Deep Sky Object in Summer
IC4701 (Diffused Nebula in Sagittarius)

Date & Time: Aug 10 2013, from 23:15 to 23:49 JST(+0900)
Mosaic of 2 flames that are RGB-composed from 6min.×6shots 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)

IC4701 / Diffused Nebula, type 4 E
R.A.18h 16m 15.0s (2000.0)
Dec.-16° 33' 00" (2000.0)
Apparent Size60×41'
Real Size15 light yrs.
Magnitude -
Distance11700 light yrs.
Other IDsSh2-44, LBN56
Gum 79
In northern edge of the Sagittarius, you can find out a faint emission nebula of IC4701 at a degree southwest of the Omega Nebula (M17). The nebula has a size of about 60×40 arc minutes but is extraordinary dimmed, not a observing object in scope-aided eyes. The nebula is positioned just north of the Star Cloud in Sagittarius, you can appreciate uncountable fine stars distributed at this vicinity. The distance to the nebula has been estimated about 12 thousand light years.

Around IC4628, H12

Cocoon Nebula(IC5146)

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