Gliese 570
The quaternary star system Gliese 570. The T-type methane brown dwarf Gliese 570D is indicated with an arrow. Credit: 2MASS | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Libra |
| Right ascension | 14h 57m 28.00144s |
| Declination | −21° 24′ 55.7131″ |
| Apparent magnitude (V) | 5.75 / 8.07 / 10.5 |
| Characteristics | |
| Spectral type | K4V / M1V / M3V / T7V |
| U−B color index | 1.06 /1.22 |
| B−V color index | 1.11 / 1.51 |
| Variable type | None |
| Astrometry | |
| A | |
| Radial velocity (Rv) | +26.75±0.12 km/s |
| Proper motion (μ) | RA: +1031.472 mas/yr Dec.: −1723.619 mas/yr |
| Parallax (π) | 169.8843±0.0653 mas |
| Distance | 19.199 ± 0.007 ly (5.886 ± 0.002 pc) |
| Absolute magnitude (MV) | 6.89 |
| BC | |
| Radial velocity (Rv) | +25.9 km/s |
| Proper motion (μ) | RA: +961.78 mas/yr Dec.: −1677.83 mas/yr |
| Parallax (π) | 169.1±0.9 mas |
| Distance | 19.3 ± 0.1 ly (5.91 ± 0.03 pc) |
| Absolute magnitude (MV) | 9.19 / 11.05 |
| D | |
| Proper motion (μ) | RA: +1038.08 mas/yr Dec.: −1677.59 mas/yr |
| Parallax (π) | 169.30±1.70 mas |
| Distance | 19.3 ± 0.2 ly (5.91 ± 0.06 pc) |
| Details | |
| A | |
| Mass | 0.802 ± 0.040 M☉ |
| Radius | 0.715±0.009 R☉ |
| Luminosity (bolometric) | 0.19±0.01 L☉ |
| Temperature | 4505±76 K |
| Metallicity | |
| Rotational velocity (v sin i) | 1.50 km/s |
| B | |
| Mass | 0.562±0.006 M☉ |
| C | |
| Mass | 0.377±0.003 M☉ |
| D | |
| Mass | 34.6+7.5 −6.5 MJup |
| Radius | 0.89+0.05 −0.04 RJup |
| Luminosity | 10−5.54±0.03 L☉ |
| Surface gravity (log g) | 5.04±0.13 cgs |
| Temperature | 786±20 K |
| Other designations | |
| 33 G. Librae, GJ 570, HD 131976, ADS 9446, WDS J14575-2125 | |
| A: HR 5568, LAL 27173, HD 131977, BD-20°4125, LHS 387, LTT 5949, GCTP 3375.00, SAO 183040, FK5 1391, LFT 1161, LPM 551, Vys 726, HIP 73184 | |
| BC: HD 131976, HIP 73182, LHS 386, LTT 5948, BD-20°4123, SAO 183039, LFT 1160, LPM 550 | |
| D: 2MASS J14571496-2121477 | |
| Database references | |
| SIMBAD | A |
| BC | |
| D | |
| Exoplanet Archive | data |
| ARICNS | data |
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Gliese 570 (or 33 G. Librae) is a quaternary star system approximately 19 light-years away. The primary star is an orange dwarf star (much dimmer and smaller than the Sun). The other secondary stars are themselves a binary system, two red dwarfs that orbit the primary star. A brown dwarf has been confirmed to be orbiting in the system. In 1998, an extrasolar planet was thought to orbit the primary star, but it was discounted in 2000.