SN 1994D
Type Ia supernova in Virgo
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SN 1994D was a Type Ia supernova event on the outskirts of galaxy NGC 4526, which was observed in 1994.
(discovered 7 March 1994 by R. Treffers)[2]
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 | |
Observation
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]
