Object: Open cluster NGC 6633                   Constell: OPH

RA: 18h 27.7m           Decl: +06° 34'          Epoch: 2000
Mag: 4.6m               Size: 27'               Type: III 2 m

Observer: Jere Kahanpää
Obs. place: Helsinki, Finland
Date/Time: 16./17.9.1996, 23.00

Telescope: R 135/1950
Magn: 40x (?)           Filter:
Field: 80'              NE Lim.mag: 5.4m
Background sky: 3-4     Seeing: 3 
Weather: +5 °C, no Moon.           

Brightness: 1           Alt: 25°
Description: A beautiful cluster in a very rich field. About 15
very bright (8-9m) stars and 20 fainter ones. Diameter about
30', clearly elongated W-E, N-S diameter 15'.