Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..394y&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Astronomy and Astrophysics
Astronomy
Scientific paper
The astrometric informations of the extragalactic supernovae are quite important for researching the nature of them. For example, it has been proposed that there are some relationships between the luminosities of SNe Ia and the distances from the nuclei of the host galaxies, thus the chemical compositions of the progenitors. The precise positions are also desired for the follow-ups and the future observations of their remnants. The coordinates provided around the discoveries are, however, sometimes erroneous, and also are the cataloged positions because there are scarce additional informations about the positions. Here I will give the precise coordinates of bright supernovae in recent years based on GSC-ACT or such recently-developed star catalogs, including the extreme cases of SN 1998T ( IAU Circ. 6859) and SN 1999et ( IAU Circ. 7344). The standard deviations of the positions are expected to be sub-arcsecond order, which can be better than the offsets from the ambiguous nuclei of the host galaxies.
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