Basel 3 (Markarian 50, Biurakan 3) Open Cluster in Cepheus

Located at: RA 23 hours 15 minutes 12 seconds, Dec +60 degrees 28 minutes 00 seconds

Size: 5.0' (2.0') Magnitude: 8.5 Class: III 1 p n

North is up

West to the right


8" f5 Newtonian reflector


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


Lumicon Red filter, 240 minutes (24 x 10 minute subs), 09/5/6/2008; seeing 1.8-3.3 FWHM per CCDStack


CCDStack 1.3.7, Photoshop 7.0


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

Notes: This cluster is listed as Markarian 50 in 'Star Clusters', by Brent Archinal and Steven Hynes. Its size is given as 2.0', containing 39 stars. Megastar v5.0.12 gives the size as 5.0', containing 5 stars. A CDS Simbad inquiry lists at least 30 members ... In any case, the object is located in the center of this image. The Classification III 1 p indicates "No concentration towards center, Small range in brightness, Less than 50 stars". The "n" in the Classification is for the Bright Nebula LBN 540 (about 60' x 40'), which my image shows only a small portion