Deep Sky Object in Spring
HCG40 (Compact Galaxy Group in Hydra)


Date & Time: Feb 20 2021, from 24:53 to 25:38 JST(+0900)
Composed 10 shots with 4 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow 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(4080×4080)
Device Size...10×10mm
Sensitivity...ISO4000, White Balance...Daylight


HCG40 / Compact Galaxy Group
R.A.09h 38m 55s (2000.0)
Dec.-04° 51' 06" (2000.0)
Apparent Sizeabout 3.0'
Radial VelocityN/A
Magnitude-
Distance300 million light yrs.
Group of Galaxies-
Other IDs-
This image shows you a very minor celestial object positioning at the boundary between Hydra and Sextans. The heavens contain many small scaled galactic group with their members crowded dense. Those kinds of objects are called "Compact Galaxy Group". This image has captured one of such objects registered in "Hickson Compact Group", called HCG40. The distance has been estimated about 300 millions light years. You can detect small five member galaxies cuddling close together. And this group has selected in one of first-light objects of Subaru telescope in Hawaii, opened to the public in 1999.


Member Galaxies in HCG40
Number of HCGID NumberSizeMagnitude
HCG40AMCG-1-25-91.4×1.1'14.5
HCG40BMCG-1-25-101.1×0.7'14.3
HCG40CMCG-1-25-81.1×0.3'15.2
HCG40DMCG-1-25-120.8×0.4'15.5
HCG40EMCG-1-25-110.7×0.3'15.9



Shapley8(Abell3558)
Arp 248

Copyright(c) 2021 by Naoyuki Kurita, All rights reserved.
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