M 30 (NGC 7099, GCL 122) Globular Cluster in Capricornus

Located at: RA 21 hours 40 minutes 22 seconds, Dec -23 degrees 10 minutes 45 seconds

Size: 12' Magnitude: 6.9 Class: 5

North is up

West to the right


 8" f5 Newtonian reflector


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


Lumicon Deep Sky filter, 240 minutes (24 x 10 minute subs), 10/9/10/2007


CCDStack 1.3, Photoshop 7.0


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


The bright star to the east (left) of this impressive Messier globular cluster is 5.3 magnitude 41 Capricorni.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 7099

NGC 7099 = M30 = E531-SC21
21 40 22.0 -23 10 45
V = 7.4;  Size 12.0

17.5" (8/17/01): viewed at 575x in excellent seeing.  Very irregular appearance 
with strings of stars emanating from a irregular bright, partially resolved 
core.  A prong off the W side heads NW with three equally spaced similar stars 
with a 4th star a close triple.  Another bright line of three stars heads due 
north with a fainter bent elbow of stars angling towards the NE.  Roughly a 
dozen stars trail to the east with a large gap towards the edge of the halo.  A 
fairly well defined semi-circle of stars open to the north passes directly 
through the core and off the SE side.  The outer halo is peppered with dozens of 
faint stars over a dim background haze and with concentration the overall 
diameter increases significantly to at least 10'.

17.5" (7/5/86): the small bright core is not resolved but the halo is well 
resolved into 50-60 stars.  A small circular detached piece is E of the core 
with resolved stars.  Along the N side the resolved stars are brighter and 
arranged in lanes.

13" (9/29/84): fascinating view at 350x; ~25 stars resolved in the outer halo.  
A few stars (half dozen) are bunched together near the bright, unresolved 
irregular core over a fainter diffuse halo.

13": three star lanes are obvious on the N side.  Good resolution in the halo 
and outer stragglers.  The core appears on the verge of resolution at 288x.

8": two short straight star lanes to N and NW give a unique "prong" appearance.  
A few faint stars are resolved SE of the core.

- by Steve Gottlieb