Deep Sky Object in Winter
NGC2539 (Open Cluster in Puppis)


Date & Time: Nov 20 2020, from 26:44 to 27:25 JST(+0900)
Composed 6 shots with 8 minutes exposed
Optical: TAKAHASHI 12.5cm(4.9") fluorite refractor with conversion lens (f=700mm, F5.6)
Auto-guided with VIXEN ATLUX Equatorial & ZWO ASI174MC + PHD2
Digital Camera: Canon EOS 550D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
CCD Sensitivity...ISO800


NGC2539 / Open Cluster, type III 2 m
R.A.08h 10m 38.0s (2000.0)
Dec.-12°49' 12" (2000.0)
Apparent Size21.0'
Real Size27 light yrs.
# of Stars50
Magnitude6.5
Distance4400 light yrs.
Other IDsCr 176, Mel 83
NGC2539 is a medium-scaled open cluster positioned near the northeast edge of Puppis in lower wintry south skies. Perhaps you can find out the cluster by tracing 8 degrees southeast from α-Monocerotis in the northern nearby constellation. The cluster has a span of about 20 arc minutes; you can detect 50 fine member stars gathered tightly through small scopes. A bright 4.7th magnitude stars has positioned in southeast side of the cluster being a good accent for appreciation of this minor object. The distance from the solar system has been estimated as about 4400 light years.



NGC2451, NGC2477
The Hyades (Mel.25)

Copyright(c) 2020 by Naoyuki Kurita, All rights reserved.
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