M 13 (NGC 6205, GCL 45) Globular Cluster in Hercules

Located at:  RA 16 hours 41 minutes 42 seconds, Dec +36 degrees 27 minutes 37 seconds

Size: 20' Magnitude: 5.8 Class: 5

North is up

West to the right

Telescope:

 14.5" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 360 minutes (120 x 3 minute {180 seconds} subs), 06/15/16/17/2013; seeing 2.8-3.7 FWHM per CCDStack

Processing:

CCDStack 2.69.4870.18821, Photoshop CS5.1

Location:

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

Notes:

I tried 3 minute subs on this one ... hoping not to burn out the core region of M 13. See the 8" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6205

NGC 6205 = M13 = Hercules Cluster
16 41 41.6 +36 27 27
V = 5.8;  Size 16.6

17.5" (7/9/94): several hundred stars in a 10'-12' diameter with a bright 
central core of 6' diameter.  Many stars are arranged in strings and loops 
including a distinctive streamer attached on the SE side which heads south and 
curves west forming a semicircle and another string is attached on the west side 
of the core and precedes the cluster.  Several chains of stars are also resolved 
over the 6' core.  A dark "lane" protrudes into the core on the SE side.  
Running along the north edge of the core is a starless strip or a long dark lane 
which separates the central region from the northern outer halo members.  Three 
small dark lanes in the core converge forming a "Y" which is referred to as the 
"Propeller".  N6207 lies 28' NE and extremely faint IC 4617 lies 14' NNE.

8": very bright, very large, round, highly resolved into several hundred stars 
mag 11.5-13.5 over the entire disc.  Includes several star chains and streamers.  
Fairly easy naked-eye in dark sky.

- by Steve Gottlieb