Supernova 1999em in NGC 1637

This page is devoted to information on Supernova 1999em in NGC 1637 Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main main page. Information on the original web pages for many of these images can be found on the Supernova links web page.

sn99em.gif This one was a bright one. NGC 1637 is a mag 11.4 galaxy in Eridinus, close to the Orion boarder (it's not far from Rigel). It's also only about 1/3 as far away as the Virgo cluster. Supernova 1999em was caught fairly early, and could make it up to mag 11. Maximum brightness appeared to be at mag 13.1 (normalized) on or about 10/31/99. N. Fukahara finder chart

Currently there's a big debate over what photometry to use for this supernova. Three sets of reference stars have been posted, and depending on which one you use, you get a different brightness. As soon as this is straightened out, I'll try to normalize things.

Web pages dedicated to this SN.

  • AUDE has a 1999em page in French [Translate]
  • Mike Fleenor's 1999em page
  • M1 SN Search has a 1999em page in Spanish [Translate]
  • VSNet has a 1999em subpage
  • article
  • Chandra X-Ray data from 1999em
  • Finder chart with reference stars identified
  • PARG has a 1999em page
  • Trick or Treat? 1999em Chandra target of Oppertunity
  • SkyHound finder chart for 1999em
  • AAVSO talks about this SN in alert 263 which references these AAVSO finder charts
  • Seiichi Yoshida has a 1999em sub-page
  • HORKE NOVINKY Supernova 1999em in Checz.
  • Nick Suntzeff's 1999em page
  • Robin Chassagne's 1999em page in French [Translate]
  • ESO observations of 1999em
  • Dartmouth NIR light curves and spectrum
  • CTIO's SN 1999em in NGC 1637 New 9/1/00
  • Pablo Candia's animation of 1999em New 10/5/00

    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. Times and dates are in UT unless otherwise noted. If you know of any others, please tell me!
    LOSS image 10/29.44/9913.5CDiscovery
    Michelle Stone image 10/29/99C
    Nick Suntzeff image 10/30/99BVIWow! color
    M. Wischnjewsky image 10/30/99C
    CfA image 10/30/99C north up, east to the left and a 5' field of view
    Josep M. Bosch image 10/31/9913.1C mirror
    John Sanford
    J. Thorp image
    Roland Santallo image 10/31.536/9913.56C
    L. Kiss, K. Sárneczky,
    Gy. Szabó image
    Jean Marie Llapasset image 11/1.124/9913.5C
    Chandra X-Ray
    Telescope image
    11/1.276/99X-Ray Larger version
    Dr. Pedro Valde's Sada image 11/1.28/99C
    Eric Barbotin image 11/1.57/99C
    Martin P. Mobberly image 11/1.57/99C
    Pedro Ré image 11/2.96/9913.99C
    Martin Mobberley image 11/2.96/9913.99C
    Marko Moilanen, Arto Oksanen,
    and Harri Hyvönen image
    Arno van Werven image 11/3.316/99C mirror
    PARG image 11/3/99C
    Don Dillinger image 11/3/99C
    Claude Dupuy image 11/3.988/9913.7C
    S. Massaro image 11/4.032/99C
    Pepe Manteca image 11/4.042/99C
    Jean Marie Llapasset image 11/4.077/9913.5C
    Arno van Werven image 11/4.369/99Cmirror
    Michael Nezel image 11/5.083/99C
    KenIchi Kadota
    Seiichi Yoshida image
    11/5/99 2:53 JST14.1C
    Jean Marie Llapasset image 11/5.212/9913.5C
    Unknown image 11/5/99CJapanese
    Larry Robinson image 11/6/99C
    Mario Motta image 11/6/99C
    Rafael Ferrando image 11/7.021/9913.8C
    LOSS image Undatedcolor (smaller verison)
    Rob Cole image UndatedC
    Mario Hamuy image UndatedC
    Jeffrey Edmonds image UndatedC
    Ed Couture image 11/8/99C
    Stephen M. Brincat image 11/9.903/99
    Jean Marie Llapasset image 11/10.097/9913.54
    Robin Chassagne image 11/11.887/9913.4C
    Hans Dannhoff image 11/12.003/99C
    Robin Chassagne image 11/12.845/9913.33C
    KenIchi Kadota
    Seiichi Yoshida image
    11/13/99 23:11 JST14.0C
    Robin Chassagne image 11/13.897/9913.36C
    Tom Davis image 11/14.194/99C
    Shinichi Akiyama image 11/14/99C
    Robin Chassagne image 11/14.878/9913.41C
    Johannes Walter image 11/15/99C mirror
    Robin Chassagne image 11/15.883/9913.41C
    Paul Pinel image 11/15.993/9913.7C
    Pedro Re' image 11/16.263/9914.17C
    Arno van Werven image 11/17.291/99C mirror
    Pedro Re' image 11/18.065/9914.47C
    Arno van Werven image 11/18.295/99C mirror
    Pepe Manteca image 11/20/99C
    J M Llapasset image 11/21.053/9914.0
    Arno van Werven image 11/22.188/99C mirror
    Pedro Re' image 11/22.917/9914.14C
    Pedro Re' image 11/25.937/9914.17C
    Arno van Werven image 11/26.223/99C
    Ca' Bionda Obs. image 11/26.9/9914.3C
    Pedro Re' image 11/27.927/9913.95C
    Rafael Rerrando image 11/27.015/9913.9C
    Arno van Werven image 11/28.331/99C
    Th. Payet image 11/28.854/9913.5C
    Fred Ewalt image 11/29.094/9914.35C
    J M Llapasset image 11/29.110/99C
    C & B Chardonnens image 11/29.897/9913.6C
    Pedro Re' image 12/1.887/9914.5C
    Th. Payet image 12/1.970/99C
    Kopernik image 12/2.137/99C
    Arno van Werven image 12/2.222/99C
    Th. Payet image 12/2.829/99C
    Rafael Ferrando image 12/4.009/9914.1C
    A & R Leroy image 12/4.971/9914.4C
    Pedro Re' image 12/6.884/9914.26C
    Raymond Poncy image 12/6.956/99C
    Juan Gonçalves
    Joăo Porto image
    Arno van Werven image 12/7.263/99C10x30s
    Laurent Brunetto image 12/7.981/99C
    Fred Ewalt image 12/8.138/9914.60C
    Thierry Payet image 12/8.916/99C
    Beaver Meadows observatory 12/11.271/99C
    Arnaud & Roxane Leroy image 12/14.898/99C
    Raoul Behrend image 12/17.026/9914.6V
    Arnaud & Roxane Leroy image 12/21.913/99C
    Arno van Werven image 12/25.256/99C10x30s
    K. Sárneczky, L. Kiss
    K. Sziládi image
    Pedro Re' image 1/2.823/0014.26C
    Yasuo Sano image 1/4.523/0013.5C
    R Chassagne image 1/4.841/0013.6C
    Brendan Downs image 1/5/00C
    Arno van Werven image 1/7.226/00C10x30s
    Claude Dupuy image 1/09.844/00C
    JM Llapasset image 1/11.842/0013.5R
    Pedro Re' image 1/12.828/0013.71C
    JM Llapasset image 1/12.832/0014.1V
    R Chassagne image 1/15.813/0013.54C
    Anton Spenko image 1/26/00C mirror
    Rok Palcic image 1/27.85/00C
    KenIchi Kadota and
    Seiichi Yoshida image
    1/30/00 18:47 JST14.5C
    R Chassagne image 2/2.808/0013.43C
    JM Llapasset image 2/4.800/00C
    KenIchi Kadota and
    Seiichi Yoshida image
    2/5/00 20:17 JST14.2C
    KenIchi Kadota and
    Seiichi Yoshida image
    2/12/00 19:34 JST14.6C
    Fred Ewalt image 2/22.062/0015.36C
    Pedro Ré image 2/23.897/0014.87C
    R Chassagne image 2/24.713/0014.6CR
    Pedro Ré image 2/29.833/0015.28C
    Fred Ewalt image 3/1.026/0015.95C
    Unknown image 3/1.922/0015.5CR
    JM Llapasset image 3/5.839/0015.5CR
    M Serrau image 3/6.845/0015.5CR
    JM Llapasset image 3/10.819/0015.6CR
    L.Kiss, K. Sziládi,
    K. Sárneczky image
    Robin Chassagne image 4/1.838/00C
    Solar Conjunction-----
    LOSS image 8/25.5/00R
    Tim Puckett image 8/30.4/0017.6C
    Remanzacco Observatory image 9/8.21/00C
    Cedric Leyrat image 10/26.949/0019.5C
    Cedric Leyrat image 10/31.894/0019.6C

    Light curves and Spectra:

  • NOAO/IRAF Spectrum 10/30.220/99
  • Nick Suntzeff light curve
  • AUDE has "C" or no filter light curve, "V" filter light curve, "R" filter light curve, and "I" filter light curve Relinked 2/22/00.
  • CfA Spectrum Taken 10/31.260/99 Showing a very early type II
  • CfA Spectrum taken Nov 4, 1999, shows the type-II SN 1999em with Hydrogen lines becoming more prominent
  • 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. Other VSNet data on this SN:
  • [vsnet-alert 3639] SN 1999em in NGC 1637
  • [vsnet-alert 3640] SN 1999em in NGC 1637
  • [vsnet-alert 3641] Re: SN 1999em in NGC 1637
  • [vsnet-alert 3642] SN1999em, available potometry
  • [vsnet-alert 3643] Re: SN 1999em in NGC 1637
  • [vsnet-alert 3649] SN 1999em observation
  • [vsnet-alert 3650] SN1999em early photom
  • [vsnet-alert 3651] SN1999em early photom
  • [vsnet-chat 2379] SN1999em sequence problem
  • [vsnet-chat 2380] Re: SN1999em sequence
  • [vsnet-chat 2381] SN 1999em sequence problem
  • [vsnet-chat 2382] sn1999em field photometry
  • [vsnet-chat 2383] Re: sn1999em field photometry
  • [vsnet-chat 2384] sn1999em field photometry
  • [vsnet-alert 3656] SN 1999em observation
  • [vsnet-alert 3657] Re: SN1999em sequence
  • [vsnet-alert 3658] Sequence for SN 1999em
  • [vsnet-alert 3659] Correction on the seq
  • [vsnet-chat 2385] SN1999em magnitude discordance
  • [vsnet-chat 2386] Re: SN1999em magnitude discordance
  • [vsnet-chat 2387] Re: SN1999em sequence problem
  • [vsnet-chat 2389] sn1999em field photometry
  • [vsnet-chat 2390] Sequence for sn1999em
  • [vsnet-chat 2399] sn1999em field photometry and sequence
  • [vsnet-alert 4252] SN 1999em fading

    Latest Photometry:

  • [vsnet-recent 39999] SN1999em recent (cont'd)
  • [vsnet-recent 40317] SN1999em recent (cont'd)
  • [vsnet-recent 42918] SN1999em recent (cont'd)
  • [vsnet-recent 43533] SN1999em recent (cont'd)
  • [vsnet-recent 44895] SN1999em recent (cont'd)
  • [vsnet-recent 45576] SN1999em recent (cont'd)
  • [vsnet-recent 47207] SN1999em recent (cont'd)
  • [vsnet-recent 49282] SN1999em recent (cont'd)
  • [vsnet-recent 51164] SN1999em recent (cont'd)
  • [vsnet-recent 52548] SN1999em recent (cont'd)
  • [vsnet-recent 53109] SN1999em recent (cont'd)
  • [vsnet-recent 60458] SN1999em recent (cont'd)
  • [vsnet-recent-sn 104] SN1999em recent (cont'd)
  • [vsnet-recent-sn 293] SN1999em recent (cont'd)
    Back to Bright Supernovae - 1999
    Back to Bright Supernovae.
    David Bishop
    Last modified: Mon Dec 3 15:18:06 EST 2001