Deep Sky Object in Spring
M101 (Pinwheel Galaxy in Ursa Major)


Date & Time: Jan 12 2013, from 27:32 to 28:32 JST(+0900)
Mosaic of 2 flames of 4 shots composed with 8 min. exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
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...ISO1600




M101 (NGC5457) / Galaxy, type SAB(rs)cd I
R.A.14h 03m 12.7s (2000.0)
Dec.+54° 21' 03" (2000.0)
Apparent Size28.8×26.9'
Radial Velocity+360km/s
Magnitude8.3
Distance22.5 million light yrs.
Group of GalaxiesM101 Group
Other IDsUGC8981, MCG9-23-28,
PGC50063, Arp 26
M101 (NGC5457) is a vast galaxy with open spirals, equivalent size to about two-third of the Moon and about 22 million light years away. Although seen face on, it's dim and it takes a large scope and a good sky to see this nebula at its best.
The galaxy is located 4 degrees east of zeta UMa (Mizar), the second star from the tip of the Big Dipper's handle, and the usual method given to find M101 is to the hop of several stars with fifth or sixth magnitude from Mizar.

  Wide-field image around M101 (60KB)
Finding chart of M101 From Mizar to M101

  The star-hop route from Mizar to M101. You can find out M101 easily by tracing 81, 83, 84 and 86 UMa eastward.
(Taken with f=200mm telephoto lens)





M94

NGC5866(M102)


Copyright(c) 2013 by Naoyuki Kurita, All rights reserved.
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