Deep Sky Object in Winter
NGC1851 (Globular Cluster in Columba)

Date & Time: Dec 5 2015, from 23:51 to 24:31 JST(+0900)
Composed 6 shots with 8 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 D600 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
CCD Sensitivity...ISO1600

NGC1851 / Globular Cluster, type II
R.A.05h 14m 6.0s (2000.0)
Dec.-40° 03' 00" (2000.0)
Apparent Size5.3'
Real Size72 light yrs.
Distance54 thousand light yrs.
It's M79 in a constellation of Lepus that represents the globular clusters in winter skies. NGC1851 is another globular in winter south of M79, in a constellation of Columba. Actually NGC1851 has brighter magnitude and larger diameter than those of M79. But the globular has a height of meridian transit at most 15 degrees at around Tokyo, has much fewer chances to observe that than M79. The cluster has a highly concentration class of II, and coming on top of the bad scintillation in lower skies, it's fairly difficult to resolve the individual member stars around center of cluster.


5th Scenes: Constellations

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