Stephenson 1 (Lund 870, OCL-137) Open Cluster in Lyra

Located at: RA 18 hours 53 minutes 36 seconds, Dec +36 degrees 55 minutes 00 seconds

Size: 20' (40') Magnitude: 3.8 Class: IV 3 p

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, 100 minutes (10 x 10 minute subs), 07/25/2007

Processing:

CCDStack 1.2, Photoshop 7.0

Location:

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

Notes: This field was a real problem to process ... This nondescript cluster is also known as the Delta Lyrae cluster, and the very bright star is Delta 2 (12 Lyrae), at 4.3 (visual) magnitude. In my on going attempts to take advantage of every 'clear' night, I tried this object with a very hazy sky (about magnitude 4 skies visible in the area of Vega), and the 11 day old moon lighting up the sky to the south. The area around Delta  was illuminated beyond my present ability to adequately process...

According to  "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 40 arc minutes (!). Comments from "Star Clusters" are; "Archinal: Delta Lyrae cluster, discovered by Gordon Grant. Delta 2 is center and brightest star (V=4.30v, M4II). Aliases: Del Lyr cl; Lund 870, OCL 137.0; C1851+368"