Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1886s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 5, p. 1886-1891, 2015, 2016.
Astronomy and Astrophysics
Astronomy
4
Astronomical Photometry, Supernova 1987A, Aberration, Photographic Plates
Scientific paper
An analysis of the discovery and prediscovery plates for SN 1987A is presented. The second earliest reliable photometric measurements for the SN have found to have a B magnitude of 5.00 (+/- 0.15) on Feb.24.12 UT 1987, while for Sanduleak -69 deg 202 was found to have a B magnitude of 12.12 (+/- 0.15) on Feb 23.08 UT 1987. These discovery and pre-discovery plates represent, respectively, the second earliest reliable photometric measure for the SN and the last known observation of its precursor. The B magnitude reported here for SN 1987A is about 0.2 mag fainter than found by Shelton and Lapasset (1993) five hours later, indicating that the supernova was still rising to 'first maximum light' in the B bandpass 19 hours after the IMB/Kamiokande-II neutrino detection. Data obtained subsequent to this observation through to the third day indicates a nearly constant B magnitude.
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