Deep Sky Object in Spring
Abell 28 (Planetary Nebula in Ursa Major)

Click on image to enlarge

Date & Time: Nov 22 2025, from 27:39 to 28:51 JST(+0900), 8min.×10shots
Nov 23 2025, from 26:32 to 28:09 JST(+0900), 8min.×13shots
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.: -20°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


Abell 28 / Planetary nebula, type IIb
R.A.08h 41m 35.5s (2000.0)
Dec.+58°13' 49" (2000.0)
Apparent Size4.7'
Real SizeN/A
Magnitude14.6
DistanceN/A
Other IDsPK 158+37.1
Abell 28 is a faint planetary nebula located 2.8 degrees SSE of ο Ursae Majoris, the star that forms the tip of the Great Bear's snout. It has an apparent diameter of 4.7 arcminutes and emits red Hα light, with a 17th-magnitude central star. With an overall brightness of magnitude 14.6 and very low surface brightness, the nebula can be seen only in long-exposure images. Faint molecular clouds drift around Abell 28, and just to its east a streak-like nebula running north-south can be seen.



Abell 16
Abell 30

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