NGC 6535 (GCL 83) Globular Cluster in Serpens   

Located at: RA 18 hours 03 minutes 51 seconds, Dec -00 degrees 17 minutes 49 seconds

Size: 3.4' Magnitude: 9.3 Class: 11

North is up

West to the right

Telescope:

 14.5" f5 Newtonian reflector

Camera:

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

Image:

 Lumicon Red filter, 380 minutes (38 x 10 minute subs), 08/2/3/2015; seeing 2.7-4.0 FWHM per CCDStack

Processing:

CCDStack 2.90.5589.16047, Photoshop CS5.1

Location:

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

Notes:

Taking advantage of evening clear skies (before the marine stratus moves in) to image some southern objects ... Small galaxy to the west (right) is CGCG 28-4 (0.4'x0.4', mag 15.6, Cl:--), or 2MASX J18032745-0017427 from the CDS.

From the NGC/IC Project:

Contemporary Visual Observation(s) for NGC 6535
NGC 6535
18 03 50.6 -00 17 49
V = 10.6;  Size 3.6

18" (8/23/03): at 435x, appears fairly faint, ~3' diameter with an irregular 
outline, and just a weak concentration.  A trio of mag 13-13.5 stars are easily 
resolved on the west edge and the middle star has two close, mag 14.5 and 15.5 
companions.  With careful viewing about a dozen extremely faint stars sparkle 
over the central glow, often popping in out of averted vision.  At 538x, the 
cluster barely breaks up into a swarm of extremely faint stars in steady 
moments.

17.5" (8/10/91): moderately bright, roughly circular, 3' diameter.  Three mag 13 
stars and a mag 14 star are almost on a line oriented N-S on the west edge.  
Very mottled and granular appearance with an irregular outline.  Can just 
steadily resolve a few very faint stars and another half a dozen extremely faint 
stars pop in and out of view over the core.  Located within a rich star field.

- by Steve Gottlieb