NGC 6743 Open Cluster* in Lyra

Located at: RA 19 hours 01 minutes 27 seconds, Dec +29 degrees 17 minutes 00 seconds

Size: 8.0' Magnitude: -- Class: cluster?

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

  ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 360 minutes  (36 x 10 minute subs) 06/22/23/24/2010; seeing 2.0-2.6 FWHM per CCDStack

Processing:

CCDStack 2.6.3800.24688, Photoshop 7.0

Location:

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

Notes:*

From "Star Clusters", by Brent Archinal and Steven Hynes; from the Notes, in part: "This is John Herschel's [1833, 462] h 2028, which he lists at (1830.0) 18h 54m 47.7s, NPD 60d 58m 3s. His description is: "A p L, poor cl of stars forming irreg groups or patches, 11.12; diam=8'." ...

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6743

NGC 6743
19 01 20 +29 16.6

17.5": about 35 stars in a 6' diameter group centered on a bright wide double 
star h1361 = 8.3/10.6 at 18".  The boxy outline stands out reasonably well at 
100x.  There are no dense spots and the group appears fully resolved.  A mag 10 
star is at the NW end 4' from h1361.  Listed as nonexistent in the RNGC.

JH: "A pL, poor cl of stars forming irreg groups or patches, 11..12m, dia =8'."  
Skiff reports a weak cluster is visible on the POSS centered on HD 176970 at 19 
01 26.7 +29 17 14.  ~25 stars brighter than mag 13, 5' diameter centered on HD 
176970 (8.3/10.6 at 18").  See NGCBUGS.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 6743
NGC 6743.  JH describes this as "A pL, poor cl of stars forming irreg groups
or patches, 11 ... 12 m; diam = 8'."  About an arcminute preceding his 
position are three pretty bright stars and roughly 30 fainter ones scattered
over an area about 8 - 10 arcmin across.  This is doubtless the group that JH
saw.  

As with many of these apparent clusterings, it may not be a real cluster.  It
will take astrometric and photometric studies to determine whether the stars
are neighbors in space. - Dr. Harold G. Corwin, Jr.