Deep Sky Object in Spring
Arp 148 (Galaxy in Ursa Major)


Date & Time: Jun 17 2023, from 22:22 to 23:04 JST(+0900)
Composed 8 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(2040×2040)
Device Size...10×10mm
Sensitivity...ISO4000, White Balance...Daylight


Arp 148 / Galaxy, type Ring
R.A.11h 03m 53.9s (2000.0)
Dec.+40°51' 00" (2000.0)
Apparent Size0.5×0.3'
Radial Velocity+10357km/s
Magnitude15.4
Distance450 million light yrs.
Group of Galaxies -
Other IDsMCG +7-23-19, PGC 33423
Arp 148 is a faint collision galaxy located approximately 3.8 degrees SSW of ψUMa. The galaxy is known as "Mayall's Object" named after its discoverer, floating at a distance of about 450 million light-years. It is believed that two galaxies collided, forming a ring-shaped galaxy with a tail extending to the east. Due to its span of only 0.5 arc minutes, capturing the faint shape is quite challenging. However, a sharp image taken by the Hubble Space Telescope has been released, it has gained relatively more recognition and popularity.

Arp 148 captured by HST Arp 148 (Mayall's Object) captured by HST
© STScI-HST



Ursa Minor Dwarf
Abell 569

Copyright(c) 2023 by Naoyuki Kurita, All rights reserved.
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