Deep Sky Object in Spring
Abell 1185 (Galaxy Cluster in Ursa Major)


Date & Time: Feb 22 2020, from 23:52 to 24:47 JST(+0900)
Composed 10 shots with 6 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 1185 / Galaxy Cluster, type 1 2 II
R.A.11h 10m 48.0s
Dec.+28° 40' 00"
Apparent Size28.0'
# of Galaxies52
Red Shift0.0313
Magnitude14.3
Distance430 million light yrs.
Galactic superclusterLeo supercluster
Abell 1185 is a small-scaled galaxy cluster positioned at a boundary between Ursa Major and Leo. The cluster is about 430 millions light years away, contains about 50 member galaxies in 30 arc minutes in apparent diameter. Members with NGC numbers are about 14th magnitude or so in brightness.
You can see a galaxy pair of NGC3561 and 3561A in northeast edge of the cluster, the pair has been warped by their interaction. A tail-like structure is stretched in northern direction from NGC3561A. We have a number of Arp105 of peculiar galaxies in this minor galaxy pair.
Numbers with 4 digits represent NGC #



Abell 779
Around Abell 1616

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