Object: Nonex-open cluster NGC 6991             Constell: CYG

RA: 20h 54.5m           Decl: +47° 17'          Epoch: 2000
Mag:                    Size: 5'                Type: II 2 p
                                                      (own)
Observer: Jere Kahanpää
Obs. place: Jyväskylä, Finland
Date/Time:  12./13.8.1996, 01.20

Telescope: N 205/1000
Magn: 80x               Filter:
Field: 37'              NE Lim.mag: 5.2m
Background sky: 3-4     Seeing: 2-3
Weather: +10 °C, no Moon.          

Brightness: 2           Alt: 75°
Description: 
x = NGC position. The original descr. from W. Herschel: "A star
6m ... not in the middle but following. Surrounded by many cst.
forming a brilliant sc. Cl." The mag. 6 star W.H. mentions is
near the NE edge of the field. 

The field includes at least 2 candidates. A) A diam. 7'
triangular cluster of about 20 stars mag. 11...13. This is a
nice but unconcentrated group near the center of the field. The
brighest one is on the SW edge. The NGC position is very near
the brightest star of this group. Est. Tr-type III 2 p.

B) A bit brighter but not as well detached group of stars 10' NW
of the first one. Includes 20 stars mag. 9...11. Tr-type IV 2 p.
This group is visible in the drawing as a slight concentration
of bright stars in the NW quarter. Position  RA 20h 54.4m (2000)
                                             Dekl. +47° 26.7'
 
I'm not quite sure of what W.H. refers to. Maybe the whole field
could be the "brilliant sc. Cl.". On the other hand A) is quite
a striking group. The MW is very rich here but star density
drops dramatically towards E.