Basic object information
Name: NGC 1981
Type of object: Open cluster
Magnitude: 4.2
Size: 25.0'
Number of stars: 20
Magnitude of brightest star: 6.3
Object classification: III 2 p n
Description: Cl,vB,lRi,st L,sc
Notes: In Ori OB1;incl D* Struve 750

Catalog position for epoch J2000.0
Right ascension: 05h 35m 12.0s
Declination: -4 26' 00"

Constellation: Orion

Observer: Iiro Sairanen
Obs. place: Lakasenpelto, Imatra, Finland
Date/Time: 9/10.1.2002 21.45 UT

Telescope: 16" Dobson f 4.5

Magn: 73x


Field: 41'

NE Lim.mag: 4,5

Background sky: 4

Seeing: 3

Transparency: 4
Weather: foggy, -1C

Vähätähtinen avonainen helpossa paikassa.