SN 1885A

Supernova 1885
	The visual band light curve of S Andromedae, adapted from Patchett et al. (1985)
Event type	Supernova
	Type Ia
Date	c. 2.5 million years ago ; (discovered 20 August 1885 by Ernst Hartwig)
Constellation	Andromeda
Right ascension	00h 42m 43.11s
Declination	+41° 16′ 04.2′′
Epoch	J2000.0
Galactic coordinates	121.1702 -21.5741
Distance	c. 2.5 million ly
Host	Andromeda Galaxy
Colour (B-V)	+1.3 ~ +0.6
Notable features	First and only supernova observed in Andromeda; ; first extragalactic supernova observed; ; closest type Ia observed
Peak apparent magnitude	+6
Other designations	SN 1885A, HR 182, 2MASS J00424312+4116032, BD+40 147a, S And, TIC 438234291, AAVSO 0037+40, EV* M31 V0894
Preceded by	SN 1604 (observed), Cassiopeia A (unobserved, c. 1680), G1.9+0.3 (unobserved, c. 1868)
Followed by	SN 1895B
	[edit on Wikidata]

SN 1885A (also S Andromedae) was a supernova in the Andromeda Galaxy, the only one seen in that galaxy so far by astronomers. It was the first supernova ever seen outside the Milky Way,^[3] though it was not known at the time how far away it was. It is also known as "Supernova 1885".

^ Patchett, B. E.; Stickland, D. J.; Crilly, D.; Wood, R. (December 1985). "A revised light curve for the 1885 supernova in M 31". The Observatory. 105: 232–238. Bibcode:1985Obs...105..232P.
^ Cite error: The named reference devau was invoked but never defined (see the help page).
^ Frommert, Hartmut; Kronberg, Christine. "S Andromedae: Supernova 1885 in M31". SEDS Messier Database. Retrieved 2017-01-22.

[Patchett-1] Patchett, B. E.; Stickland, D. J.; Crilly, D.; Wood, R. (December 1985). "A revised light curve for the 1885 supernova in M 31". The Observatory. 105: 232–238. Bibcode:1985Obs...105..232P.

[devau-2] Cite error: The named reference devau was invoked but never defined (see the help page).

[3] Frommert, Hartmut; Kronberg, Christine. "S Andromedae: Supernova 1885 in M31". SEDS Messier Database. Retrieved 2017-01-22.

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