SN 2020fqv

{{Short description|2020 supernova event in the NGC 4568 spiral galaxy collision}}

{{Infobox astronomical event

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| image = SN 2020fqv in NGC 4568.tif

| image_size = 320px

| caption = Supernova SN 2020fqv in the Butterfly Galaxy NGC 4568

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| event_type = SN IIb

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| start_time = March 31, 2020

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| ra = {{RA|12|36|33.260}}{{cite web | title=SN 2020fqv | website=Transient Name Server | publisher=IAU supernova working group | url=https://www.wis-tns.org/object/2020fqv | access-date=2022-02-28 }}

| dec = {{DEC|+11|13|53.87}}

| epoch = J2000

| gal = NGC 4568

| distance =

| redshift = 0.007522

| source =

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| host =

| progenitor =

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SN 2020fqv was a type II supernova which occurred in March 2020 in the spiral galaxy NGC 4568, approximately 60 million light years from Earth. The explosion was detected by both the Zwicky Transient Facility and the Transiting Exoplanet Survey Satellite. Observations were obtained by the Hubble Space Telescope both years before and just 26 hours after it exploded, as well as many other instruments, providing the first holistic view of such an event.{{Cite web|date=2021-10-28|title=The last days of a massive star before it went supernova|url=https://www.syfy.com/supernova-immediate-past-revealed-by-hubble-and-tess|access-date=2021-11-01|website=SYFY Official Site|language=en-US}}{{Cite web|last=Gough|first=Evan|date=2021-10-29|title=Quick Action Let Hubble Watch the Earliest Stages of an Unfolding Supernova Detonation|url=https://www.universetoday.com/153114/quick-action-let-hubble-watch-the-earliest-stages-of-an-unfolding-supernova-detonation/|access-date=2021-11-01|website=Universe Today|language=en-US}}{{Cite web|date=2021-11-25|title=Astronomers Observe 'Rosetta Stone of Supernovae' {{!}} Sci-News.com|url=http://www.sci-news.com/astronomy/type-ii-core-collapse-supernova-sn-2020fqv-10201.html|access-date=2021-10-30|website=Breaking Science News {{!}} Sci-News.com|language=en-US}}{{Cite web|last=Howell|first=Elizabeth|date=2021-10-25|title=Hubble telescope spots doomed star that is the 'Rosetta stone' of supernovas|url=https://www.space.com/doomed-star-rosetta-stone-of-supernovas-hubble-photo|access-date=2021-10-30|website=Space.com|language=en}}{{Cite journal|last1=Tinyanont|first1=Samaporn|last2=Ridden-Harper|first2=R|last3=Foley|first3=R J|last4=Morozova|first4=V|last5=Kilpatrick|first5=C D|last6=Dimitriadis|first6=G|last7=DeMarchi|first7=L|last8=Gagliano|first8=A|last9=Jacobson-Galán|first9=W V|last10=Messick|first10=A|last11=Pierel|first11=J D R|date=2021-10-26|title=Progenitor and close-in Circumstellar Medium of Type II Supernova 2020fqv from high-cadence photometry and ultra-rapid UV spectroscopy|journal=Monthly Notices of the Royal Astronomical Society|volume=512 |issue=stab2887|pages=2777–2797 |doi=10.1093/mnras/stab2887|doi-access=free |issn=0035-8711|arxiv=2110.10742}}

The progenitor star is modelled to be a red supergiant with a radius of {{solar radius|{{val|800|100|}}|;ink=y}} and a mass of {{solar mass|{{val|15|3}}|link=y}}, fairly typical of type II supernova progenitors.