View source for Astronomy:SN 2012fr

{{Short description|Supernova}}
{{Supernova|name=SN 2012fr|image=[[Image:TAROT discovers a bright supernova in NGC 1365.ogv|275px]]|epoch=J2000.0|type=Ia|SNRtype=|host=NGC 1365|constellation=[[Astronomy:Fornax|Fornax]]|ra=|dec=-36° 08' 25"|discovery=October 27, 2012|iauc=|mag_v=|distance=56.2 ± 2.6 Mly|progenitor=|progenitor_type=|b-v=|notes=}}
'''SN 2012fr''' was a [[Astronomy:Supernova|supernova]] in the [[Astronomy:NGC 1365|NGC 1365]] galaxy that was discovered by Alain Klotz on October 27, 2012.<ref>{{Cite web|url=http://cador.obs-hp.fr/sn_tarot/PSN_J03333599-3607377/|title=Discovery of the supernova PSN J03333599-3607377|last=Klotz|first=A.|website=cador.obs-hp.fr|access-date=2017-09-17}}</ref>

== Discovery ==
When Klotz, an astrophysicist from Institut de Recherche en Astrophysique et Planetologie in {{wipe|France}} checked the galaxy images from [[Astronomy:TAROT-South robotic observatory|TAROT la Silla observatory]], the comparison of the night image of the galaxy with a reference image taken one month before clearly revealed the presence of a new star 3"W and 52"N from the nucleus of the galaxy. 

After checking for possible objects like asteroids that might have been in the same location, four individual images that showed the new star were retrieved in the TAROT image archive. Also, the object did not appear in images taken several days before. On October 28 at 6:41 [[Physics:Coordinated Universal Time|UTC]], Emmanuel Conseil sent an email to Alain Klotz indicating he took an image of NGC 1365 using the robotic telescope [[Company:Slooh|Slooh robotic telescope]]. The picture showed the supernova candidate and was seen as the first confirmation.<ref>{{Cite web|url=http://www.astrosurf.com/buil/supernovae/2012/index.htm|title=SUPERNOVAE SPECTROSCOPIC SURVEY - 2012|website=www.astrosurf.com|access-date=2017-09-17}}</ref>

At 22:00 [[Physics:Coordinated Universal Time|UTC]], Michael Childress from Australian National University took the first spectrum, indicating that it is a type Ia supernova 11 days before the maximum of light. 

On October 31, 2012, the supernova was given the official designation 2012fr.<ref>{{Cite web|url=http://cador.obs-hp.fr/sn_tarot/PSN_J03333599-3607377/|title=Discovery of the supernova PSN J03333599-3607377|last=Klotz|first=A.|website=cador.obs-hp.fr|access-date=2017-09-17}}</ref>

== Observations ==
The TAROT telescope was taking images of the NGC 1365 and NGC 1316 every night from 29th October. The preliminary light curve indicates the supernova becoming bluer before reaching the maximum.<ref>{{Cite journal|year=2014|doi=10.1088/0004-6256/148/1/1|arxiv=1403.0398|last1=Zhang|first1=Ju-Jia|last2=Wang|first2=Xiao-Feng|last3=Bai|first3=Jin-Ming|last4=Zhang|first4=Tian-Meng|last5=Wang|first5=Bo|last6=Liu|first6=Zheng-Wei|last7=Zhao|first7=Xu-Lin|last8=Chen|first8=Jun-Cheng|title=OPTICAL AND ULTRAVIOLET OBSERVATIONS OF THE NARROW-LINED TYPE Ia SN 2012fr IN NGC 1365|journal=The Astronomical Journal|volume=148|issue=1|pages=1|bibcode=2014AJ....148....1Z|s2cid=119281027}}</ref>

[[File:The_Rise_and_Fall_of_a_Supernova.jpg|thumb|Supernova SN 2012 near nucleus of the galaxy (October 2012 - January 2013)]]

== External links ==
* [https://sne.space/sne/SN2012fr/ Light curves and spectra] {{Webarchive|url=https://web.archive.org/web/20171023011309/https://sne.space/sne/SN2012fr/ |date=2017-10-23 }} on the [https://sne.space Open Supernova Catalog]
* [http://cador.obs-hp.fr/sn_tarot/PSN_J03333599-3607377/ Discovery process by Alain Klotz]
* [https://arxiv.org/abs/1403.0398 Detailed optical and ultraviolet Observations]
* [http://www.aavso.org/apps/webobs/results/?star=SN+2012fr AAVSO]

== References ==
<references />

{{Supernovae}}
{{2012 in space}}

[[Category:Supernovae]]

{{Sourceattribution|SN 2012fr}}