WISEA 1101+5400

{{Sky|11|01|25.95|+|54|00|52.8}}

{{starbox begin

|name=WISEA J110125.95+540052.8

}}

{{Starbox image

| image = 200px

| caption = Artist's impression of WISEA 1101+5400

| credit = SpaceEngine PRO, Kvasyrr

}}

{{starbox observe

|epoch=J2014.87

|equinox=J2000

|constell=Ursa Major

|ra={{RA|11|01|25.95}}

|dec={{DEC|+54|00|52.8}}

}}

{{starbox character

|type=Brown dwarf

|class=T5.5 ± 0.5

|appmag_1_passband=K

|appmag_1=17.112 ± 0.257

|appmag_2_passband=W1

|appmag_2=17.124 ± 0.118

|appmag_3_passband=W2

|appmag_3=15.371 ± 0.087

}}

{{starbox astrometry

|prop_mo_ra = -719 ± 10

|prop_mo_dec = +56 ± 23

|parallax =

|p_error =

|dist_pc=34 ± 5

}}

{{starbox catalog

|names=WISE J110125.95+540052.8, ALLWISE J110125.95+540052.8, WISE J110125.99+540052.8}}

{{Starbox reference

|Simbad=WISEA+J110125.95%2B540052.8

}}

{{starbox end}}

WISEA 1101+5400 (full name WISEA J110125.95+540052.8) is a T-type brown dwarf (specifically T5.5) approximately 100 light-years away in the constellation Ursa Major.{{cite web|last1=Marc Kuchner|title=Our First Discoveries - Backyard Worlds: Planet Nine|date=10 March 2017|url=https://blog.backyardworlds.org/2017/03/10/our-first-discoveries/|accessdate=31 March 2017}}{{Cite journal |last1=Kuchner |first1=Marc J. |display-authors=etal |year=2017 |title=The First Brown Dwarf Discovered by the Backyard Worlds: Planet 9 Citizen Science Project |journal=The Astrophysical Journal |volume=841 |issue=2 |pages=L19 |arxiv=1705.02919 |bibcode= 2017ApJ...841L..19K|doi=10.3847/2041-8213/aa7200|s2cid=119087928 |doi-access=free }} It was discovered in March 2017 by members of the citizen science project Backyard Worlds. Initial photometric analysis suggested it was a T5.5 dwarf, which was later confirmed by a spectrum of the object obtained with the NASA Infrared Telescope Facility.{{cite tweet|number=847540081112043521|user=backyardworlds|title=Here's the spectrum of our T5.5 dwarf...|accessdate=31 March 2017|date=30 March 2017}} It is the first confirmed brown dwarf found by the project.

The brown dwarf was identified by several volunteers, including the therapist Rosa Castro, Bob Fletcher, Khasan Mokaev and Tamara Stajic.{{Cite web|url=https://svs.gsfc.nasa.gov/12660|title=GMS: New Brown Dwarf Found by NASA-funded Citizen Science Project|website=svs.gsfc.nasa.gov|date=17 July 2017|access-date=2020-01-28}} WISEA 1101+5400 was discovered six days after the launch of the project and the discovery was the fastest publication for any Zooniverse project at the time of the publication.{{Cite web|url=https://blog.backyardworlds.org/2017/06/08/our-first-paper-the-discovery-of-brown-dwarf-wisea-11015400/|title=Our First Paper: the Discovery of Brown Dwarf WISEA 1101+5400|last=marckuchner2014|first=Author|date=2017-06-08|website=Backyard Worlds: Planet 9|language=en|access-date=2020-01-28}}

The discovery of this brown dwarf allowed the backyard worlds collaboration to estimate the amount of new brown dwarfs the project could discover. This was allowed due to the fact that the brown dwarf is one magnitude fainter than any brown dwarf previously discovered with proper motion surveys. The team estimated that the project would discover {{val|37|39|21}} new L-dwarfs, {{val|77|41|31}} T-dwarfs and {{val|6|7|4}} Y-dwarfs. As of July 2019 the project did meet this estimate with spectroscopically confirmed T- and L-dwarfs (70 T-dwarfs and 61 L-dwarfs), but exceeded this estimate by brown dwarf candidates (1305).{{Cite web|url=https://blog.backyardworlds.org/2019/07/15/one-hundred-thirty-one-brown-dwarfs/|title=One Hundred Thirty-One Brown Dwarfs|last=marckuchner2014|first=Author|date=2019-07-15|website=Backyard Worlds: Planet 9|language=en|access-date=2020-01-28}}