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 / Diffused Nebula, type 4 E
R.A.17h 53m 50.0s (2000.0)
Dec.-25° 00' 00" (2000.0)
Apparent Size80×50'
Real Size68 light yrs.
Magnitude -
Distance3900 light yrs.
Other IDsLBN14
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.

Around Sh2-16

Vast nebula around zeta Oph(Sh2-27)

Copyright(c) 2013 by Naoyuki Kurita, All rights reserved.
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