Coordinates: Sky map 11h 01m 25.95s, +54° 00′ 52.8″

WISEA 1101+5400

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WISEA J110125.95+540052.8
WISEA 1101+5400.jpg
Artist's impression of WISEA 1101+5400
Credit: SpaceEngine PRO, Kvasyrr
Observation data
Epoch J2014.87      Equinox J2000
Constellation Ursa Major
Right ascension 11h 01m 25.95s
Declination +54° 00′ 52.8″
Evolutionary stage Brown dwarf
Spectral type T5.5 ± 0.5[1]
Apparent magnitude (K) 17.112 ± 0.257[1]
Apparent magnitude (W1) 17.124 ± 0.118[1]
Apparent magnitude (W2) 15.371 ± 0.087[1]
Proper motion (μ) RA: -719 ± 10[1] mas/yr
Dec.: +56 ± 23[1] mas/yr
Distance34 ± 5[1] pc
Other designations
WISE J110125.95+540052.8, ALLWISE J110125.95+540052.8, WISE J110125.99+540052.8
Database references

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.[2][1] 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.[3] 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.[4][1] 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.[5]

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 37+39
new L-dwarfs, 77+41
T-dwarfs and 6+7
Y-dwarfs.[1] 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).[6]

External links[edit]


  1. ^ a b c d e f g h i j Kuchner, Marc J.; et al. (2017). "The First Brown Dwarf Discovered by the Backyard Worlds: Planet 9 Citizen Science Project". The Astrophysical Journal. 841 (2): L19. arXiv:1705.02919. Bibcode:2017ApJ...841L..19K. doi:10.3847/2041-8213/aa7200. S2CID 119087928.
  2. ^ Marc Kuchner (10 March 2017). "Our First Discoveries - Backyard Worlds: Planet Nine". Retrieved 31 March 2017.
  3. ^ @backyardworlds (30 March 2017). "Here's the spectrum of our T5.5 dwarf..." (Tweet). Retrieved 31 March 2017 – via Twitter.
  4. ^ "GMS: New Brown Dwarf Found by NASA-funded Citizen Science Project". 17 July 2017. Retrieved 2020-01-28.
  5. ^ marckuchner2014, Author (2017-06-08). "Our First Paper: the Discovery of Brown Dwarf WISEA 1101+5400". Backyard Worlds: Planet 9. Retrieved 2020-01-28. {{cite web}}: |first= has generic name (help)
  6. ^ marckuchner2014, Author (2019-07-15). "One Hundred Thirty-One Brown Dwarfs". Backyard Worlds: Planet 9. Retrieved 2020-01-28. {{cite web}}: |first= has generic name (help)