View source for Astronomy:SN 1990U

{{Short description|Supernova in the galaxy NGC 7479}}
{{Supernova 
| name = SN 1990U
| image = 
| caption = 
| epoch = [[Astronomy:J2000.0|J2000.0]] 
| type = SN Ic<ref name="aj108_1_195"/>
| SNRtype = 
| host = [[Astronomy:NGC 7479|NGC 7479]]
| constellation = [[Astronomy:Pegasus (constellation)|Pegasus]]
| ra = {{RA|23|04|54.96}}<ref name=SAISC/>
| dec = {{DEC|+12|18|20.1}}<ref name=SAISC/>
| gal = 086.2501 -42.8526 
| discovery = July 27, 1990<ref name="aj108_1_195"/>
| iauc = 
| redshift = 0.00794<ref name=ajl731_1_L4/>
| mag_v = {{val|16|0.5}}<ref name="aj108_1_195"/>
| distance = 105,000,000 ly
| notes =   
}}

'''SN 1990U''' was a type Ic supernova event in the nucleus of the  galaxy [[Astronomy:NGC 7479|NGC 7479]]. It was discovered July 27, 1990 by the Berkeley Automated Supernova Search after reaching magnitude {{val|16|0.5}}.<ref name="aj108_1_195"/> Initially this was classified as a Type Ib supernova, but the weakness of the neutral helium absorption lines led to a reclassification.<ref name="aj121_3_1648"/>

==References==
{{reflist|refs=

<ref name="aj108_1_195">{{citation
 | last1=Gomez | first1=G.
 | last2=Lopez | first2=R. 
 | title=Spectral evolution of the He-Poor supernovae 1990U in NGC 7479 and 1991A in IC 2973 
 | journal=The Astronomical Journal
 | volume=108 | issue=1 | pages=195–201 | date=July 1994
 | doi=10.1086/117058 
 | bibcode=1994AJ....108..195G 
}}</ref>

<ref name="aj121_3_1648">{{citation
 | last1=Matheson | first1=Thomas
 | last2=Filippenko | first2=Alexei V.
 | last3=Li | first3=Weidong
 | last4=Leonard | first4=Douglas C.
 | last5=Shields | first5=Joseph C.
 | title=Optical Spectroscopy of Type IB/C Supernovae 
 | journal=The Astronomical Journal
 | volume=121 | issue=3 | pages=1648–1675 | date=March 2001
 | doi=10.1086/319390
 | bibcode=2001AJ....121.1648M
|arxiv = astro-ph/0101119 | s2cid=119438971
 }}</ref>

<ref name=SAISC>{{citation
 | last1=Tsvetkov | first1=D. Yu.
 | last2=Pavlyuk | first2=N. N.
 | last3=Bartunov | first3=O. S.
 | last4=Pskovskii | first4=Yu. P.
 | title=Sternberg Astronomical Institute Supernova Catalogue
 | url=http://www.sai.msu.su/sn/sncat/
 | publisher=[[Organization:Sternberg Astronomical Institute|Sternberg Astronomical Institute]], Moscow University
 | accessdate=2015-08-26
}}</ref>

<ref name=ajl731_1_L4>{{citation
 | last1=Modjaz | first1=M.
 | last2=Kewley | first2=L.
 | last3=Bloom | first3=J. S.
 | last4=Filippenko | first4=A. V.
 | last5=Perley | first5=D.
 | last6=Silverman | first6=J. M. 
 | title=Progenitor Diagnostics for Stripped Core-collapse Supernovae: Measured Metallicities at Explosion Sites 
 | journal=The Astrophysical Journal Letters
 | volume=731 | issue=1 | id=L4 | pages=6
 | date=April 2011
 | doi=10.1088/2041-8205/731/1/L4 
 | bibcode=2011ApJ...731L...4M 
|arxiv = 1007.0661 | s2cid=56147580
 }}</ref>

}}

==External links==
* [https://sne.space/sne/SN1990U/ Spectra] {{Webarchive|url=https://web.archive.org/web/20171023011611/https://sne.space/sne/SN1990U/ |date=2017-10-23 }} on the [https://sne.space Open Supernova Catalog]
* [http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=SN+1990U&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad]
* [http://aladin.u-strasbg.fr/AladinPreview?-c=23+04+54.96%2B12+18+20.1&ident=SN+1990U&submit=Aladin+previewer Image SN 1990U]

[[Category:Pegasus (constellation)]]
[[Category:Supernovae]]


{{Sourceattribution|SN 1990U}}