Deep Sky Object in Winter
Abell 548 (Galaxy Cluster in Lepus)


Date & Time: Nov 20 2020, from 25:28 to 26:25 JST(+0900)
Composed 15 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...20×20mm
Sensitivity...ISO4000, White Balance...Daylight


Abell 548 / Galaxy Cluster, type 1 1 III
R.A.05h 47m 00.0s
Dec.-25°36' 00"
Apparent Size56.0'
# of Galaxies79
Red ShiftN/A
Magnitude13.7
Distance550 million light yrs.
Supergalactic cluster -
This image shows you a comparatively larger-scaled galaxy cluster Abell 548 lurked at a bit larger than 3 arc minutes south of γ Leporis in the southern region of the constellation. The cluster has a span of about 56 arc minutes; this image has almost been occupied by the field of the cluster. Although the cluster contains about 80 member galaxies dimmer than 14th magnitude, it may difficult to distinguish them from inner-galactic stars scattered in this field. The distance to the cluster has been estimated as 550 million light years.



UGCA105
HCG21

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