Deep Sky Object in Autumn
Abell 2666 (Galaxy Cluster in Pegasus)


Date & Time: Dec 28 2024, from 20:42 to 21:36 JST(+0900)
Composed 10 shots with 6 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(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight


Abell 2666 / Galaxy Cluster, type 0 1 I
R.A.23h 50m 54.0s (2000.0)
Dec.+27°08' 00" (2000.0)
Apparent Size78.4'
# of Galaxies34
Red Shift0.026
Magnitude13.8
Distance358 million light yrs.
Galactic supercluster -
NGC7768 / Galaxy, type E
R.A.23h 50m 58.7s (2000.0)
Dec.+27°08' 54" (2000.0)
Apparent Size1.4×1.0'
Radial Velocity+8191km/s
Magnitude13.6
Distance358 million light yrs.
Group of GalaxiesAbell 2666
Other IDsUGC 12806, CGCG 477-19
MCG +4-56-18, PGC 72605
This image captures a small galaxy cluster hidden within the Great Square of Pegasus. It is located 4.3 degrees southwest of α Andromedae (Alpheratz), the northeastern star of the square. The cluster contains over 30 galaxies within an area of just under 80 arcminutes. At its center lies NGC 7768, the brightest member, which is an elliptical galaxy with a major axis of 1.4 arcminutes. The distance to Abell 2666 is estimated to be approximately 350 million light-years.
Numbers with 4 digits represent NGC #



Abell 2634
HCG10

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