M 71 (NGC 6838, GCL 115) Globular Cluster in Sagitta

Located at: RA 19 hours 53 minutes 46 seconds, Dec +18 degrees 46 minutes 42 seconds

Size: 7.2' Magnitude: 8.4 Class: --

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,  490 minutes  (49 x 10 minute subs), 07/26/27/28/2014; seeing 2.6-4.3 FWHM per CCDStack

Processing:

CCDStack 2.80.5308.25197, Photoshop CS5.1

Location:

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

Notes: See the 8" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6838

NGC 6838 = M71
19 53 46.1 +18 46 42
V = 8.1;  Size 7.2

17.5" (8/5/94): roughly 75 stars resolved in a 5' diameter but has a very 
irregular ill-defined outline to the halo.  The brightest section is elongated 
SSW-NNE with dimensions 3'x2'.  The brightest star is on the east side of the 
core and is a close double.  Located in a rich field with probably many field 
stars superimposed around the halo.  Located just south of the midpoint between 
Gamma and Delta Sagittae.

13": a few dozen stars are resolved over haze, only weakly concentrated, non-
symmetrical shape.  Impression that many faint field stars may be superimposed.  
Located in a very rich star field.

8": many faint stars resolved with averted, the W edge is brighter.  Open 
cluster H20 lies 40' SSW.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 6838
NGC 6838 = M 71 may also be NGC 6839, which see -- but probably not.
 - Dr. Harold G. Corwin, Jr.