HD 159868
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | +7.24[3] |
| Characteristics | |
| Spectral type | G5V[4] |
| Apparent magnitude (J) | Script error: No such module "val".[5] |
| Apparent magnitude (H) | Script error: No such module "val".[5] |
| Apparent magnitude (K) | Script error: No such module "val".[5] |
| B−V Template:Engvar | Script error: No such module "val".[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[3] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[2] mas/yr Dec.: Script error: No such module "val".[2] mas/yr |
| Parallax (π) | 17.8754±0.0207 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +3.63[6] |
| Details | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[7] Template:Solar radius |
| Luminosity | 3.82[8] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[6] cgs |
| Temperature | Script error: No such module "val".[6] K |
| Metallicity [Fe/H] | Script error: No such module "val".[6] dex |
| Rotation | 7.26[9] days |
| Rotational velocity (v sin i) | 2.1[6] km/s |
| Age | Script error: No such module "val".[7] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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HD 159868 is a star in the southern constellation of Scorpius, positioned about 0.3° to the ESE of the bright star Theta Scorpii.[11] With an apparent visual magnitude of +7.24,[3] it is too faint to be visible to the naked eye but can be viewed with a small telescope. The star lies at a distance of 182 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −24 km/s.[3]
Properties
The spectrum of HD 159868 matches a G-type main-sequence star with a stellar classification of G5V. It has a relatively low surface gravity for its class, which suggests it is slightly evolved off the main sequence. The star is chromospherically inactive with a slow rotation rate, having a projected rotational velocity of 2.1 km/s.[6] It is an estimated 6.6 billion years old with 8–12% more mass than the Sun and nearly double the Sun's radius. The star is radiating 3.8 times the luminosity of the Sun from its photosphere at an effective temperature of 5,558 K.
Planetary system
In 2007, a planet of the star was announced by astronomer Simon J. O'Toole and collaborators.[12] The planet (designated HD 159868 b) is likely to be a gas giant. Preliminary orbital elements suggested the orbit is extremely eccentric at the average distance of 2 astronomical units (AU), ranging as close as 0.62 AU to as far as 3.38 AU. In 2012, a second planet of the star was announced by astronomer Robert A. Wittenmyer and associates. The orbit of the first planet was significantly revised during the investigation.[6]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet
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See also
References
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External links
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