SN 1994D

SN 1994D
A dusty spiral galaxy seen close to edge-on against a black background, with a bright point of white at lower left
Hubble Space Telescope image of SN 1994D, visible at lower left
Event typeSupernova
Type Ia[1]
Datec. 55.15 million years ago
(discovered 7 March 1994 by R. Treffers)[2]
InstrumentLeuschner Observatory
ConstellationVirgo
Right ascension12h 34m 02.395s[1]
Declination+07° 42′ 05.70″[1]
EpochB2000.0
Distancec. 55.15 million ly
Redshift0.0036, 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
HostNGC 4526[2]
Progenitor typeWhite dwarf
Peak apparent magnitude+15.2
Other designationsSN 1994D, AAVSO 1229+08
Preceded bySN 1994C[3]
Followed bySN 1994E[3]
[edit on Wikidata]

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.[4] 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.[4] 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.[5]

  1. ^ a b c d e Cite error: The named reference Meikle_et_al_1996 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Treffers_et_al_1994 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference IAU_CBAT was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Lentz_et_al_2001 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Boyle_et_al_2017 was invoked but never defined (see the help page).