See also: Another observation of IC 4996

Object: Open cluster DO 39 (& IC 4996)          Constell: CYG

RA: 20h 16.4m           Decl: +37° 53'          Epoch: 2000
Mag:                    Size: 12'               Type: IV 2 m n
                                                   or III 1 m n
Observer: Jere Kahanpää
Obs. place: Jyväskylä, Finland
Date/Time:  8./9.8.1996, 01.00

Telescope: N 205/1000
Magn: 80x               Filter:
Field: 37'              NE Lim.mag: 5.2m
Background sky: 4-5     Seeing: 3 
Weather: +10 °C, 1/3 Moon rising E.

Brightness: 3           Alt:    
Description: DO 39: About 25 stars mag. 10... in an irregular and
slightly concentrated cluster. 15' N of IC 4996, which is
visible near the S edge of the field. Somwhat oblong S-N.
Catalogue size and own estimate are the same. OK. Note: Megastar
and DSFG gives Class: IV 2 m n while my own cat. entry  gives
III 1 m n (from SAC database). Personally I'd prefer the III 1 m

IC 4996: A group of bright stars surrounding a 6x-star. The
central sextet(?) is very nice. St10...12. Size 6'-7'.