Deep Sky Object in Autumn
Sh2-173 (Diffused Nebula in Cassiopeia)

Click on image to enlarge

Date & Time: Sep 30 2022, from 27:12 to 28:02 JST(+0900)
Composed 6 shots with 10 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.: -15°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

Sh2-173 / Diffused Nebula, type 5 E
R.A.00h 21m 51.8s (2000.0)
Dec.+61°44' 17" (2000.0)
Apparent Size25.0×25.0'
Real Size77 light yrs.
Magnitude -
Distance8800 light yrs.
Other IDsLBN593
Sh2-173 is a very dimmed emission nebula at about 3 degrees northeast from β Cas. The nebula has an apparent span of about 25 arc minutes, you can detect a western loop looks comparatively striking. It's one of inter-stellar gaseous matters distributed in autumnal Milky Way, but this object can hardly be paid attentions among astro-photographers. It's estimated that the nebula is about 8800 light years away.
You can find out a tiny nebula of Sh2-172 at a degree southwest of Sh2-173.
Objects around Sh2-173 Objects around Sh2-173

Around Sh2-163

Around Sh2-176

Copyright(c) 2022 by Naoyuki Kurita, All rights reserved.
To top page To Deepsky in Autumn index Cassiopeia