Deep Sky Object in Summer
Around IC4628, H12 (Diffused Nebula & Open Cluster in Scorpius)

Date & Time: May 4 2016, from 26:09 to 26:39 JST(+0900)
Mosaic of 2 flames of 4min.×4shots
Optical: BORG 60ED with a conversion lens (f=245mm, F4.1)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS 6D (Remodeled)
Location: Furudono town, Fukushima pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5472×3648)
Device Size...35×24mm, Sensitivity...ISO1600

Objects around IC4628

Objects around IC4628, H12
Italics denote the open clusters
Around between mu and zeta Scorpii, there are various tiny clusters and diffused nebulae lying scattered. They're positioned near the Milky Way of the Galaxy's central region.
A redish diffused nebula in central part is catalogued as IC4628, actually it's vast one being pushed out of the field of the photo. And a very scattered large cluster occupies in just lower part of IC4628 is called H (Herschel's Catalogue) 12, mainly consists of stars with magnitude 6th or 7th.
Finally you'll be able to identify a bright open cluster of NGC6231 in lower part of the picture. This cluster is certainly worthy of being a Messier, while noticeable to the naked eye. Portable binoculars resolve its members.

IC4628 / Diffused Nebula, type E
R.A.16h 57m 08.0s (2000.0)
Dec.-40° 18' 00" (2000.0)
Apparent Size52.0×33.0'
Real Size -
Magnitude -
Other IDsGum 56, RCW 116
H12 (Cr316) / Open Cluster, type c, I 2 m
R.A.16h 56m 6.0s (2000.0)
Dec.-40° 43' 00" (2000.0)
Apparent Size40'
Real Size14 light yrs.
# of Stars -
Distance1230 light yrs.
NGC6231 / Open Cluster, type f, I 3 p
R.A.16h 54m 0.0s (2000.0)
Dec.-41° 48' 00" (2000.0)
Apparent Size15.0'
Real SizeN/A
# of Stars93



Copyright(c) 2016 by Naoyuki Kurita, All rights reserved.
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