Deep Sky Object in Autumn
Around Sh2-176 (Planetary Nebula in Cassiopeia)

Click on image to enlarge

Date & Time: Dec 24 2022, from 21:21 to 22:34 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

Sh2-176 / Planetary Nebula, type 5 E
R.A.00h 31m 53.6s (2000.0)
Dec.+57°22' 33" (2000.0)
Apparent Size12.0'
Real Size1.6 light yrs.
Magnitude -
Distance460 light yrs.
Other IDsLBN 597, PK 120-5.1
PNG 120.2-5.3
LBN594 / Reflection Nebula, type 6 R
R.A.00h 28m 39.0s (2000.0)
Dec.+56°42' 50" (2000.0)
Apparent Size2.0'
Real SizeN/A
Magnitude -
Other IDsLBN 595
Sh2-176 is an extraordinary faint planetary nebula positioned at about 1.5 degrees northwest of α-Cas. The nebula has an apparent diameter of about 12 arc minutes and is emitting reddish Hα light. Although the nebula has a round shape, we can recognize it like an arc-shaped in brighter southern side.
It's considered that the Sh2-176 is one of most ancient planetary nebulae, at the present the gaseous matter emitted from a dead central star has distributed in a diameter of about 1.6 light years.
In this image, you can see a very faint reflection nebula of LBN 594 located about 50 minutes southwest of Sh2-176 at the bottom of the field. The size is about 2 arc minutes, and you can see that the south side is slightly bluish.


Sh2-181, Sh2-182

Copyright(c) 2022 by Naoyuki Kurita, All rights reserved.
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