SN 2004et

{{Short description|Supernova in the constellation Cygnus}}

{{Infobox astronomical event|name=SN 2004et|event_type=Supernova|ra=20:35:25.330|dec=+60:07:17.6|epoch=J2000.0|distance={{circa}} 22 million ly|image=NGC 6946 (Kitt Peak National Observatory) (2023-115).png|caption=Locations of SN 004et and SN 2017eaw in the Fireworks Galaxy, known for having many supernovas|mag_v=20.89|discovery={{circa}} 22 million years ago

(discovered 2004)|detected_by=Spitzer Space Telescope|type=Type 2P|host=Fireworks Galaxy|constellation=Cygnus|progenitor=Red supergiant {{circa}} 13.8 solar masses}}

{{Use mdy dates|date=March 2024}}

SN 2004et is a bright type IIP{{Cite journal |last1=Misra |first1=Kuntal |last2=Pooley |first2=Dave |last3=Chandra |first3=Poonam |last4=Bhattacharya |first4=D. |last5=Ray |first5=Alak K. |last6=Sagar |first6=Ram |last7=Lewin |first7=Walter H. G. |date=October 2007 |title=Type IIP Supernova SN 2004et: A Multi-Wavelength Study in X-Ray, Optical and Radio |journal=Monthly Notices of the Royal Astronomical Society |volume=381 |issue=1 |pages=280–292 |doi=10.1111/j.1365-2966.2007.12258.x |doi-access=free |arxiv=0707.3485 |bibcode=2007MNRAS.381..280M |s2cid=14486373 |issn=0035-8711}} supernova that occurred in the spiral galaxy NGC 6946 (The Fireworks Galaxy{{Cite web |title=NGC 6946: The 'Fireworks Galaxy' – NASA |url=https://www.nasa.gov/image-article/ngc-6946-fireworks-galaxy/ |access-date=2023-10-28 |language=en-US}}), about 22 million light years away from Earth.{{Cite web |last=information@eso.org |title=Dusty supernovae (MIRI) |url=https://www.esawebb.org/images/dustysupernovae1/ |access-date=2023-10-28 |website=www.esawebb.org |language=en}} The star that made the supernova was falsely identified to be a yellow supergiant but was then identified to be a type red supergiant of 13.8 solar masses. It was discovered alongside SN 2017eaw. SN 2004et showed some rebrightening about 1,000 days after the initial supernova probably due to ejecta of circumstellar material or thermal echo.{{Cite web |title=JWST observations of dust reservoirs in type IIP supernovae 2004et and 2017eaw |url=https://academic.oup.com/mnras/article/523/4/6048/7213984 |access-date=2023-10-28}}{{Cite web |title=SN 2004et {{!}} Transient Name Server |url=https://www.wis-tns.org/object/2004et |access-date=2023-10-28 |website=www.wis-tns.org}} SN 2004et was one of the most luminous type IIP supernovae ever recorded and characterized.{{Cite journal |last1=Maguire |first1=K. |last2=Di Carlo |first2=E. |last3=Smartt |first3=S. J. |last4=Pastorello |first4=A. |last5=Tsvetkov |first5=D. Yu. |last6=Benetti |first6=S. |last7=Spiro |first7=S. |last8=Arkharov |first8=A. A. |last9=Beccari |first9=G. |last10=Botticella |first10=M. T. |last11=Cappellaro |first11=E. |last12=Cristallo |first12=S. |last13=Dolci |first13=M. |last14=Elias-Rosa |first14=N. |last15=Fiaschi |first15=M. |date=2010-05-04 |title=Optical and near-infrared coverage of SN 2004et: physical parameters and comparison with other Type IIP supernovae: Optical and NIR coverage of SN 2004et |journal=Monthly Notices of the Royal Astronomical Society |language=en |volume=404 |issue=2 |pages=981–1004 |doi=10.1111/j.1365-2966.2010.16332.x|doi-access=free |arxiv=0912.3111 }}