Deep Sky Object in Autumn
Arp 3 (Galaxy in Aquarius)


Date & Time: Sep 30 2022, from 21:13 to 22:07 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


Arp 3 / Galaxy, type SA(s)m
R.A.22h 36m 35.0s (2000.0)
Dec.-02°54' 25" (2000.0)
Apparent Size2.4×1.9'
Radial Velocity+1710km/s
Magnitude13.4
Distance60 million light yrs.
Group of Galaxies -
Other IDsMCG -1-57-16, DDO 214
PGC 69293
This image shows you a small spiral galaxy Arp 3 lurking about 2.8 degrees south of ηAqr. It has a magnitude of 13 and a size of about 2 arc minutes, classified as a dwarf galaxy called "Low surface brightness galaxy". Unlike normal galaxies, they contain almost no dense interstellar gas, making them ideal targets for dark matter research in astronomy. The distance has been estimated about 60 million light years.



HCG87
Around Arp 65

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