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 two weeks later on March 22.[5] 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]
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abcTreffers, R. R.; Filippenko, A. V.; van Dyk, S. D.; Richmond, M. W.; et al. (1994). Green, D. W. E. (ed.). "Supernova 1994D in NGC 4526". IAU Circular. 5946: 2.
Bibcode:
1994IAUC.5946....2T.