Deep Sky Object in Winter
Sh2-253 (Diffused Nebula in Gemini)

Click on image to enlarge

Date & Time: Dec 28 2024, from 22:16 to 23:28 JST(+0900)
Composed 10 shots with 8 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS LPS-D1 light-pollution suppression filter
Auto-guided with TAKAHASHI JP Equatorial+SBIG STV
CMOS Camera: ZWO ASI2600MC Pro (Cooled temp.: -25°C)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...16bit FITS, converted to 16bit TIFF(6248×4176)
Device Size...23.5×15.7mm, Gain...100


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 50 arc minutes west of a 4th star (ν Gem) seen in left hand side of the image 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.
This image has been cropped with a focal length of 700mm.



Sh2-250, Sh2-251
Sh2-260, Sh2-262

Copyright(c) 2025 by Naoyuki Kurita, All rights reserved.
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