Deep Sky Object in Winter
Hubble's Variable Nebula (NGC2261 in Monoceros)
|Date & Time: ||Nov 22 2003, from 26:30 to 26:48 JST(+0900)
|Composed 3 shots with 8 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|
A tiny reflection nebula of NGC2261 is positioned at 1 degree SW of nebulosity NGC2264 around the northern region of the Monoceros.
NGC2261 is reflecting the light of "R Mon" at the southern edge of the nebula.
R Mon changes in magnitude from 11 to 13, and the nebula itself changes the brightness with the variable star.
The nebula has a famous nickname of "Hubble's variable nebula".
|NGC2261 / Reflection Nebula, type 1 E+R|
|R.A.||06h 39m 12.0s (2000.0)|
|Dec.||+08° 43' 59" (2000.0)|
|Real Size||0.4 light yrs.|
|Distance||650 light yrs.|
The nebula has an apparent figure like a flame being spread toward north.
You can appreciate the bluish white light like this picture through scopes.