TVLM 513-46546

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TVLM 513-46546
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 15h 01m 08.187s
Declination +22° 50' 02.04"'
Spectral type M9
Proper motion (μ) RA: -55 mas/yr
Dec.: -59 mas/yr
Parallax (π)92.92 ± 0.23[1] mas
Distance35.10 ± 0.09 ly
(10.76 ± 0.03 pc)
Mass0.09 M
Radius0.11 R
Luminosity0.00042 L
Temperature2,500 K
Age>1 billion years
Other designations
2MASS J15010818+2250020, 2MASSI J1501081+225001, 2MUCD 20596.
Database references

TVLM 513-46546 is an M9 ultracool dwarf at the red dwarf/ brown dwarf mass boundary in the constellation Boötes. It exhibits flare star activity, which is most pronounced at radio wavelengths. The star has a mass approximately 80 times the mass of Jupiter (or 8 percent of the Sun's mass). The radio emission is broadband and highly circularly polarized, similar to planetary auroral radio emissions.[2] The radio emission is periodic, with bursts emitted every 7054 s, with nearly one hundredth of a second precision. Subtle variations in the radio pulses could suggest that the ultracool dwarf rotates faster at the equator than the poles (differential rotation) in a manner similar to the Sun.[3]


  1. ^ 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". The Astrophysical Journal. 777: 70. arXiv:1307.4117v1. Bibcode:2013ApJ...777...70F. doi:10.1088/0004-637X/777/1/70.
  2. ^ Hallinan, G. (2006). "Rotational Modulation of the Radio Emission from the M9 Dwarf TVLM 513-46546: Broadband Coherent Emission at the Substellar Boundary?". The Astrophysical Journal. 653 (1): 690–699. arXiv:astro-ph/0608556. Bibcode:2006ApJ...653..690H. doi:10.1086/508678.
  3. ^ Wolszczan, A.; Route, M. (2014). "Timing Analysis of the Periodic Radio and Optical Brightness Variations of the Ultracool Dwarf, TVLM 513-46546". The Astrophysical Journal. 788 (1): 23. arXiv:1404.4682. Bibcode:2014ApJ...788...23W. doi:10.1088/0004-637X/788/1/23.