Around NGC7550, Abell 2572

Deep Sky Object in Autumn

Around NGC7550, Abell 2572 (Galaxy Cluster & Groups in Pegasus)

Date & Time:	Dec 4 2021, from 18:22 to 20:24 JST(+0900)
	Mosaic of 2 flames with 6min.×10shots
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

This image has captured a field around 4.5 degrees northeast of α Peg. (Marcab) that forms a southwest star of Pegasus's square. In here, we can see a galaxy cluster and two compact galaxy groups gathered in the span within a degree.
In left of the image, the galaxy cluster Abell 2572 is lying. We can detect about 30 member galaxies in the span of about 30 arc minutes. The Hickson Compact Group 94 (HCG94) positions just west of Abell 2572, contains seven tiny galaxies from HCG94A to G. We can detect dimmed lump of galaxy's light around HCG94A and B in the south of group.
More, in the upper right-hand side of image, we can see another Hickson Compact Group 93 at about 30 arc minutes WNW of HCG94. The group contains five elliptical and spiral member galaxies relatively easy to see. The distance to HCG93 has been estimated as approx. 220 million light years.

Abell 2572 / Galaxy Cluster, type 0 3 III
R.A.	23h 18m 24.0s (2000.0)
Dec.	+18°44' 00" (2000.0)
Apparent Size	28.0'
# of Galaxies	32
Red Shift	N/A
Magnitude	15.3
Distance	N/A
Galactic supercluster	-

NGC7578A / Galaxy, type S0^ pec
R.A.	23h 17m 12.0s (2000.0)
Dec.	+18°42' 03" (2000.0)
Apparent Size	1.0×0.6'
Radial Velocity	+11969km/s
Magnitude	14.3
Distance	N/A
Group of Galaxies	-
Other IDs	UGC 12477, CGCG 454-22 Arp 170, Hickson 94B MCG +3-59-24, PGC 70933

NGC7550 / Galaxy, type SA0-
R.A.	23h 15m 16.0s (2000.0)
Dec.	+18°57' 41" (2000.0)
Apparent Size	1.3×1.2'
Radial Velocity	+5101km/s
Magnitude	13.2
Distance	220 million light yrs.
Group of Galaxies	-
Other IDs	UGC 12456, CGCG 454-12 Arp 99, Hickson 93A MCG +3-59-15, PGC 70830

NGC7549 / Galaxy, type SB(s)cd pecc
R.A.	23h 15m 17.2s (2000.0)
Dec.	+19°02' 30" (2000.0)
Apparent Size	3.1×0.8'
Radial Velocity	+4688km/s
Magnitude	13.7
Distance	220 million light yrs.
Group of Galaxies	-
Other IDs	UGC 12457, CGCG 454-13 Hickson 93B, MCG +3-59-14 IRAS 23127+1846, PGC 708323

NGC7541 & NGC7537

Around NGC7556

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