Arp 146

Arp 146 (known as PGC 509 and PGC 510) are a pair of interacting galaxies located 1.05 billion light-years away from Earth in the Cetus constellation.^[1][2][3] It was discovered by Dewhirst and catalogued by Boris Vorontsov-Velyaminov as VV 790.^[4] Under the Atlas of Peculiar Galaxies created by Halton Arp, they are categorized under galaxies that have associated rings.^[5]

Arp 146
Observation data (J2000.0 epoch)
Constellation	Cetus
Right ascension	00h 06m 44.4s
Declination	−06° 38′ 09.0″
Redshift	0.075440
Heliocentric radial velocity	22,616 km/s
Distance	1.05 Gly
Characteristics
Type	RING
Other designations
PGC 509 and PGC 510, Arp 146, VV 790

Arp 146 is classified as an example of an empty ring galaxy.^[6][7] According to a study, one galaxy appears to have passed through another, leaving behind a ring formed from the bridge material and remnants of the nucleus.^[8] The ring is said to be 18"x11" elliptical measuring 20 kpc in diameter but separated from its companion.^[4]