Deep Sky Object in Spring
NGC4559 (Galaxy in Coma Berenices)

Date & Time: Mar 24 2018, from 25:23 to 26:08 JST(+0900)
Composed 8 shots with 5 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 & Pictor 201XT
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

NGC4559 / Galaxy, type SAB(rs)cd II-III
R.A.12h 35m 57.3s (2000.0)
Dec.+27° 57' 53" (2000.0)
Apparent Size10.8×4.4'
Radial Velocity683km/s
Distance30 million light yrs.
Group of GalaxiesNGC4631 Group
Other IDsUGC7766, MCG5-30-30
CGCG159-24, PGC42002
A galaxy of NGC4559 belongs to a constellation of Coma Berenices, and the galaxy is lying just 2 degrees of NGC4565, which is a very popular edge-on galaxy. NGC4559 has major axis and visual magnitude of 10 arc minutes and 10.2, respectively. Actually these size and brightness are almost equal to those of NGC4565. A galaxy of NGC4565 is very familiar as an example of edge-on appearance, while NGC4559 isn't so well known because of its figure without characteristics.
Though the galaxy will show you a simple lump of dimmed light with scopes, indistinct arms are detected on films and it's understood that the galaxy has spiral structure a bit tilted from being edge-on.



Copyright(c) 2018 by Naoyuki Kurita, All rights reserved.
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