WISEA 1101+5400

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

WISEA J110125.95+540052.8
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
Apparent magnitude (K) ~17.4
Apparent magnitude (W1) 17.12
Apparent magnitude (W2) 15.37
Proper motion (μ) RA: -1034 ± 80 mas/yr
Dec.: +61 ± 30 mas/yr
Parallax (π)32 ± 2 mas
Distance102 ± 6 ly
(31 ± 2 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.[1][2] 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 star.[3] It is the first confirmed brown dwarf found by the project.


  1. ^ Marc Kuchner. "Our First Discoveries - Backyard Worlds: Planet Nine". Retrieved 31 March 2017.
  2. ^ 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.
  3. ^ @backyardworlds (30 March 2017). "Here's the spectrum of our T5.5 dwarf..." (Tweet). Retrieved 31 March 2017 – via Twitter.