TVLM 513-46546
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 15h 01m 08.18646s |
| Declination | +22° 50′ 02.1379″ |
| Apparent magnitude (V) | 15.09 |
| Characteristics | |
| Evolutionary stage | Brown dwarf |
| Spectral type | M9 |
| Astrometry | |
| Proper motion (μ) | RA: −43.120±0.111 mas/yr Dec.: −65.138±0.140 mas/yr |
| Parallax (π) | 93.1655±0.1355 mas |
| Distance | 35.01 ± 0.05 ly (10.73 ± 0.02 pc) |
| Details | |
| Mass | 0.06–0.08 M☉ |
| Radius | 0.097 – 0.109 R☉ |
| Luminosity | 0.00026 L☉ |
| Temperature | 2242±55 K |
| Rotation | 1.96 h |
| Rotational velocity (v sin i) | 60 km/s |
| Age | >400 Myr |
| Other designations | |
| 2MASS J15010818+2250020, 2MASSI J1501081+225001, 2MUCD 20596 | |
| Database references | |
| SIMBAD | data |
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. 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.