T Boötis

{{short description|Nova seen in 1860}}{{distinguish|Tau Boötis}} {{Starbox begin}} {{Starbox image | image= {{Location mark |image=TBooLocation.png|alt=|width=280 }} |caption=Location of T Boötes (circled in red) }} {{Starbox observe | |epoch=[[J2000.0]] ([[International Celestial Reference System|ICRS]]) | |ra={{RA|14|14|07.00}}<ref name=VSX>{{cite web|title=VSX: Detail for T Boo|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=4306|website=The International Variable Star Index|publisher=AAVSO|access-date=16 May 2015|archive-url=https://web.archive.org/web/20170428053623/http://www.aavso.org/vsx/index.php?view=detail.top&oid=4306|url-status=live|archive-date=28 April 2017}}</ref> |dec={{DEC|+19|04|00.0}} |appmag_v=9.7-<20.4<ref name=VSX /> | |constell=[[Boötes]]}} {{Starbox character | class= | b-v= | u-b= | variable= N (Nova)<ref name=VSX /> }} {{Starbox catalog | names= AAVSO 1409+19, BD+19 2768<ref name=VSX /> }} {{Starbox reference | Simbad=T+Boo }} {{Starbox end}}

'''T Boötis''' is believed to have been a [[nova]]. It was observed by only one person, [[Joseph Baxendell]], on 9, 11 and 22 April 1860, but has not been seen since.<ref name=Baxendell>{{cite journal|last1=Baxendell|first1=Joseph|title=On the Three New Variable Stars, T Bootis, T. Serpentis, and S Delphini|journal=Monthly Notices of the Royal Astronomical Society|year=1861|volume=21|issue=3|page=68|publisher=Smithsonian Astrophysical Observatory|doi=10.1093/mnras/21.3.68|bibcode=1861MNRAS..21...68B|doi-access=free}}</ref> It is located less than half a degree from [[Arcturus]] in the [[constellation]] [[Boötes]] and was at magnitude 9.75 when first seen, and magnitude 12.8 when last seen.<ref name=Baxendell /> Other astronomers, including [[Friedrich August Theodor Winnecke|Friedrich Winnecke]], [[Edward Charles Pickering]], [[Ernst Hartwig]] and [[Ernst Zinner]] looked for a star in this location without success.<ref name=Burnham>{{cite book|last1=Burnham|first1=Robert|title=Burnham's Celestial Handbook Volume 1|date=1978|publisher=Dover|isbn=978-0-486-31902-5|page=311|url=https://books.google.com/books?id=z3_CAgAAQBAJ&pg=PA311}}</ref>

Despite being usually referred to as a nova, it had characteristics that set it apart from other novae: an amplitude of at least 7 magnitudes, an unusually rapid decline in brightness and a location unusually far from the [[Galactic plane]].<ref name=Burnham /> [[Joseph Ashbrook]] suggested in 1953 that it may be a recurrent nova which has been observed only once.<ref name=Ashbrook>{{cite journal|last1=Ashbrook|first1=Joseph|title=Notes on Four Novae|url=http://adsabs.harvard.edu/full/1953AJ.....58..175F|journal=The Astronomical Journal|year=1953 |volume=58 |page=175 |publisher=Smithsonian Astrophysical Observatory|doi=10.1086/106846 |bibcode=1953AJ.....58..175F|access-date=16 May 2015|archive-url=https://archive.today/20240527084226/https://www.webcitation.org/6YYkHUYgs?url=http://adsabs.harvard.edu/full/1953AJ.....58..175F|url-status=live|archive-date=27 May 2024}}</ref>

==References== {{Reflist}}

{{DEFAULTSORT:T Bootis}} [[Category:Novae]] [[Category:Boötes]] [[Category:1860 in science]] [[Category:Objects with variable star designations|Bootis, T]]