Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 27m 49.48500s[1] |
Declination | –29° 49′ 00.7008″[1] |
Apparent magnitude (V) | +5.90[2] |
Characteristics | |
Spectral type | F7V[3] |
B−V color index | 0.517±0.004[2] |
Variable type | “None” |
Astrometry | |
Radial velocity (Rv) | −17.271±0.0004[4] km/s |
Proper motion (μ) | RA: −0.341[1] mas/yr Dec.: 16.103[1] mas/yr |
Parallax (π) | 27.1461 ± 0.1469 mas[1] |
Distance | 120.1 ± 0.7 ly (36.8 ± 0.2 pc) |
Absolute magnitude (MV) | +3.08[2] |
Details[5] | |
Mass | 1.4 M☉ |
Radius | 1.84 R☉ |
Luminosity | 4.63[6] L☉ |
Surface gravity (log g) | 4.06 cgs |
Temperature | 6,300±50[6] K |
Metallicity [Fe/H] | 0.15 dex |
Rotation | 8.3 d[7] |
Rotational velocity (v sin i) | 3.83 km/s |
Age | 4.95[8] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
HD 169830 is a star in the southern constellation of Sagittarius. It has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.90.[2] The star is located at a distance of 120 light years from the Sun based on parallax. It is drifting closer with a radial velocity of −17.3 km/s,[4] and is predicted to come as close as 20.7 ly (6.4 pc) in 2.08 million years.[10] HD 169830 is known to be orbited by two large Jupiter-like exoplanets.
This is an F-type main-sequence star[6] with a stellar classification of F7V.[3] It is 3.83[8] billion years old and chromospherically inactive[8] with a slow rotation rate,[8] having a projected rotational velocity of 3.83 km/s.[5] This star is 40% more massive and 84% larger than the Sun. Combining the mass and radius makes the surface gravity only 41% that of the Sun. It is radiating 4.6[6] times the luminosity of the Sun from its photosphere at an effective temperature of 6,300 K.[6]
A candidate stellar companion, designated component B, lies at an angular separation of 11″ along a position angle of 265°.[11]
On April 15, 2000, the Geneva Extrasolar Planet Search Team announced the discovery of a minimum mass 3 MJ planet in a 226-day orbit.[12][6] Three years later on June 30, 2003, the same team, using the same method, discovered a minimum mass 3.5 MJ second planet orbiting the star.[7] In 2022, the inclination and true mass of HD 169830 c were measured via astrometry.[13]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥2.956+0.070 −0.069 MJ |
0.8130+0.0083 −0.0084 |
225.789+0.074 −0.081 |
0.306+0.012 −0.013 |
— | — |
c | 7.669+1.937 −2.755 MJ |
3.075+0.132 −0.146 |
1818.8+5.7 −6.4 |
0.246+0.022 −0.018 |
24.469+12.739 −7.205° |
— |