| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 44m 41.2003s [1] |
| Declination | +20° 26′ 56.1380″ [1] |
| Apparent magnitude (V) | 8.70 [2] |
| Characteristics | |
| Spectral type | G5V [3] |
| B−V color index | +0.771±0.021 [2] |
| Astrometry | |
| Radial velocity (Rv) | −14.20±0.09 [2] km/s |
| Proper motion (μ) |
RA: +122.070±0.102
[1]
mas/
yr Dec.: −124.192±0.062 [1] mas/ yr |
| Parallax (π) | 12.2595 ± 0.0538 mas [1] |
| Distance | 266 ± 1
ly (81.6 ± 0.4 pc) |
| Absolute magnitude (MV) | 4.28 [2] |
| Details [4] | |
| Mass | 1.12±0.03 M☉ |
| Radius | 1.35±0.03 R☉ |
| Luminosity | 1.68±0.01 L☉ |
| Surface gravity (log g) | 4.22±0.03 cgs |
| Temperature | 5,666±43 K |
| Metallicity [Fe/H] | 0.34±0.01 [2] dex |
| Rotational velocity (v sin i) | 5.6 [5] km/s |
| Age | 6.3±1.0 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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. [2] The distance to this object is 266 light years based on parallax, [1] but it is drifting closer to the Sun with a radial velocity of −14 km/s. [2]
This object is an ordinary G-type main-sequence star with a stellar classification of G5V. It is photometrically-stable star with an inactive chromosphere, and has a much higher than normal metallicity. [3] The star is roughly 6.3 billion years old and is spinning with a projected rotational velocity of 5.6 km/s. [5] 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. [4]
Radial velocity observations of this star during 2000–2001 found a variability that suggesting an orbited sub-stellar companion, designated component 'b'. [3] Additional observations led to a refined orbital period of 432 days with a relatively high eccentricity of 0.52 for a gas giant companion. [7] 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. [8]
| Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | > 1.164±0.067 MJ | 2.07±0.18 | 431.88±0.85 | 0.519±0.027 | — | — |
| c | > 2.17±0.52 MJ | — | 6,700±4,500 | 0.24±0.13 | — | — |
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c Vogt, Steven S.; et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal. 568 (1): 352–362. arXiv: astro-ph/0110378. Bibcode: 2002ApJ...568..352V. doi: 10.1086/338768. S2CID 2272917.
- ^ a b Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv: 1411.4302. Bibcode: 2015A&A...575A..18B. doi: 10.1051/0004-6361/201424951. S2CID 54555839.
- ^ a b Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv: 1611.02897. Bibcode: 2017AJ....153...21L. doi: 10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- ^ "HD 4203". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 November 2019.
- ^ a b Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv: astro-ph/0607493. Bibcode: 2006ApJ...646..505B. doi: 10.1086/504701. S2CID 119067572.
- ^ Kane, Stephen R.; et al. (April 2014). "Limits on Stellar Companions to Exoplanet Host Stars with Eccentric Planets". The Astrophysical Journal. 785 (2): 10. arXiv: 1401.1544. Bibcode: 2014ApJ...785...93K. doi: 10.1088/0004-637X/785/2/93. S2CID 2053475. 93.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 44m 41.2003s [1] |
| Declination | +20° 26′ 56.1380″ [1] |
| Apparent magnitude (V) | 8.70 [2] |
| Characteristics | |
| Spectral type | G5V [3] |
| B−V color index | +0.771±0.021 [2] |
| Astrometry | |
| Radial velocity (Rv) | −14.20±0.09 [2] km/s |
| Proper motion (μ) |
RA: +122.070±0.102
[1]
mas/
yr Dec.: −124.192±0.062 [1] mas/ yr |
| Parallax (π) | 12.2595 ± 0.0538 mas [1] |
| Distance | 266 ± 1
ly (81.6 ± 0.4 pc) |
| Absolute magnitude (MV) | 4.28 [2] |
| Details [4] | |
| Mass | 1.12±0.03 M☉ |
| Radius | 1.35±0.03 R☉ |
| Luminosity | 1.68±0.01 L☉ |
| Surface gravity (log g) | 4.22±0.03 cgs |
| Temperature | 5,666±43 K |
| Metallicity [Fe/H] | 0.34±0.01 [2] dex |
| Rotational velocity (v sin i) | 5.6 [5] km/s |
| Age | 6.3±1.0 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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. [2] The distance to this object is 266 light years based on parallax, [1] but it is drifting closer to the Sun with a radial velocity of −14 km/s. [2]
This object is an ordinary G-type main-sequence star with a stellar classification of G5V. It is photometrically-stable star with an inactive chromosphere, and has a much higher than normal metallicity. [3] The star is roughly 6.3 billion years old and is spinning with a projected rotational velocity of 5.6 km/s. [5] 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. [4]
Radial velocity observations of this star during 2000–2001 found a variability that suggesting an orbited sub-stellar companion, designated component 'b'. [3] Additional observations led to a refined orbital period of 432 days with a relatively high eccentricity of 0.52 for a gas giant companion. [7] 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. [8]
| Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | > 1.164±0.067 MJ | 2.07±0.18 | 431.88±0.85 | 0.519±0.027 | — | — |
| c | > 2.17±0.52 MJ | — | 6,700±4,500 | 0.24±0.13 | — | — |
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c Vogt, Steven S.; et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal. 568 (1): 352–362. arXiv: astro-ph/0110378. Bibcode: 2002ApJ...568..352V. doi: 10.1086/338768. S2CID 2272917.
- ^ a b Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv: 1411.4302. Bibcode: 2015A&A...575A..18B. doi: 10.1051/0004-6361/201424951. S2CID 54555839.
- ^ a b Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv: 1611.02897. Bibcode: 2017AJ....153...21L. doi: 10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- ^ "HD 4203". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 November 2019.
- ^ a b Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv: astro-ph/0607493. Bibcode: 2006ApJ...646..505B. doi: 10.1086/504701. S2CID 119067572.
- ^ Kane, Stephen R.; et al. (April 2014). "Limits on Stellar Companions to Exoplanet Host Stars with Eccentric Planets". The Astrophysical Journal. 785 (2): 10. arXiv: 1401.1544. Bibcode: 2014ApJ...785...93K. doi: 10.1088/0004-637X/785/2/93. S2CID 2053475. 93.
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