Deep Sky Object in Spring
Sh2-290 (Planetary Nebula in Cancer)


Date & Time: Nov 20 2015, from 24:58 to 26:10 JST(+0900)
Composed 8 shots with 10 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon with a conversion lens (f=742mm, F4.6)
with Astronomik CLS-CCD filter
Auto-guided with TAKAHASHI JP Equatorial & SBIG STV
Digital Camera: Canon EOS 550D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO1600




Sh2-290 / Planetary Nebula, type IIIa
R.A.08h 54m 13.2s (2000.0)
Dec.+08°53' 59" (2000.0)
Apparent Size16.2'
Real Size22.8 light yrs.
Magnitude12.2
Distance152 light yrs.
Other IDsAbell 31, PK 219+31.1
At the southern region of Cancer, Sh2-290 is a dimmed but fairly larger-scaled planetary nebula positioned at about 3 degrees south of alpha Cnc. We can capture faint figure of the nebula only with a telephoto lenses. This image shows the nebula has a bluish color in central and a reddish region surrounds around it. It's considered that Sh2-290 is one of most ancient and the largest known planetary nebulae, with a real diameter of about a bit smaller than 23 light years.




NGC4361

PK164+31.1


Copyright(c) 2015 by Naoyuki Kurita, All rights reserved.
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