W.-d. Li, University of California at Berkeley, forwards a report from C. Li, Beijing Astronomical Observatory (BAO), that Zhou Wan has found an apparent supernova (unfiltered mag 15.2) on CCD images obtained with the 0.60-m BAO telescope on Mar. 3 UT as part of the BAO Supernova Survey (cf. IAUC 6612). A confirming CCD observation made with the Katzman Automatic Imaging Telescope (KAIT) of Lick Observatory by the Lick Supernova Survey (cf. IAUC 6627) indicates that the object has brightened to unfiltered mag about 13.5 on Mar. 4.3 UT. SN 1998S is located at R.A. = 11h46m06s, Decl. = +47o29'.0 (equinox 2000.0; based on the KAIT image), which is 16" west and 46" south of the nucleus of NGC 3877. As the object is embedded in the galaxy, the BAO magnitude was obtained from a subtracted image. SN 1998S is not present in images of the same field taken prior to Mar. 3. A. V. Filippenko and E. C. Moran, University of California at Berkeley, obtained a very-high-resolution (0.015 nm) echelle spectrogram of SN 1998S on Mar. 4 with the Keck-1 telescope. The probable presence of broad H-alpha emission superposed on a featureless continuum suggests that this is a type-II supernova.
International Astronomical Union Circular
- Pub Date:
- March 1998