Deep Sky Object in Spring
M81 & M82 (Galaxies in Ursa Major)

Date & Time: M81(left)...Feb 18 2012, from 24:40 to 25:39 JST(+0900)
M82(right)...Feb 18 2012, from 25:52 to 26:22 JST(+0900)
Composed 6 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 & Pictor 201XT
Digital Camera: Canon EOS 550D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

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

M81 (NGC3031) / Galaxy, type SA(s)ab I-II
R.A.09h 55m 33.5s (2000.0)
Dec.+69° 04' 00" (2000.0)
Apparent Size27.0×14.1'
Radial Velocity+69km/s
Distance17.9 million light yrs.
Group of GalaxiesM81 Group
Other IDsUGC5318, MCG12-10-10,
M82 (NGC3034) / Galaxy, type I0
R.A.09h 55m 54.0s (2000.0)
Dec.+69° 40' 57" (2000.0)
Apparent Size11.2×4.3'
Radial Velocity+323km/s
Distance17.9 million light yrs.
Group of GalaxiesM81 Group
Other IDsUGC5322, MCG12-10-11,
This image presents two bright galaxies just above the Big Bear's head. This pair float about 18 million light years away, can be recognized only with binoculars as two tiny light points. M81 (NGC3031) on left hand side is a superb spiral galaxy, and forms a splendid pair with M82 (NGC3034) in right flame. M82 at the upper isn't a spiral on edge, but is considered as spindle shaped.
The galaxy is rather mysterious; it's thought that an explosion about 1.5 million years ago made the odd shape, M82 is famous as "The Exploding Galaxy". It's known that those galaxies had drawn near some ten millions years ago. And it's considered that the gigantic gravitational interaction in that time made the activity in M82.

Wide-field image around M81 & M82 (75KB)
Topics: Supernova 2014J in M82
⇒ Display the spectral profile of M82
(in new window)

M64(Black-eye Galaxy)


Copyright(c) 2012 by Naoyuki Kurita, All rights reserved.
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