SN 1994D

SN 1994D was a Type Ia supernova event in the outskirts of galaxy NGC 4526, which was observed in 1994.

SN 1994D

Hubble Space Telescope image of SN 1994D, visible at lower left
Event type	Supernova
Type Ia[1]
Date	c. 55.15 million years ago (discovered 7 March 1994 by R. Treffers)[2]
Instrument	Leuschner Observatory
Constellation	Virgo
Right ascension	12h 34m 02.395s[1]
Declination	+07° 42′ 05.70″[1]
Epoch	B2000.0
Distance	~55.15 million ly
Redshift	0.0036, 0.0001, −0.0001, 0.0021, 0.0023, 0.0022, 0.0008, 0.0005, 0.0013, 0.0017, 0.0004, 0.0024, 0.0011, 0.0012, 0.0002
Host	NGC 4526[2]
Progenitor type	White dwarf
Peak apparent magnitude	+11.9[3]
Other designations	SN 1994D, AAVSO 1229+08
Preceded by	SN 1994C[4]
Followed by	SN 1994E[4]
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Observation

Light curves in four photometric bands for SN 1994D, adapted from Richmond et al. (1995)^[3]

It was offset by 9.0″ west and 7.8″ south of the galaxy center and positioned near a prominent dust lane.^[1] It was caused by the explosion of a white dwarf star composed of carbon and oxygen.^[5] This event was discovered on March 7, 1994 by R. R. Treffers and associates using the automated 30-inch telescope at Leuschner Observatory.^[2] It reached peak visual brightness, magnitude 11.9, two weeks later on March 22.^[5][3] Modelling of the light curve indicates the explosion would have been visible around March 3-4. A possible detection of helium in the spectrum was made by W. P. S. Meikle and associates in 1996.^[1] A mass of 0.014 to 0.03 M_☉ in helium would be needed to produce this feature.^[6]

See also

• History of supernova observation