Deep Sky Object in Spring
NGC3359 (Galaxy in Ursa Major)



Date & Time: Dec 27 2019, from 25:32 to 26:27 JST(+0900)
Composed 10 shots with 6 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow filter
Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight



NGC3359 / Galaxy, type SB(rs)c II
R.A.10h 46m 36.5s (2000.0)
Dec.+63°13' 26" (2000.0)
Apparent Size7.3×4.3'
Radial Velocity+1008km/s
Magnitude11.0
Distance49 million light yrs.
Group of Galaxies -
Other IDsUGC 5873, CGCG 313-33
MCG +11-13-37, IRAS 10433+6329
PGC 32183
NGC3359 is a medium-scaled spiral galaxy floating at 2.5 degrees northwest from beta UMa (Dubhe) which forms the Big Dipper. The galaxy has a long axis a bit longer than 7 arc minutes; this image shows you evolved S-shape wound arms clearly. The distance from us has been estimated as about 49 million light years.
As shown in an inversed image, the galaxy has a much smaller companion SDSS J1044+6306 at 14 arc minutes south west. It's known that NGC is "devouring" the dwarf galaxy and it will disappear eventually. Of course the dwarf is out of amateur's observation target. However, the phenomenon is strongly interested by astronomers and the dwarf has been nicknamed "the Little Cub".
NGC3359 & dwarf galaxy SDSS J1044+6306





NGC3344

NGC3432


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