Supernova 1987A
Right ascension: 5:35:50.2 Magnitude: 4.8
Declination: -69:17:59
Image: LWP 10191
Date: 1987 Feb 24 23:22 UT (large aperture)
23:27 UT (small aperture)
Exposure duration: 1.3 sec (large aperture)
5 sec (small aperture)
Image: SWP 30376
Date: 1987 Feb 24 20:53 UT (large aperture)
20:58 UT (small aperture)
Exposure duration: 10 sec (each aperture)
Supernova 1987A was the closest supernova since the invention of the telescope
in the early 1600s. It was produced by the core collapse and rebound of the
blue supergiant star Sanduleak -69° 202 in the Large Magellanic Cloud, a
companion galaxy about 160,000 light-years away. 1987A was discovered by
observers at Cerro Tololo Inter-American Observatory in Chile; short wavelength
spectra were obtained by IUE only 17 hours after discovery, and long wavelength
spectra were taken two hours later. Spectra were taken through both apertures
for each wavelength range, producing two spectra per image. The broad
absorption around 1700 Å is due to triple-ionized carbon (C IV), while
that near 2600 Å is from singly-ionized magnesium (Mg II). The Doppler
shift of the Mg II feature from its expected position indicates that the shell
of material thrown off by 1987A was moving at about 36,000 km/s, about 12% the
speed of light.
Last updated: 08 April 1998
Obtained from IUE project at Goddard Space Flight Center