10 minute subs), 03/13/2007 |
| Processing: |
CCDStack 1.1, 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 2311 NGC 2311 = Cr 123 = OCL-553 = Lund 276 06 57 48 -04 36.7 Size 7 17.5": three dozen stars mag 11-15 in 5'x2' region elongated ~N-S. Fairly rich though no dense spots. Most stars form a thin isosceles triangle with the vertex star mag 13 at the N end, although the brightest star is a wide double 2' ESE of the vertex. From the base of the triangle a stream heads SE and then E from the cluster mixing with some brighter field stars. The cluster includes a few close faint double stars. - by Steve Gottlieb |