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)|
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.
|Sh2-290 / Planetary Nebula, type IIIa|
|R.A.||08h 54m 13.2s (2000.0)|
|Dec.||+08°°53' 59" (2000.0)|
|Real Size||22.8 light yrs.|
|Distance||152 light yrs.|
|Other IDs||Abell 31, PK 219+31.1|