SN 1994D

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

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]
Related media on Commons

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

See also

• History of supernova observation