NGC 188 (Cr 6) Open Cluster in Cepheus

Located at: RA 00 hours 47 minutes 30 seconds, Dec +85 degrees 14 minutes 30 seconds

Size: 13' Magnitude: 8.1 Class: I 2 r

North is up

West to the right

Telescope:

8" f5 Newtonian reflector

Camera:

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

Image:

 Lumicon Red filter, 610 minutes (61 x 10 minute subs), 06/24/25/26/2012; seeing FWHM 2.7-3.5 per CCDStack

Processing:

CCDStack 2.66.4490.32361, Photoshop CS5.1

Location:

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

Notes: NGC 188 is by far the closest object to the pole (north) that I have imaged from home ... Polaris is visible from my observatory, just to the west (right) of the large pine tree to my northwest, and just above the smaller trees in the background. This time of year NGC 188 is in a little 'clear zone' of several degrees above the background trees and to the right of Polaris and the large pine tree. Unfortunately, the seeing was not good, as NGC 188 does not change Altitude or Azimuth much during the 3 hours I imaged it each night.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 188
NGC 0188 = Cr 6 = Mel 2 = OCL-309
00 47 30 +85 14.5
V = 8.1;  Size 14

17.5" (12/26/00): At 100x, ~75 stars a 10'-12', roundish group.  The cluster is 
fairly rich but unconcentrated with a noticeable void of stars near in the 
center and a somewhat ill-defined boundary.  The stars appear to be layered with 
at least a dozen mag 12-13 stars superimposed on a much richer carpet of mag 14-
15 stars over unresolved haze.  At 220x, some additional very faint stars are 
visible bringing the total up to ~85.  Two mag 9.5-10 field stars are just off 
the west edge and two mag 8.5-9 stars are beyond the eastern border. This is one 
of the older known open clusters, ~6.3 billion years.

13" (8/24/84): about 50 stars at 62x with several mag 7-9 stars in field, 
appears fully resolved.

8": large cluster, many faint stars, not rich, blank areas near center.

- by Steve Gottlieb