Basic object information
Name: NGC 3945
Type of object: Galaxy
Magnitude: 10.9
Surface brightness: 11.6 mag/sq arcmin
Size: 6.4'x4.2'
Position angle: 15
Constellation: Ursa Major
Object classification: SBO-a Ring
Description: B,pL,R,gmbM,r,*12 sp
Notes: H I 251

Catalog position for epoch J2000.0
Right ascension: 11h 53m 14.7s
Declination: +60 40' 35"


Observer: Iiro Sairanen
Obs. place: Ahola, Joutseno Finland
Date/Time: 24/25.4.2001 23:20 UT

Telescope: TAL-1, Newton 110/805mm

Magn: 107x

Filter:

Field: 29'

NE Lim.mag: >6.5

Background sky: 2

Seeing: 2

Transparency: 2
Weather: 50% clouds, +8C

NGC 3945 näkyi ellipsin muotoisena himmeänä sumuna, jolla on hallitseva ydin. Itse asiassa halo erottui ainoastaan syrjäsilmällä katsottaessa. Aivan ytimen vieressä on noin 12 magnitudin tähti.

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