Deep Sky Object in Spring
M44 (The Praesepe in Cancer)

Date & Time: Mar 14 2015, from 21:16 to 21:42 JST(+0900)
Mosaic of 2 flames of composed 4shots with 3 minutes exposed
Optical: BORG 67FL with a conversion lens (f=255mm, F3.8)
with IDAS LPS-P2-FF Light-pollution suppression filter
Auto-guided with TAKAHASHI JP Equatorial
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)

M44 (NGC2632) / Open Cluster, type d, II 3 m
R.A.08h 40m 6.0s (2000.0)
Dec.+19° 59' 00" (2000.0)
Apparent Size95.0'
Real Size13 light yrs.
# of Stars50
Distance520 light yrs.
M44 (NGC2632) is a bright open cluster clearly visible to the naked eye on a dark enough sky. The cluster is well-known as "The Praesepe", meaning of a crib, and also called "The Beehive Cluster" in English. It's best appreciated with binoculars or small scope, its 1.5 degree size is equivalent to about three full-moons end-to-end, and distance is estimated about 520 light years.
This grouping is so large it was known in antiquity, when it was thought to be something non-stellar object like a nebula. Japanese had regarded the cluster as a lump of souls in the ancient time, and the sight of it had terrified them.



Copyright(c) 2015 by Naoyuki Kurita, All rights reserved.
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