Object: Open cluster NGC 7789                   Constell: CAS

RA: 23h 57.0m           Decl: +56° 44'          Epoch: 2000
Mag: 6.7m               Size: 16'               Type: II 1 r

Observer: Jere Kahanpää
Obs. place: Hartola, Finland
Date/Time: 31./1. 8./9. 1997, 00.20-00.55

Telescope: N 205/1000
Magn: 80x               Filter: -
Field: 37'              NE Lim.mag: 6.2m
Background sky: 2       Seeing: 3
Weather: +14 °C, no Moon.

Brightness: 3           Alt: 70°
Description: An showpiece, easy with 9x25 binoculars. Hundreds
of stars resolved at 80x. A system of dark lanes seems to cut
the cluster into several separate condensations. The brightest
such patch lies in the S part of the cluster and is surrounded
by a sharply defined oval dark ring with a diameter of 3'.
Another somewhat more diffuse ring lies N of the first. Diam. of
the whole system is about 12'.