M 26 (NGC 6694, Lund 858) Open Cluster in Scutum

Located at: RA 18 hours 45 minutes 12 seconds, Dec -09 degrees 23 minutes 00 seconds

Size: 14' (10') Magnitude: 8.0 Class: II 3 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 Deep Sky filter, 150 minutes (15 x 10 minute subs), 09/10/2007

Processing:

CCDStack 1.3, Photoshop 7.0

Location:

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

Notes:

Another Messier open cluster lost in a dense Milky Way field. M 26 is about 3.5 degrees SSW of M 11, on the southern edge of the Scutum Star Cloud.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 10 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6694

NGC 6694 = M26 = Cr 389
18 45 18 -09 23.0
V = 8.0;  Size 15

17.5" (6/30/00): this rich, distinctive cluster stands out well in the field at 
100x.  At 220x, ~60 stars are resolved in a 7' diameter.  A mag 9 star marks the 
SW end.  About a dozen stars are arranged in a striking arc (concave to the 
west) just north of the mag 9 star.  A dark lane oriented N-S bisects the 
cluster just following this star chain and extending past the bright star.  On 
the east side of this lane is a rich group of stars, roughly arranged into two 
irregular ovals.

13": about 40 stars mag 9-14 are resolved in a 7' diameter at 220x.  The 
brightest star is mag 8.8 SAO 142584 at the SW end.  A faint group of mag 13.5-
14 stars is just east of the main section.  Located in a rich field.

8": 20 stars mag 11-13, fairly small.  Consists mostly of faint stars except for 
the four brighter central stars which form a "kite" asterism.  Some dense 
sections of faint stars lie N and S in strings.

- by Steve Gottlieb