HD 4203
Template:Short description Template:Use dmy dates
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 8.70[1] |
| Characteristics | |
| Evolutionary stage | subgiant[3][2] |
| Spectral type | G5V[4] |
| 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: +122.100[2] mas/yr Dec.: −124.204[2] mas/yr |
| Parallax (π) | 12.3036±0.0195 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 4.28[1] |
| Details[5] | |
| 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". 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".[1] dex |
| Rotational velocity (v sin i) | 5.6[6] km/s |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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HD 4203 is a single star in the equatorial constellation of Pisces, near the northern constellation border with Andromeda. It has a yellow hue and is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.70.[1] The distance to this object is 265 light years based on parallax,[2] but it is drifting closer to the Sun with a radial velocity of −14 km/s.[1]
This object is an ordinary G-type subgiant star with a stellar classification of G5V. It is photometrically-stable star with an inactive chromosphere, and has a much higher than normal metallicity.[4] The star is roughly 6.3 billion years old and is spinning with a projected rotational velocity of 5.6 km/s.[6] It has 12% more mass than the Sun and a 35% greater radius. HD 4203 is radiating 1.68 times the luminosity of the Sun from its photosphere at an effective temperature of 5,666 K.[5]
Planetary system
Radial velocity observations of this star during 2000–2001 found a variability that suggesting an orbited sub-stellar companion, designated component 'b'.[4] Additional observations led to a refined orbital period of 432 days with a relatively high eccentricity of 0.52 for a gas giant companion.[8] The presence of a second companion was deduced from residuals in the data, then confirmed in 2014. However, the orbital elements for this companion, component 'c', are poorly constrained.[9]
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See also
Notes
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- ↑ a b c d e f g h Template:Cite XHIP
- ↑ a b c d e f g Template:Cite Gaia DR3
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- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Template:Cite simbad
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