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

Click on image to enlarge

Date & Time: Nov 28 2021, from 22:48 to 23:52 JST(+0900)
Composed 16 shots with 4 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
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...32bit FITS(2×2 binning), converted to 16bit TIFF(5496×3672)
Device Size...13.2×8.8mm, Gain...400

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
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.



Copyright(c) 2021 by Naoyuki Kurita, All rights reserved.
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