Arp 299

Arp 299 (parts of it also known as IC 694 and NGC 3690) is a pair of colliding galaxies approximately 134 million light-years away in the constellation Ursa Major. Both of the galaxies involved in the collision are barred irregular galaxies. NGC 3690 was discovered by German-British astronomer William Herschel on 18 March 1790.^[1][2]

Arp 299
Arp 299 with NGC 3690 (left) & IC 694 (right), imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Ursa Major
Right ascension	11h 28m 33.13s
Declination	+58° 33′ 58.0″
Redshift	0.010
Distance	130 Mly
Apparent magnitude (V)	11
Characteristics
Type	SBm pec. / IBm pec.
Apparent size (V)	2.4′ × 1.9′
Notable features	interacting galaxies
Other designations
IC 694, NGC 3690, VV 118, Mrk 171

It is not completely clear which object is historically called IC 694. According to some sources, the small appendage more than an arcminute northwest of the main pair is actually IC 694, not the primary (eastern) companion.^[3][4]

The interaction of the two galaxies in Arp 299 produced young powerful starburst regions similar to those seen in II Zw 96.^[5]

Supernovae

Since 1992, fifteen supernovae have been detected in Arp 299:

Host	Supernova	Type	Magnitude
NGC 3690	SN 1992bu[6]	unknown	16.6
NGC 3690	SN 1993G[7]	Type II	16.6
NGC 3690	SN 1998T[8]	Type Ib	15.4
NGC 3690	SN 1999D[9]	Type II	15.6
NGC 3690	SN 2018lrd[10]	Type Ib	17.1
NGC 3690	AT 2018mel[11]	Unknown	16.5
NGC 3690	SN 2019lqo[12]	Type II	18.3
NGC 3690	SN 2020fkb[13]	Type Ib	17.8
NGC 3690	SN 2022gnp[14]	Type Ib	17.7
NGC 3690	SN 2023wrk[15]	Type Ia	18.1
NGC 3690	SN 2024gzk[16]	Type IIb	17.8
NGC 3690	SN 2024agfq[17]	type IIn	19.05
IC 694	SN 2005U[18]	Type II	16.2
IC 694	SN 2010O[19][20][21]	Type Ib	15.6
IC 694	SN 2010P[22]	Unknown	18.3

See also

• Antennae Galaxies
• Mice Galaxies