NGC 6749 (GCL 107) Globular Cluster in Aquila

Located at: RA 19 hours 05 minutes 15 seconds, Dec +01 degrees 54 minutes 03 seconds

Size: 4.0' Magnitude: 12.4 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, 370 minutes (37 x 10 minute subs), 08/31 & 09/1/2016; seeing 2.9-4.5 FWHM per CCDStack

Processing:

CCDStack 2.92.6001.26126, Photoshop CS5.1

Location:

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

Notes: From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6749
NGC 6749 = Be 42 = C1902+018 = OCL-91 = Lund 876
19 05 15.2 +01 54 03
V = 12.4;  Size 6.3

17.5" (7/1/00): very faint, very low surface brightness globular in a dusty 
portion of the Aquila milky way (dimmed by at least 4.5 magnitudes of 
extinction).  The core is 15"-20" slightly brighter spot less than 1' SW of a 
mag 12 star.  The surrounding halo is just a weak glow with averted vision, 2'-
2.5' in diameter with an ill-defined edge, and just brighter than the milky way 
background.  The glow encompasses the mag 12 star on its northeast side but does 
not reach two mag 13.5 stars off the south side. This cluster would most likely 
be overlooked if just quickly scanning the field and along with N6380 is one of 
the two most difficult NGC globulars!

17.5" (7/24/95): very faint, ~3' diameter, unusually low surface brightness for 
a globular cluster with only a very weak central brightening.  A mag 12 star is 
superimposed on the N side and two mag 13.5 stars are at the S end (not 
members).  The core appears to be located ~1' SW of the mag 12 star. Does not 
appear like a globular but rather a diffuse nebula in a rich milky way field.  
Difficult to determine exact outer extent.

13": extremely faint, moderately large, very low surface brightness and fades at 
high power.  Near the visual threshold this is one of the two faintest NGC 
globulars along with N6380.  Estimate V = 14.  Located at the NW edge of an 
elongated group of six mag 12/13 stars and 25' ESE of mag 5.8 SAO 124203.  The 
position listed in the NGC, SC2000, N2000, U2000, and DSFG are all about 7' too 
far S.

Discovered by JH (h2029). His description "a cluster of loose small stars of 
various magnitudes; fills the field." appears to describe a larger clustering 
including the globular.  Although listed as a GC in the RNGC, the new 
description quotes Carlson and incorrectly states "no cluster".  Listed in Lynga 
as an open cluster = Berkeley 42.  The position listed in SC2000, NGC, L&S, 
N2000, U2000, and DSFG are all wrong, mostly in Dec ~7'.  Skiff letter on 
subject 3/93.  Exact position 19 05 15.2 +01 54 03.

- by Steve Gottlieb