Deep Sky Object in Spring
M90 (Galaxy in Virgo)

Date & Time: Apr 28 2017, from 22:28 to 23:02 JST(+0900)
Composed 12 shots with 3 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
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...ISO6400, White Balance...Daylight

M90 (NGC4569) / Galaxy, type SAB(rs)ab I-II
R.A.12h 36m 50.0s (2000.0)
Dec.+13° 09' 48" (2000.0)
Apparent Size9.6×4.4'
Radial Velocity+87km/s
Distance55 million light yrs.
Group of GalaxiesVirgo Cluster
Other IDsUGC7786, MCG2-32-155
M90 is a member of Virgo Cluster just 40 arc minutes north of M89 in previous page. The galaxy has an apparent shape of elliptic a bit stretched in north-south direction. Although M90 has a long axis of 10 arc minutes, it's fairly dimmed because of its brightness of 10. So it's difficult to resolve detailed structures with amateur telescopes. Actually M90 is a spiral galaxy classified as Sc type, a dark lane is striking around the central nucleus.



Copyright(c) 2017 by Naoyuki Kurita, All rights reserved.
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