Deep Sky Object in Spring
Abell 1139 (Galaxy Cluster in Leo)


Date & Time: Dec 28 2025, from 26:38 to 27:32 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 1139 / Galaxy Cluster, type 0 3 III
R.A.10h 58m 06.0s (2000.0)
Dec.+01°29' 00" (2000.0)
Apparent Size33.6'
# of Galaxies36
Red Shift0.0398
Magnitude15.0
Distance534 million light yrs.
Galactic superclusterLeo Supercluster
This is a galaxy cluster located in the southern part of Leo, near the border with Sextans. It can be found about 7.4° southwest of σLeo, which marks the tip of Leo's hind leg. Because the cluster lies at a distance of more than 500 million light-years, the individual galaxies are faint and poorly resolved, but a little over 30 galaxies are concentrated within an area about 30 arcminutes across. It belongs to the Leo Supercluster.



Abell 754
Abell 1142

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