NGC 7039 (Lund 981, Cr 431) Open Cluster in Cygnus
Located at: RA 21 hours 11 minutes 12 seconds, Dec +45 degrees 39 minutes 00 seconds
Size: 24' (15'); Magnitude: 7.6; Class: IV 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: |
Lumicon Red filter, 600 minutes (60 x 10 minute subs) 07/22/23/27/2010; seeing 2.1-3.2 FWHM per CCDStack |
| Processing: |
CCDStack 2.9.3831.24373, Photoshop 7.0 |
| Location: |
Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s) |
| Notes: | Comments from "Star Clusters", by Brent
Archinal and Steven Hynes; "Archinal: 7' high by 14 wide group of
stars. brightest star on NNE side". According to "Star Clusters",
the size of this open cluster is 15 arc minutes. Imaged this object, Basel 12 and NGC 7093, while to moon was near full ... all within 6 or 7 degrees of "The Wall" / Mexico section of NGC 7000 (North America Nebula). From the NGC / IC Project: Contemporary Visual Observation(s) for NGC 7039NGC 7039 = Cr 431 = Lund 981 = OCL-203 21 10.8 +45 37 V = 7.6; Size 25 17.5": about 125 stars in a 15'-20' diameter. This is a very large, rich triangular group. Two bright mag 7.5 stars are at the SSW and NNE ends. Also two mag 9 stars are involved. Very rich in mag 12-13 stars. Pretty uniform cluster with a sprinkling of brighter stars. Excellent low power milky way field using a 20mm Nagler. - by Steve GottliebHistorical Research Notes / Correction for NGC 7039 NGC 7039 is a very large cluster about 20 arcmin long and 7 arcmin wide. Though JH says it is "Extended from nf to sp," it is actually extended from the southwest (sp) to the northeast (nf). I suspect this is a simple error on JH's part, though visual observers might want to have a look at the cluster to be sure. The position that JH gives is for SAO 50547 on the northeastern edge of the cluster. On POSS1, DSS, and GSC, there are two overlapping concentrations of stars within the cluster. The position in the main table is for a point midway between the centers of these concentrations. - Dr. Harold G. Corwin, Jr. |