Deep Sky Object in Spring
NGC3945 (Galaxy in Ursa Major)


Date & Time: Dec 29 2014, from 26:41 to 27:25 JST(+0900)
Composed 8 shots with 6 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with a conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Canon EOS 600D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO3200




NGC3945 / Galaxy, type (R)SB(rs)0+
R.A.11h 53m 14.7s (2000.0)
Dec.+60° 40' 36" (2000.0)
Apparent Size5.3×3.5'
Radial Velocity1148km/s
Magnitude11.4
Distance70 million light yrs.
Group of GalaxiesUrsa Major N Group
Other IDsUGC6860, MCG10-17-96
CGCG292-42, PGC37258
NGC3945 is a minor galaxy with a long axis of 5 arc minutes positioned near midway between alpha and beta UMa. The galaxy is classified in indistinct bared galaxies. A bright nucleus is surrounded by rather dimmed region and furthermore very indistinct light encircles inner structures. Medium-sized telescopes can show you only central features, it's difficult to detect outer dimmed part.




NGC3938

NGC3953


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