Deep Sky Object in Summer
Cr359 (Open Cluster in Ophiuchus)


Date & Time: May 3 2019, from 24:32 to 25:07 JST(+0900)
Composed 12 shots with 3 minutes exposed
Optical: AF zoom-Nikkor 80-200mm F2.8ED (f=105mm, stop: F4.0)
with IDAS LPS-P2-FF & Kenko PRO Softon[A] filters
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS 550D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO1600


Cr359 / Open Cluster, type IV 3 m
R.A.18h 01m 06.0s (2000.0)
Dec.+02°54' 00" (2000.0)
Apparent Size240.0'
Real SizeN/A
# of Stars -
Magnitude3.0
DistanceN/A
You can see a characteristic V-shaped asterism at about 4 degrees east of beta Ophiuchi. The stars has been classified as a sparse open cluster of Cr359. Our naked eyes can easily detect the cluster; a compact binocular is sufficient to enjoy it.
Once the open cluster formed the face of minor constellation of "Taurus Poniatovii". The constellation was named to honor Stanislaus Poniatowski, king of Poland and established in 1777. Presently the constellation has been abolished; the field is divided in territories of Ophiuchus, Serpens and Aquila.



IC4756, NGC6633
Cr399

Copyright(c) 2019 by Naoyuki Kurita, All rights reserved.
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