Astrometry of SN 1987A and SK -69.202 deg

Details Astrometry of SN 1987A and SK -69.202 deg Astrometry of SN 1987A and SK -69.202 deg

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95...58g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, Jan. 1988, p. 58-62. NSF-supported research.

Astronomy and Astrophysics

Astronomy

8

Astrometry, Astronomical Photometry, Supernova 1987A, Magellanic Clouds, Position Indicators, Supergiant Stars

Scientific paper

The position of SN 1987A has been determined relative to ≡30 Perth 70 stars using two sets of astrometric plates (epochs 1987.2 and 1973.0) and a secondary reference system comprised of LMC members. The SN position is α = 5h35m49s.970±0s.005, δ = -69°17arcmin57arcsec.92±0arcsec.03 (equinox 1950). The positional coincidence of the SN and Star 1 of Sanduleak -69°202 is confirmed to within an uncertainty of ±0arcsec.13 in each coordinate, where the uncertainty is primarily due to the error in the "progenitor" position. The relative brightness of the two major components of Sk -69°202 has been determined by fitting the density profiles of the blended images. The magnitude difference between Star 1 (the proposed SN progenitor) and the fainter Star 2 is found to be 1.4 in V and 0.7 in B. These last values differ from previously published measurements, raising the question of the possible variability of Star 2.

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