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Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 15h 01m 08.187s
Declination +22° 50' 02.04"'
Spectral type M8.5V
Proper motion (μ) RA: -55 mas/yr
Dec.: -59 mas/yr
Parallax (π) 92.92 ± 0.23[1] mas
Distance 35.10 ± 0.09 ly
(10.76 ± 0.03 pc)
Mass 0.09 M
Radius 0.11 R
Luminosity 0.00042 L
Temperature 2,500 K
Age >1 billion years
Other designations
2MASS J15010818+2250020, 2MASSI J1501081+225001, 2MUCD 20596.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

TVLM513-46546 is an ultracool brown dwarf in the constellation Boötes, exhibiting a flare star activity and all the same varying semi-regularly due to dissimilarly bright hemispheres and a rotation period of about two days. The star has a mass as low as 90 times the mass of Jupiter (or 9 percent of Sun's mass) and an estimated radius of 11 percent that of Sun (nearly a Jupiter-sized star). The star also shows hints of an unseen companion with undetermined mass. Future monitoring will be able to confirm or rule out low-mass stellar or even planetary mass companions (down to 2-10 Jupiter masses), with orbital periods spanning between 1 and 15 days.[2] Assuming a stellar luminosity of 0.042 percent that of Sun, the habitable zone where an Earth-like planet may retain liquid water at comfortable temperatures would be located within 0.02 Astronomical Units (roughly 10 times the distance of the Moon from Earth).

TVLM513-46546 distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Forbrich & Berger (2005) 94.4±0.6 10.59±0.07 34.55±0.22 326.9±2.1 [2]
Forbrich et al. (2013) 92.92±0.23 10.762±0.027 35.1±0.09 332.1±0.8 [1]

Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.


  1. ^ a b Jan Forbrich; Edo Berger; Mark J. Reid (2013). "An Astrometric Search for a Sub-stellar Companion of the M8.5 Dwarf TVLM513–46546 Using Very Long Baseline Interferometry.". arXiv:1307.4117v1. 
  2. ^ a b Forbrich; Berger, Edo (2005). "The First VLBI Detection of an Ultracool Dwarf: Implications for the Detectability of Sub-stellar Companions". The Astrophysical Journal Letters 706 (2): 205–209. arXiv:0910.1349. Bibcode:2009ApJ...706L.205F. doi:10.1088/0004-637X/706/2/L205. 

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