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Supernova 1998eg in UGC 12133

Supernova 1998eg in UGC 12133

This page is devoted to information on Supernova 1998eg in UGC 12133. Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main supernova page. Information on the original web pages for many of these images can be found on the Supernova links web page.

My basic rule of thumb is that if I get more than 6 images of a specific Supernova I usually create a web page to index these images. This usually only happens for "bright" SN. However, 1998eg would not normally fall into that catagory. As 1998eg happened in a drought of very few bright SN it may have been shot a little more than normally would have happened.

Web pages dedicated to this SN.

  • "The Astronomer" magazine has a 1998eg page.

    The following is a list of images of this SN, in chronological order.
    If you know of any others, please tell me!

  • G. Sala image 10/19/98
  • Tom Boles images 10/19/98
  • Tom Boles images Undated
  • Spaceguard Canada image 10/21/98 06:00 UT
  • Y. Sano image 10/21/98 08:00 UT
  • L. Kiss image 10/26/98
  • Mike Schwartz image 10/27/98
  • Larry Robinson image 10/27/98 1:15:21 UT
  • Salvo Massaro image 10/29/98 21:32 U.T. (in FITS format)
  • S. Massaro and P. Passalacqua image Undated.
    Dear SN watchers,

    Successively to SN 1998ef, a supernova has discovered which is brighter than it is expected from the recession velosity of the host. According to IAUC 7033, English amateur Tom Boles has discovered a supernova 1998eg in UGC 12133. It is located at R.A. = 22h39m30s.26, Decl. = +8 36'21".3 (2000.0), which is about 26" west and 25" south from the nucleus of the host edge-on spiral galaxy UGC 12133. The new star locates on the thin disk, and the star at the northwest from the nucleus is a foregroud star. Spectroscopic confirmation has not been reported yet. Note that this galaxy had produced another SN II 1990Z (about 19 mag).

    The SN 1998eg images are accessable at: http://astrowww.phys.uvic.ca/~balam/sn97do.html (D. Balam) ftp://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/SNe/sn1998eg/u12133-1.jpg (Y. Sano)

    Finding chart based on USNO A1.0 are available at: http://www.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00111.html

    The host galaxy is a further one. Estimated with its recession velocity, typical SNeIa on this galaxy would be expected to be 16.7 mag or so on their maximum (vsnet-chat 1400). However, the early photometries of this SN, 

      Sept.17     >18
  Oct. 19.896  15.7C  M. Armstrong
  Oct. 19.906  16.0C  T. Boles (discovery image)
  Oct. 20.88   16.4:R S. Benetti et al, La Palma
  Oct. 20.995  15.5C  M. Armstrong
  Oct. 21.25   17.6R  D. Balam
  Oct. 21.385  16.2C  Y. Sano
    show already brighter magnitudes than expected. As same as the case of SN 1998ef, it can be caused by the error of the distance, but it is possible that this SN 1998eg is intrinsically bright one, or something with unknown nature. I have checked the BATSE trigger, but no gamma-ray event has detected around this galaxy since September. Further magnitude estimates are strongly encouraged.

    Sincerely Yours,
    Hitoshi Yamaoka, Kyushu Univ., Japan
    yamaoka@rc.kyushu-u.ac.jp

    Back to Bright Supernovae.
    David Bishop
    Last modified: Fri Apr 9 12:19:14 EDT 1999