NGC 7788 (Cr 459, OCL-275.0) and NGC 7790 (Cr 461, OCL-276.0) Open Clusters in Cassiopeia

Center of field at Approximately: RA 23 hours 58 minutes 25 seconds, Dec +61 degrees 12 minutes 42 seconds

Size: 9.0' (4.0') and 17' (5.0') Magnitude: 9.4 and 8.5 Class: I 2 p and II 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 4.56

Image:

Lumicon Red filter, 300 minutes (30 x 10 minute subs), 10/9/10/2008; seeing 2.3-4.2 FWHM per CCDStack

Processing:

CCDStack 1.3.7, Photoshop 7.0

Location:

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

Notes:

NGC 7788 to the northwest (upper right), NGC 7790 to the southeast (lower left). Two and three of 6 open cluster in a line ... see Berkeley 58.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of NGC 7788 is 4.0 arc minutes, and the size of NGC 7790 is 5.0 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 7788

NGC 7788 = OCL-275 = Cr 459 = Lund 1052 = C 2354+611
23 56 46 +61 24.0
Size 9

18" (11/26/03): fairly small, 4' rich clump of roughly two dozen stars.  
Includes a mag 9.7 star (SAO 20947) on the west side.  Several other mag 10 
stars are scattered nearby but the cluster still stands out fairly well in a 
rich milky way star field.  N7790 is situated 16' SE.

13" (9/29/84): about a dozen mag 12-14 stars over haze in a 1.5' diameter.  
Includes a single bright star mag 9.3 SAO 20947 on the west edge.  This is a 
small but distinctive group in a very rich field.  Situated within a string of 
open clusters with N7790 and Harvard 21.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 7790
NGC 7790 = Cr 461 = OCL-276 = Lund 1054 = C 2355+609
23 58 24 +61 12.5
V = 8.5;  Size 17

18" (11/26/03): ~30 stars resolved in a 4.5'x2.5' region, fairly rich.  Three 
mag 11 stars are along the west side of the cluster and a slightly brighter mag 
10 star is ~4' SE of the main group.  This cluster is slightly larger than N7788 
~16' NW.

13" (9/29/84): largest of three open clusters on a line.  Roughly two dozen 
stars mag 10-15 are resolved in a 5'x2' region elongated E-W.  A mag 10 star is 
about 4' SE of the center and a couple of similar stars are on the west side of 
the cluster.  The slightly fainter cluster N7788 is located 15' NW.  The three 
clusters span about 1 including Harvard 21.

- by Steve Gottlieb