Basic object information
Name: NGC 2331
Type of object: Open cluster
Magnitude: 8.5
Size: 18.0'
Number of stars: 30
Magnitude of brightest star: 9.0
Object classification: IV 1 p
Description: Cl,L,vlC,S Cl inv
Notes: H VIII 40

Catalog position for epoch J2000.0
Right ascension: 07h 07m 00.0s
Declination: +27 16' 00"

Constellation: Gemini


Observer: Iiro Sairanen
Obs. place: Lakasenpelto, Imatra, Finland
Date/Time: 4/5.2.2003 21:47

Telescope: 16" Dobson f 4.5

Magn: 73x

Filter:

Field: 41'

NE Lim.mag: 5.5

Background sky: 4

Seeing: 4

Height: 52
Visuality: I

Weather: -15C

Not compressed, about 30 stars. Poor.

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