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)
Sensitivity...ISO3200




Sh2-253/ Diffused Nebula
R.A.06h 25m 40.5s (2000.0)
Dec.+20°00' 46" (2000.0)
Apparent Size5.0'
Real Size12 light yrs.
Magnitude -
Distance8500 light yrs.
Other IDs-
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.




Sh2-245
(Orion-Eridanus superbubble)

Sh2-261


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