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Nearby red dwarf in the constellation Boötes From Wikipedia, the free encyclopedia
Gliese 569 is a ternary star system composed of a main-sequence star orbited by a pair of brown dwarfs in the constellation of Boötes about 32 light years away.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
A | |
Right ascension | 14h 54m 29.2362s[2] |
Declination | +16° 06′ 03.798″[2] |
Apparent magnitude (V) | 10.15[3] |
B | |
Right ascension | 14h 54m 29.7686s[4] |
Declination | +16° 06′ 05.627″[4] |
Characteristics | |
BD+16 2708A | |
Evolutionary stage | main-sequence star |
Spectral type | M3 |
Apparent magnitude (g) | 9.12[2] |
Variable type | Flare star[5] |
BD+16 2708B | |
Spectral type | M8.5+M9[6] |
Apparent magnitude (g) | 15.32[4] |
Astrometry | |
A | |
Radial velocity (Rv) | −8.00±0.17 km/s |
Proper motion (μ) | RA: +279.12±0.02 mas/yr[2] Dec.: −117.91±0.02 mas/yr[2] |
Parallax (π) | 100.5243 ± 0.0210 mas[2] |
Distance | 32.446 ± 0.007 ly (9.948 ± 0.002 pc) |
Orbit[7] | |
Primary | GJ 569Ba |
Companion | GJ 569Bb |
Period (P) | 863.7±4.2 d |
Semi-major axis (a) | 0.89±0.02 AU |
Eccentricity (e) | 0.312±0.007 |
Inclination (i) | 32.4±1.3° |
Details[8] | |
Gliese 569A | |
Mass | 0.48 M☉ |
Radius | 0.43 R☉ |
Rotation | 14.7 d |
Age | <700[6] Myr |
Gliese 569B | |
Mass | 0.081+0.059[9] M☉ |
Radius | 1.69+1.28 RJup |
Temperature | 2000+2000[6] K |
Rotational velocity (v sin i) | 19+6[6] km/s |
Age | <700[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
B |
The primary star GJ 569A is orbited by the much fainter (3.7 magnitudes) secondary GJ 659B at a projected separation of 5.92 arcseconds, discovered in 1988.[11] The star GJ 569B (BD+16 2708B) itself is a close binary system of two high-mass brown dwarfs in a 2.4-year orbit,[12] and a small (0.538±0.048) magnitude difference between components.[13] The orbital plane of close binary GJ 569Ba and GJ 569Bb is expected to precess at timescales of about 100 thousand years due to the gravitational influence of GJ 569A.[6]
The primary star Gliese 569A is a flare star.[1] The nature of the brown dwarf binary Gliese 569B is highly uncertain, and it was even suspected Gliese 569Ba itself may be either a low-mass star or a binary object. But with a mass about 8-9% that of the Sun means it may possibly be a binary of two extremely low mass ultra-cool dwarf stars that are extremely dim, dim enough to look like a brown dwarf.[7] Both brown dwarfs are weakly variable, likely due to starspot activity.[12]
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