NGC 6735 and Berkeley 81(Lund 875) Open Clusters in Aquila
Center of field at approximately: RA 19 hours 00 minutes 45 seconds, Dec -00 degrees 27 minutes 20 seconds
Size: 8.0' and 5.0' Magnitude: -- and -- Class: -- and II 2 r
North is up
West to the right
8" f5 Newtonian reflector
ST-8XME, self-guided, binned 1x1, temp -10c, camera control MaxIm DL 4.56
Lumicon Red filter, 300 minutes (30 x 10 minute subs), 09/31 & 10/1/2008; seeing 2.5-3.1 FWHM per CCDStack
CCDStack 1.3.7, Photoshop 7.0
Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)
|Notes:||Berkeley 81 is the object to the east (left) that *looks* like an open
cluster ... My plotting software (Megastar v5.0.12) does not plot
Berkeley 81. I only 'discovered' it by downloading a DSS image of NGC
6735, which is a very non-descript NGC open cluster around the 'bright'
star to the west (right). In the Arizona Database v9, NGC 6735 is listed as
"cluster of 35 stars surrounding SAO 142915".
From the NGC / IC Project:Contemporary Visual Observation for NGC 6735
NGC 6735 19 00 37 -00 28.5 V = 7.5; Size 14 17.5": about 50 mag 13 stars in a 10' field which are very uniform in brightness. The exception is a mag 7.2 multiple star (SA0 142915) on the N side which has three faint companions including a mag 13.4 star at 10" and a mag 12 companion at 22". This is a large but basically faint group. The outliers form a circular pattern and the W to N side is well-defined by a semicircle of stars. Discovered by JH (h2025). This is a cluster of ~30 stars surrounding SA0 142915. Listed as nonexistent in RNGC. Description and position given by JH are a perfect match. - by Steve GottliebHistorical Research Notes / Correction for NGC 6735
NGC 6735 is a clustering of stars around SAO 142915 (JH's position refers to this star), though the center of the cluster seems to be a bit southwest of the star. It matches JH's description quite well, and would probably stand out nicely in a wide-field eyepiece. - Dr. Harold G. Corwin, Jr.