Trumpler 3 (Lund 101, Cr 36, Harvard 1) Open Cluster in Cassiopeia

Located at: RA 03 hours 12 minutes 00 seconds, Dec +63 degrees 11 minutes 00 seconds

Size: 23' (15') Magnitude: 7.0 Class: III 2 m

North is up

West to the right

Telescope:

8" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -25c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 580 minutes (58 x 10 minute subs), 11/22/24/2011; seeing 2.3-3.4 FWHM per CCDStack

Processing:

CCDStack 2.53.4349.21251, Photoshop CS5.1

Location:

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

Notes:

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 15 arc minutes