NGC 6704 (Lund 864, Cr 390) Open Cluster in Scutum

Located at: RA 18 hours 50 minutes 48 seconds, Dec -05 degrees 12 minutes 00 seconds

Size: 5.0' (6.0') Magnitude: 9.2 Class: I 2 m

North is up

West to the right

Telescope:

8" f5 Newtonian reflector

Camera:

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

Image:

Lumicon Deep Sky filter, 200 minutes (20 x 10 minute subs), 08/17/18/2007

Processing:

CCDStack 1.2, Photoshop 7.0

Location:

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

Notes:

This open cluster is almost lost in the rich background of the Scutum Star Cloud ... about 24 minutes NNW (upper right) is the Dark Nebulae complex B 110 and B 107.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 6.0 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6704

NGC 6704 = Cr 390 = Lund 864 = OCL-82
18 50 45 -05 12.3
V = 9.2;  Size 6

17.5": at 220x, 40 stars mag 12-15 are visible over unresolved haze, elongated 
N-S.  Three collinear mag 12.5 stars oriented NNW-SSE are equally spaced near 
the center.  Located 55' N of M11.

- by Steve Gottlieb