SN2001ds – discovery

Tom Boles

SN2001ds in UGC 1654, discovered 2001 August 14. IAU Circular 7684 : The Central Bureau has received reports that independent discoveries have been made of a new supernova in UGC 1654 by T. Boles, Coddenham, England (via G.M. Hurst, Basingstoke, England), on unfiltered CCD images taken for the UK Nova/Supernova Patrol on Aug. 14.999 (mag. 16.2) and 16 UT (mag. 16.6), and by LOTOSS (cf. IAUC 7514; via D.J. Hutchings and W.D. Li, University of California at Berkeley) on unfiltered CCD images taken with the Katzman Automatic Imaging Telescope (KAIT) on Aug. 16.5 and 17.4 (mag. about 18.3). M. Armstrong, Rolvenden, England, also obtained a confirming image on Aug. 16.972. The LOTOSS position for SN 2001ds is RA 2h 10m 08s.73, Dec +36º 42' 20".3 (equinox 2000.0), which is 4".1 west and 3".6 north of the nucleus of UGC 1654. A KAIT image taken on Jan. 17.2 showed nothing at this position (limiting mag. about 19.0). Boles’ position end figures, averaged from frames on two nights, are 08s.80, 20".1, or 5".0 west and 3".5 north of the galaxy’s nucleus. SN2001ds is absent from an image taken by Boles on 1999 Dec. 4.941 (limiting mag. 18.0) and from Palomar Sky Survey images taken in 1954, 1989 and 1992.