Deep Sky Object in Autumn
HCG87 (Galaxy Group in Capricornus)


Date & Time: Oct 23 2022, from 19:43 to 20:50 JST(+0900)
Composed 6 shots with 10 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(2040×2040)
Device Size...10×10mm
Sensitivity...ISO4000, White Balance...Daylight


IDHicksonR.A.Dec.SizeMagnitude
ESO597-3687a20h 48m 14.9s-19° 50' 53"1.6×0.3'15.5
MCG-3-53-387b20h 48m 10.9s-19° 51' 20"0.7×0.6'15.5
ESO597-3587c20h 48m 11.8s-19° 49' 54"0.7×0.2'17.5
PGC6541487d20h 48m 12.9s-19° 50' 47" - -
A compact galaxy group in central region of Caricornus has a name of Hickson's Compact Group (HCG) 87. Four minor galaxies with various shapes are gathering tightly. The major one of HCG87A has a long axis of about 1.6 arc minutes and 15th magnitude in brightness. The group is about 400 millions light years away from our Galaxy, and it's estimated about 170 thousands light years in real span.
Members of HCG87
Members of HCG87		 HCG87 captured by HST
HCG87 captured by HST



HCG16
Arp 3

Copyright(c) 2022 by Naoyuki Kurita, All rights reserved.
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