Arp 299 (parts of it are also known as IC 694 and NGC 3690) is a pair of colliding galaxies approximately 134 million

light-year A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...

s away in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Ursa Major Ursa Major (; also known as the Great Bear) is a constellation in the northern sky, whose associated mythology likely dates back into prehistory. Its Latin name means "greater (or larger) bear," referring to and contrasting it with nearby Ursa ...

. Both of the galaxies involved in the collision are barred irregular galaxies. 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. The interaction of the two galaxies in Arp 299 produced young powerful

starburst region A starburst is an astrophysical process that involves star formation occurring at a rate that is large compared to the rate that is typically observed. This starburst activity will consume the available interstellar gas supply over a timespan that ...

s similar to those seen in II Zw 96. Nine

supernovae A supernova is a powerful and luminous explosion of a star. It has the plural form supernovae or supernovas, and is abbreviated SN or SNe. This transient astronomical event occurs during the last evolutionary stages of a massive star or when a ...

have been detected in Arp 299: SN 1992bu, SN 1993G, SN 1998T, SN 1999D, SN 2020fkb, SN 2022gnp were observed in NGC 3690 while SN 2005U, SN 2010O and SN 2010P were observed in IC 694.2010O
in NGC 3690 (David Bishop)

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* * * Interacting galaxies Barred irregular galaxies Peculiar galaxies Luminous infrared galaxies Ursa Major NGC objects IC objects

299 __NOTOC__ Year 299 (Roman numerals, CCXCIX) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Diocletian and Maximian (or, l ...

Markarian galaxies {{galaxy-stub

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