HD 168443
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Serpens[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 6.92[1] |
| Characteristics | |
| Spectral type | G6V[3] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: Script error: No such module "val". mas/yr[2] |
| Parallax (π) | 25.5913±0.0410 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 4.198[4] |
| Details[4] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val".[5] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | Script error: No such module "val".[1] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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HD 168443 is an ordinary yellow-hued star in the Serpens Cauda segment of the equatorial constellation of Serpens. It is known to have two substellar companions. With an apparent visual magnitude of 6.92,[1] the star lies just below the nominal lower brightness limit of visibility to the normal human eye. This system is located at a distance of 127 light years from the Sun based on parallax,[2] but is drifting closer with a radial velocity of −48.7 km/s.[1]
This stellar object is a core hydrogen fusing G-type main-sequence star with a classification of G6V, although it is likely evolved[4] with an age of around 11 billion years.[1] It is slightly lower in mass than the Sun but has a radius that is larger by 51%. The star is spinning with a leisurely projected rotational velocity of 2.2 km/s[4] and it has a very inactive chromosphere.[3][4] It is radiating 2.4[5] times the luminosity of the Sun from its photosphere at an effective temperature of 5,491 K.[4]
Planetary system
HD 168443 is known to be orbited by a super-Jupiter exoplanet, discovered in 1999, and a brown dwarf, discovered in 2001. The brown dwarf takes 30 times longer to orbit the star than the planet.[6][7][8] Both have eccentric orbits.[4] An orbital fit to Hipparcos astrometric data suggested the brown dwarf has a mass of Script error: No such module "val"..[8] A 2022 study utilizing both Hipparcos and Gaia data instead measured a true mass of Template:Jupiter mass for HD 168443 c, close to the minimum mass.[9] Test simulations of massless particles orbiting in between these two bodies show that all such objects are quickly ejected within two million years. That suggests any other planetary companions would be orbiting further out from the star.[10]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet
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See also
- HD 38529
- List of exoplanets discovered before 2000 - HD 168443 b
- List of exoplanets discovered between 2000–2009 - HD 168443 c
References
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External links
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