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 x 2016)|
|CCD Sensitivity...ISO1600, White Balance...Auto|
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.
|NGC2392 / Planetary Nebula, type IIIb+IV|
|R.A.||07h 29m 12.0s (2000.0)|
|Dec.||+20° 55' 00" (2000.0)|
|Apparent Size||47 x 43"|
|Real Size||0.31 x 0.28 light yrs.|
|Distance||1360 light yrs.|
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.