NGC 6426 (GCL 76) Globular Cluster in Ophiuchus

Located at: RA 17 hours 44 minutes 55 seconds, Dec +03 degrees 10 minutes 13 seconds

Size: 4.2' Magnitude: 10.9 Class: 9

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, 440 minutes (4 x 10 minute subs), 07/4/5/6/2016; FWHM 2.9-3.7 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: See the 8" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6426

NGC 6426
17 44 54.7 +03 10 13
V = 11.2;  Size 3.2

18" (8/23/03): at 160x, appears fairly faint with an irregular triangular 
outline, 2.5' diameter.  There is only a weak concentration though the surface 
has a patchy, irregular appearance with a few faint stars superimposed.  At 
435x, the brightest resolved star is at the NW edge and a few others resolved 
halo stars along the western side are collinear.  The slightly brighter core is 
offset east of the geometric center and just resolved into several extremely 
faint stars at moments.  A total of up to 10 mag 15 to 16 stars are resolved at 
moments.

17.5" (5/30/92): fairly faint, 3' diameter, slightly elongated, only a weak 
central condensation, slightly granular.  Two or three faint stars are resolved 
at the edge of the halo.  At 286x, a few additional very faint stars are 
resolved over the core for a total resolution of just six stars.  A striking 
double ?2202 = 6.2/6.6 at 21" lies 36' S.

8": faint, small, round, diffuse.

- by Steve Gottlieb