Deep Sky Object in Winter
Eskimo Nebula (NGC2392 in Gemini)

Date & Time: Jan 30 2004, from 23:22 to 23:34 JST(+0900)
Composed 4 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: Fujifilm FinePix S2 Pro
Location: Ooizumi vil., Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO1600, White Balance...Auto

NGC2392 / Planetary Nebula, type IIIb+IV
R.A.07h 29m 12.0s (2000.0)
Dec.+20° 55' 00" (2000.0)
Apparent Size47×43"
Real Size0.31×0.28 light yrs.
Distance1360 light yrs.
NGC2392 is a tiny planetary nebula about 4 degrees ESE of delta Gem that marks the body of Castor, the elder brother of twins. The nebula has an apparent diameter of less than 1 arc minute, and it might be difficult to distinguish the nebula from the normal stars unless 4-inch telescopes or larger. You need a magnifying power over 100 to enjoy the detailed structure.
The planetary nebula has a bright central region and the surrounding dimmed ring-structure. This shape gave NGC2392 a unique nickname of "Eskimo Nebula" because the shape associates a face of Eskimo with his head hooded. The Eskimo nebula shows us the gaseous matter spread in outer space by a dead star.



Copyright(c) 2004 by Naoyuki Kurita, All rights reserved.
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