NGC 7031 (Lund 979, Cr 430) Open Cluster in Cygnus

Located at:* RA 21 hours 06 minutes 52 seconds, Dec +50 degrees 51 minutes 00 seconds

Size:* 15' Magnitude: 9.1 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:

Lumicon Red filter, 500 minutes (50 x 10 minute subs), 07/15/16/2011; seeing 2.1-3.1 FWHM per CCDStack

Processing:

CCDStack 2.24.4110.20701, Photoshop 7.0

Location:

 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes:* Seems to be some confusion of the size/position of this open cluster. "Star Clusters", by Brent Archinal and Steven Hynes, has the same data (Comments: "Archinal: Group of 10 brighter stars of this cluster all on NE side ...") as my charting software (Megastar v5.0.12), which I have used in the heading ... The most obvious groping of stars, just northeast (upper left) of the center, is what the CDS and the NGC/IC Project consider the cluster:

Data from the CDS is: RA 21h 07m 12.8s, +50d 52m 55s, which is the position of the 'bright' star of the obvious group northeast of center.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 7031
NGC 7031 = Cr 430 = Lund 979 = OCL-210
21 07 12 +50 51
V = 9.1;  Size 5

17.5": at 220x, about two dozen stars mag 11-15 in a 6' diameter.  At the E edge 
is close double star 11.4/11.8 with a third mag 11.5 star close SW.  A nice 
string of stars is along the N side extending NW from the trio including a close 
double star 12/13 1' N.  A mag 11 star is on S side but the rest of the stars 
are mag 13-15.  Not very rich but stands out in a rich field.  The cluster is 
fairly scattered except for this region with brighter stars.  At 410x, used 
sequence of magnitudes in Clark's Visual Astronomy to positively identify a 
faint V = 16.1 star and suspected a V = 16.3 star.

- by Steve Gottlieb
The Dark Nebula partially captured to the Southwest (lower right) is LDN 1000 (from the CDS)