Object: Open cluster DO 23                      Constell: MON

RA: 06h 43.1m           Decl: +00° 00'          Epoch: 2000
Mag:                    Size: 12'               Type: IV 3 p

Observer: Jere Kahanpää
Obs. place: Helsinki, Finland
Date/Time: 14./15.12.1996, 23.40

Telescope: C 200/2000
Magn: 80x               Filter:
Field: 37'              NE Lim.mag: 5.5m
Background sky: 4       Seeing: 2 
Weather: -7 °C, no Moon.           

Brightness: 3           Alt: 25°
Description: A small group of stars in a rich field. About 15
stars mag. 7...12. Round, slightly ring-shaped. There are
several other similar but somewhat fainter group within 1°. One
is partially visible on the ENE edge.