Archinal 1* ([KPS2012] MWSC 3021**) Open Cluster in Serpens

Located at: RA 18 hours 54 minutes 48 seconds, Dec +05 degrees 33 minutes 00 seconds

Size: 1.5' Magnitude: -- Class: II 2 p

North is up

West to the right


 14.5" f5 Newtonian reflector


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


Lumicon Red filter, 160 minutes (16 x 10 minute subs), 09/13/2015; seeing 2.1-3.6 FWHM per CCDStack


CCDStack 2.90.5589.16047, Photoshop CS5.1


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


Still trying to take advantage of the moonless south, and still having to dodge monsoonal moisture.

This object (centered) was noticed in Sue French's "Deep-Sky Wonders" column in Sky & Telescope. From September 2015, page 56. Only used one night on this one, but it is in the Milky Way, which accounts for the brightening south (below) of the cluster.

From "Star Clusters", by Brent Archinal and Steven Hynes; Comments and Aliases: "See notes: First listed here, discovered by Archinal. Includes 4 GSC stars, brightest is GSC 00457-00629. Near IC4756."

** From the CDS for this object. Image/data.