Deep Sky Object in Autumn
Around PK136+5.1 & Abell 6 (Planetary Nebulae in Cassiopeia)

Click on image to enlarge

Date & Time: Oct 22 2022, from 25:34 to 26:45 JST(+0900)
Composed 8 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


PK136+5.1 / Planetary Nebula, type SNR?
R.A.03h 03m 48.8s (2000.0)
Dec.+64°53' 28" (2000.0)
Apparent Size8.3'
Real SizeN/A
Magnitude -
DistanceN/A
Other IDsHFG 1
Abell 6 / Planetary Nebula, type IIb
R.A.02h 58m 42.0s (2000.0)
Dec.+64°30' 07" (2000.0)
Apparent Size3.1'
Real SizeN/A
Magnitude -
DistanceN/A
Other IDsPK 136+4.1
This image captured two dimmed planetary nebulae located 3 degrees north of vast reddish nebulae of IC1805 (Heart Nebula) and 1848 (Embryo Nebula) in Cassiopeia.
A larger one in upper left (northeast) PK136+5.1 has a diameter of 8 arc minutes, discovered in 1982 photographically. Although invisible in this image, a 13th magnitude central star formed the nebula. The nebula seems to be filled evenly, and the narrow shock front surrounds the southern part of central area with a small gap. The northern part of the front looks incomplete.
Another one in lower right (southwest) has an ID of Abell 6 and a visual diameter about 3 arc minutes, is emitting OIII greenish light. Abell 6 seems to be circular with its edge of partly brightened and terminated sharply. The central 19th magnitude star is faint and can barely be detected.



PK131-5.1
PK138+4.1

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