Supernova 2004et in NGC 6946

This page is devoted to information on Supernova 2004et in NGC 6946.   Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page.  Information on the original web pages for many of these images can be found on the updates and links web pages.

sn04et_i.jpg Discovered by Stefano Moretti (Italy) during an almost full moon.   Our second brightest SN of the year, this one is another type II.   The host galaxy NGC 6946 has been the host of 7 other supernovae, making it the most prolific supernova producer.   An image taken by Yasuo Sano on 2004/09/19.665 shows nothing at this location.   This supernova first showed up on a TAROT Telescope image taken on 2004/09/22.983 at Mag 15.17R, by 2 days later it had brightened to Mag 12.7, which pinpoints this as very near the date of the explosion.   We have a DSS Photometry reference image made by Odd Trondal.  Icon generated from James R. Foster's image.  This supernova is in the Constellation Cepheus very near the border with Cygnus.

The following is a list of images of this SN, in chronological order. Click on the name in the "Image Credit" column to see the image. Times and dates are in UT unless otherwise noted. If you know of any others, please tell me!
Image CreditDateMagFilterComments
Jørgen Albertsen image 2004/09/25.06312.9CPrediscovery
Stefano Moretti image 2004/09/27.84512.8CDiscovery, mirror
Stefano Moretti image 2004/09/28.78912.8CConfirmation
King's University College Obs image 2004/09/29C
Carsten Arnholm image 2004/09/29.79212.7Clarger version
Lode Stevens image 2004/09/29.858Ccolor
Ole Nielsen image 2004/09/29.87812.4CR
O. Thizy image 2004/09/29.960C
Odd Trondal image 2004/09/29.96112.3CRmirror, mirror
JM Llapasset image 2004/12/05.73413.1V
Carsten Arnholm image 2004/09/30.04612.7CRlarger version
Robin Leadbeater image 2004/09/3012.8C
Diego Rodriguez image 2004/09/30.85612.35CR
Yasuo Sano image 2004/09/30.58512.83CR
H. G. Lindberg image 2004/09/30.83712.7CR
Tom How image 2004/09/30.875C web page
CCCP image 2004/10/01color
Albert Saikaley image 2004/10/01CAnimated GIF
Jürgen Wolf and
Dietmar Lilienthal image
Rafael Ferrando image 2004/10/01.80012.8CR
Josep M. Bosch image 2004/10/01.8412.6Rc
Gerardo Jiménez image 2004/10/01.97712.7C
David Nash image 2004/10/02.062Ccolor
JM Llapasset image 2004/10/02.08312.9CR
JM Llapasset image 2004/10/02.06912.9R
JM Llapasset image 2004/10/02.07612.7V
Kevin B. Alton image 2004/10/02.117C
Doug Wheeland image 2004/10/02C color reference
Raymond Poncy image 2004/10/03.77012.8C
Paolo Corelli image 2004/10/03.84612.7C
Dave Harper image 2004/10/04.02012.7Ccolor, BW version, Photometry version
Joaquin Ferreiros image 2004/10/04.02112.7V
Günther Eder image 2004/10/0412.4C
Vince Tuboly image 2004/10/04.778C
Martin Mobberley image 2004/10/04.82512.9Ccolor version, web page
Peter Vasey image 2004/10/04.844Ccolor
Jeremy Shears image 2004/10/04.871C
Nick James image 2004/10/04.889C
Diego Rodriguez image 2004/10/04.98812.84CR
Günther Eder image 2004/10/0512.5C
Günther Eder image 2004/10/0612.6CR
Maurice Gavin image 2004/10/06.805C mirror
Al Ureles image 2004/10/06.896C
Günther Eder image 2004/10/0712.6CR
John Sanford image 2004/10/08.250C
Tom W. Harrison image 2004/10/08C
Job Geheniau image 2004/10/09.95812.7C
Torbjørn Fredriksen image 2004/10/09.80412.6C
Joel Nicolas image 2004/10/10.81212.86CR
Buczynski image 2004/10/10.820C
Joel Nicolas image 2004/10/10.82312.50V
Joel Nicolas image 2004/10/10.83412.84R
Joel Nicolas image 2004/10/10.84313.25B
Günther Eder image 2004/10/11.76512.8C
Hans Dannhoff image 2004/10/11.83812.38LRGB
Iiro Sairanen image 2004/10/11.951Cdrawing
Diego Rodriguez image 2004/10/12.86312.46CR
James Foster image 2004/10/13.0LRGBcolor, Wow! local mirror
Tom McMahon image 2004/10/13.17512.9C
Kopernik image 2004/10/13.25712.65
Steve Holak image updatedC
JM Llapasset image 2004/10/13.77112.8CR
JM Llapasset image 2004/10/13.77512.8R
JM Llapasset image 2004/10/13.78212.7V
Rodrigo Losada image 2004/10/16.81212.7C mirror
A. Sucker image 2004/10/16.86112.75V
Arnaud Leroy image 2004/10/16.87012.8CR
Martin Mobberley image 2004/10/18.83313.0C mirror
Stanford University image 2004/10/21.25012.8C BW version
JM Llapasset image 2004/10/22.79613.0Ic
JM Llapasset image 2004/10/22.80212.9R
JM Llapasset image 2004/10/22.80812.8V
JM Llapasset image 2004/10/26.79912.9CR
JM Llapasset image 2004/10/26.80212.9R
JM Llapasset image 2004/10/26.81012.8V
JM Llapasset image 2004/10/26.81813.0I
JB DeVanssay image 2004/10/26.96512.89CR
Arnaud Leroy image 2004/10/30.86813.07R
JM Llapasset image 2004/11/02.87213.0Ic
JM Llapasset image 2004/11/02.87712.9R
JM Llapasset image 2004/11/02.88212.9V
JM Llapasset image 2004/11/05.90712.94R
JM Llapasset image 2004/11/05.91212.89V
JM Llapasset image 2004/11/05.92213.0Ic
Diego Rodriguez image 2004/11/08.81912.95CR
JM Llapasset image 2004/11/11.73713.0CR
JM Llapasset image 2004/11/11.73813.0Ic
JM Llapasset image 2004/11/11.74012.95R
JM Llapasset image 2004/11/11.74512.92V
Buczynsk image 2004/11/12.829C
Josep M. Bosch image 2004/11/13.84012.7Rc
JM Llapasset image 2004/11/17.76313.0Ic
JM Llapasset image 2004/11/17.76713.0R
JM Llapasset image 2004/11/17.77113.0V
Diego Rodriguez image 2004/11/21.80013.0CR
Günther Eder image 2004/11/25.75812.6C
Buczynsk image 2004/12/02.910C
JM Llapasset image 2004/12/05.72612.9Ic
JM Llapasset image 2004/12/05.73013.0R
JM Llapasset image 2004/12/05.73413.1V
Buczynsk image 2004/12/07.81213.1C
Joaquín Sánchez image 2004/12/18.96013.3CV
J. Hannon image 2004/12/14.01013.1C
Günther Eder image 2004/12/15.88012.98C
Martin Mobberley image 2004/12/16.783C mirror
Günther Eder image 2004/12/21.75713.04C
JM Llapasset image 2005/01/10.7270Ic
JM Llapasset image 2005/01/10.7320R
JM Llapasset image 2005/01/10.7395V
JM Llapasset image 2005/01/10.74713.5CR
Günther Eder image 2005/01/17.80714.15C
H. Lindberg image 2005/01/31.75015.4V
W. Cuppens image 2005/01/22.25313.8C
JM Llapasset image 2005/02/04.21415.2CR
Gregor Duszanowicz image 2005/02/08.70815.16C
JM Llapasset image 2005/02/09.77815.2CR
Gregor Duszanowicz image 2005/02/11.71515.2C
JM Llapasset image 2005/02/23.22415.4CR
Gregor Duszanowicz 2005/03/04.13515.45C
JM Llapasset image 2005/02/23.21215.2R
JM Llapasset image 2005/02/23.21615.7V
Carsten A. Arnholm image 2005/03/30.85415.56C photometry image
JM Llapasset image 2005/04/01.13515.8R
JM Llapasset image 2005/04/01.14016.1V
Robin Leadbeater image 2005/04/09.08315.8C
Adrian Jones image 2005/04/17.02215.8CR
JM Llapasset image 2005/04/28.12516.0CRmirror
JM Llapasset image 2005/05/01.13816.0CRmirror
J Nicolas image 2005/05/19.99816.3CR
JM Llapasset image 2005/06/02.96816.3CRmirror
Stefano Moretti image 2005/06/11.116.0C
Robin Leadbeater image 2005/06/15.94016.4CR
JM Llapasset image 2005/06/17.97916.6CRmirror
J. Nicolas image 2005/06/24.88016.6CR
Richard Crisp image 2005/06/25Ccolor, more info, larget version
F. Bigey image 2005/06/30.952CR
J. Hannon image 2005/07/04.177C
Ken Levin image 2005/07/10.2817.20
J. Nicolas image 2005/07/25.87916.9CR
JM Llapasset image 2005/08/04.04717.2CRmirror
Enrico Prosperi image 2005/08/08.9317.6CR
Diego Rodriguez image 2005/08/12.90916.95CR
Enrico Prosperi 2005/08/13.99217.5C
JM Llapasset image 2005/08/13.86217.2CRmirror
J. Nicolas image 2005/08/16.83417.2CR
Wolfgang Kloehr image 2005/08/19.03117.43CR
Wolfgang Kloehr image 2005/08/29.05917.45CR
Enrico Prosperi image 2005/08/29.798CR
Enrico Prosperi image 2005/09/12.777C
Carsten A. Arnholm image 2005/09/15.31717.6CR
JM Llapasset image 2005/09/14.85817.3CRmirror
Carsten A. Arnholm image 2005/09/19.84917.66CV
Enrico Prosperi image 2005/10/01.79217.35CR
JB DeVanssay image 2005/09/22.98517.3CR
Ron Arbour image 2005/10/04.91617.4CR
JM Llapasset image 2005/10/06.80317.5CRmirror
Enrico Prosperi image 2005/10/09.74717.41CR
J. Nicolas image 2005/10/09.76317.6CR
Enrico Prosperi 2005/10/15.77417.52CR
Enrico Prosperi 2005/10/30.73117.76CR
CROSS 2005/11/13C
JM Llapasset image 2005/11/16.78218.0:CR
Enrico Prosperi 2005/11/20.71617.90CR
Wolfgang Kloehr image 2005/11/26.89018.15CR
Enrico Prosperi image 2005/12/18.70818.8CR
Joel Nicolas image 2005/12/19.74818.6CR
JM Llapasset image 2005/12/20.74618.4CRmirror
Joel Nicolas image 2005/12/21.80618.5CR
Joel Nicolas image 2006/01/31.75719.0:CR

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.
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David Bishop
Last modified: Mon Jul 12 13:58:02 EDT 2004