Supernova 1999ac in NGC 6063

This page is devoted to information on Supernova 1999ac in NGC 6063. 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.

1999 just keeps getting better and better. 1999ac was discovered by the KAIT team at Lick Observatory. It was first reported in IAUC 7114.

Web pages dedicated to this SN.

  • AUDE has a 1999ac page [Translate]
  • M1 Supernova Search has a 1999ac images page.
  • Seiichi Yoshida has a 1999ac images page

    The following is a list of images of this SN, in chronological order. Click on the name in the "observer" column to see the image.
    If you know of any others, please tell me!
    KAIT 2/26.5/9915.2CCDDiscovery
    Larry Robinson 2/28.9/99CCD
    K. Sárneczky 2/28/99 02:40 UTCCD
    Salvo Massaro 3/1/99 03:59 UTCCD FITS Version
    DAX Observatory 3/1/99 23:01:25 UT CCD
    KenIchi Kadota
    Seiichi Yoshida
    3/4/99 02:22:25 JST 15.7CCD
    Kereszty Zsolt 3/13/99 00:08 UT 14.2CCD
    Marko Moilanen 3/14/99 1.06 UT CCD
    Robin CHASSAGNE 3/16/99 4:28 UT 13.62CCD
    D. Rodreguez 3/19/99 14.5C
    László L. Kiss 3/19/99 23:38 UT C
    J. M. Bosch 3/21/99
    S. Moretti image 3/21/99 CMarked as "1999ad"
    KenIchi Kadota
    Seiichi Yoshida
    3/23/99 04:05:39 JST 14.9C
    KenIchi Kadota
    Seiichi Yoshida
    4/1/99 03:03:37 JST 15.5C
    KenIchi Kadota
    Seiichi Yoshida
    4/5/99 03:00:31 JST 15.5C
    Pedro Ré 4/6/99 01:06 UT 15.45C
    KenIchi Kadota
    Seiichi Yoshida
    4/9/99 01:34:55 JST 16.0C
    Mobberley 4/9.94/99 C
    KenIchi Kadota
    Seiichi Yoshida
    4/14/99 02:19:47 JST 15.8C
    KenIchi Kadota
    Seiichi Yoshida
    4/15/99 01:16:35 JST 16.0C
    Rafael Ferrando image 4/17/99 15.65C
    APO image 4/17/99 8:07 UT 15.94C
    László L. Kiss 4/22.972/99 16.1C
    Juan Gonçalves
    Joăo Porto
    4/25/99 01:40 16.5C
    Juan Gonçalves
    Joăo Porto
    5/14.13/99 16.45C
    Pedro Ré image 5/24/99 23:12 UT 15.66C
    Pedro Ré image 6/4/99 0:03 UT C
    Kopernik image 6/12/99 6:04 UTC

    Light curves and Spectra:

  • Christian BUIL spectra in French [Translate]
  • VSNET Light curve (requires JAVA).
    If you have observations of this Supernova, please send them to Use this VSNet data query to see what information has been reported so far. VSNet data on this SN:
  • [ vsnet-chart 137] Chart of SN1999ac
  • [vsnet-chat 1668] Host galaxy of SN1999ac
  • [vsnet-recent 12061] SN1999ac (cont'd)
  • [vsnet-recent 17646] SN1999ac recent (cont'd)

    From [vsnet-alert 2721] SN 1999ac in NGC 6063

    Dear SN watchers,

    Another bright SN has been discovered by KAIT team. According to IAUC 7114, SN 1999ac was discovered on Feb. 26.5, and its location is R.A. = 16h07m15s.01, Decl. = +7o58'20".4 (2000.0), which is about 24" east and 30" south from the nucleus of the host Sc galaxy NGC 6063. There is some question between the coordinate and the offset (in declination), but it should be safe to say that this SN appears on the south-east edge of the spiral disk.

      Reported magnitudes are;
    19980721.2 >190C  KAIT
    19990220.5 >175C  KAIT
    19990226.5  152C  KAIT
    19990227.5  150C  KAIT
    , which indicate that this SN would be on brightening phase.
    The spectroscopy has not reported. If it is of typical type Ia SN, its peak magnitude would be around 14.5. Further monitoring is greatly encouraged.

    SN1999ac early photometry

    object    YYMMDD(UT)   mag  code
    SN1999ac  19980721.2 >190C  KAI
    SN1999ac  19990220.5 >175C  KAI
    SN1999ac  19990226.5  152C  KAI
    SN1999ac  19990227.5  150C  KAI
    Sincerely Yours,
    Hitoshi YAMAOKA, Kyushu Univ., Japan
    Back to Bright Supernovae - 1999.
    Back to Bright Supernovae.
    David Bishop
    Last modified: Fri Aug 13 17:01:01 EDT 1999