Deep Sky Object in Winter
Sh2-253 (Diffused Nebula in Gemini)
|Date & Time: ||Dec 27 2014, from 26:27 to 27:11 JST(+0900)
|Composed 8 shots with 6 minutes exposed|
|Optical: ||Meade 25cm(10") Schmidt-Cassegrain with a conversion lens (f=1600mm, F6.3)
|with BaaderPlanetarium Moon&Skyglow filter|
|Auto-guided with Meade LX200 Equatorial & Pictor 201XT
|Digital Camera: ||Canon EOS 600D (Remodeled)
|Location: ||Ooizumi, Hokuto city, Yamanashi pref.
|Camera Settings: ||Recording format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)|
A minor emission nebula of Sh2-253 is lying at the western edge of Gemini, near a boundary on Orion.
We can find the nebula at about 3 degrees south of a unique-shaped H-alpha nebula of the Jerry-fish nebula (IC443) at the leg of Castor.
Sh2-253 has a size of only 5 arc minutes at most, moreover the nebula is extraordinary dimmed. It's not a striking target for telescope-aided observation.
|Sh2-253/ Diffused Nebula|
|R.A.||06h 25m 40.5s (2000.0)|
|Dec.||+20°00' 46" (2000.0)|
|Real Size||12 light yrs.|
|Distance||8500 light yrs.|