Deep Sky Object in Summer
Sh2-22 (Diffused Nebula in Sagittarius)
|Date & Time: ||Aug 10 2013, from 22:43 to 23:02 JST(+0900)
|Mosaic of 2 flames that are RGB-composed from 6min.×4shots each|
|Optical: ||(GB image) BORG 60ED+Reducer (f=297mm, F5.0) with Moon & Skyglow filter
|(R image) TAMRON SP 300mmF2.8 (Stop: F2.8) with Astronomik CLS-CCD & R64 filters|
|Auto-guided with TAKAHASHI EM-200 Equatorial
|Digital Camera: ||(GB image) Canon EOS 600D (Remodeled)
|(R image) Canon EOS 550D (Remodeled)|
|Location: ||Koumi town, Nagano pref.
|Camera Settings: ||Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)|
|CCD Sensitivity...ISO800(GB image), ISO1600(R image)|
Sh2-22 is a faint emission nebula positioned at only 3 degrees southwest of the Lagoon Nebula (M8), which you can see in upper left hand side of this image.
Although the nebula has fairly larger size of about 80×50 arc minutes, little known because of its faintness figure.
The nebula has a dark gaseous matter obstructing in central region, looks like divided into two parts of northeast and southwest.
The nebula is floating around 4000 light years away toward the galactic center.
|Sh2-22 / Diffused Nebula, type 4 E|
|R.A.||17h 53m 50.0s (2000.0)|
|Dec.||-25° 00' 00" (2000.0)|
|Real Size||68 light yrs.|
|Distance||3900 light yrs.|