8" f5 Newtonian reflector

 ST-8XME, self-guided, binned 1x1, temp -10c & -15c, camera control MaxIm DL 4.56

Lumicon Red filter, 910 minutes (91 x 10 minute subs), 09/5/6/7/8/9/2011; seeing 2.5-4.6 FWHM per CCDStack

CCDStack 2.24.4110.20701, Photoshop CS 5.1

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

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of the open cluster is 20 arc minutes.

From the NGC / IC Project:

NGC 7380 = Sh 2-142 = LBN 511 = Cr 452
22 47 21 +58 07.9
V = 7.2;  Size 25x30

17.5" (10/30/99): at 100x with an OIII and UHC filter, a bright triangular-
shaped nebulosity (Sh2-142), 8'-10' diameter, is superimposed on a rich grouping 
of stars (N7380) within a rich milky way field.  The brightest mag 8.5 star 
(very unequal double) is at the west vertex. Also a wide strip of nebulosity is 
attached near the SE vertex and extends to the SW.  A dark band appears to 
separate this strip from the triangular patch. The surrounding region appears 
weakly nebulous and the "edge" can be traced with some certainty a ways to the 
north.

17.5" (7/31/92): at 100x, about 40 stars in a 10' diameter.  The brighter stars 
form a "V" or chevron pattern.  The brightest star is at the W tip of the "V" 
and is an unequal double mag 8.6/13.  The cluster appears to be encased in 
nebulosity especially from the mag 8.6 star to the star at the E tip of the "V".  
Using an OIII filter the nebulosity is quite prominent with some structure and 
encases the entire cluster.  A lane of nebulosity oriented SW-NE extends beyond 
the cluster from the star at the E end of the "V" and nebulosity also extends W 
of the mag 8.6 star.  The double star O?480 = 7.6/8.6 at 30" is in the field to 
the W.

13" (10/26/80): ~30-35 stars in a triangular outline, 10'-12' in diameter but 
not rich.

- by Steve Gottlieb