Gliese 570
Quaternary star system in the constellation Libra / From Wikipedia, the free encyclopedia
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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.
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
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[1] |
Declination | −21° 24′ 55.7131″[1] |
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[2] km/s |
Proper motion (μ) | RA: 1031.472 mas/yr[2] Dec.: -1723.619 mas/yr[2] |
Parallax (π) | 169.8843 ± 0.0653 mas[2] |
Distance | 19.199 ± 0.007 ly (5.886 ± 0.002 pc) |
Absolute magnitude (MV) | 6.89[3] |
BC | |
Radial velocity (Rv) | +25.9[4] km/s |
Proper motion (μ) | RA: 961.78[1] mas/yr Dec.: -1677.83[1] mas/yr |
Parallax (π) | 168.77 ± 21.54 mas[1] |
Distance | approx. 19 ly (approx. 5.9 pc) |
Absolute magnitude (MV) | 9.19[3] / 11.05 |
D | |
Proper motion (μ) | RA: 1038.08[5] mas/yr Dec.: -1677.59[5] mas/yr |
Parallax (π) | 169.30 ± 1.70 mas[6] |
Distance | 19.3 ± 0.2 ly (5.91 ± 0.06 pc) |
Absolute magnitude (MV) | 11.05[citation needed] |
Details | |
Mass | 0.802 ± 0.040[7] / 0.55 / 0.35 / 0.05 M☉ |
Radius | 0.739 ± 0.019[7] / 0.65 R☉ |
Luminosity (bolometric) | 0.22[note 1] / 0.04 / ? / 3•10−6[8] L☉ |
Luminosity (visual, LV) | 0.16 / 0.02 / 0.003 / ? L☉ |
Temperature | 4597 ± 101[7] / 2700 K |
Metallicity | [7] |
Rotation | 48.3 days |
Rotational velocity (v sin i) | 1.50[7] km/s |
Other designations | |
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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