Astronomy:BD+14 4559
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h 13m 35.9901s[1] |
| Declination | +14° 41′ 21.7846″[1] |
| Apparent magnitude (V) | 9.78[2] |
| Characteristics | |
| Spectral type | K2V[3] |
| B−V color index | 1.611±0.218 |
| V−R color index | 0.68[2] |
| R−I color index | 0.50[2] |
| Astrometry | |
| Radial velocity (Rv) | −44.30±0.30[1] km/s |
| Proper motion (μ) | RA: 233.993±0.057[1] mas/yr Dec.: −0.275±0.056[1] mas/yr |
| Parallax (π) | 20.2337 ± 0.0345[1] mas |
| Distance | 161.2 ± 0.3 ly (49.42 ± 0.08 pc) |
| Absolute magnitude (MV) | 6.14 |
| Absolute bolometric magnitude (Mbol) | 5.56[3] |
| Details | |
| Mass | 0.82±0.02[4] M☉ |
| Radius | 0.78±0.02[4] R☉ |
| Luminosity | 0.32±0.01[4] L☉ |
| Luminosity (bolometric) | 0.4786[3] L☉ |
| Surface gravity (log g) | 4.57±0.03[4] cgs |
| Temperature | 4,948±25[4] K |
| Metallicity [Fe/H] | 0.10±0.07[3] dex |
| Age | 6.9±4.2[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
BD+14 4559 is a star with an exoplanetary companion in the northern constellation of Pegasus. During the 2019 NameExoWorlds campaign, the star was named Solaris by Poland after a 1961 science fiction novel about an ocean-covered exoplanet by Polish writer Stanislaw Lem.[6] With an apparent visual magnitude of 9.78,[2] the star is too faint to be viewed with the naked eye. The system is located at a distance of 161 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −44 km/s.[1] It is a high proper motion star,[3] traversing the celestial sphere at an angular rate of 0.234″ yr−1.[7]
This is an ordinary K-type main sequence star with a stellar classification of K2V.[3] The age of the star is poorly constrained, but is estimated to be roughly seven billion years. It has 82% of the mass and 78% of the radius of the Sun.[4] The star is radiating 48%[3] of the net luminosity of the Sun from its photosphere at an effective temperature of 4,948 K.[4] It has a higher metallicity – the abundance of elements of higher atomic number than helium – compared to the Sun.[3]
Planetary system
On June 10, 2009, an exoplanet (Pirx) was found in orbit by Niedzielski et al. using the Hobby-Eberly Telescope.[3] It has a minimum mass of one and a half Jupiter masses (MJ). The orbit of this object is highly eccentric and it spends 65% of its orbital period in the star's habitable zone.[8] A 2020 analysis of data from the Gaia mission has set a 3-sigma upper limit to its mass of 49.83 MJ.[9] There may be an undetected second planet orbiting the star, however this is unconfirmed.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Pirx | >1.52 ± 0.19 MJ | 0.777 | 268.94 ± 0.99 | 0.29 ± 0.03 | >1.769° | — |
| c (unconfirmed) | >2.4 MJ | >2.3 | 800? | — | — | — |
See also
- BD+20°2457
- HD 240210
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Niedzielski, A. et al. (2009). "Substellar-mass Companions to the K-dwarf BD+14 4559 and the K-giants HD 240210 and BD+20 2457". The Astrophysical Journal 707 (1): 768–777. doi:10.1088/0004-637X/707/1/768. Bibcode: 2009ApJ...707..768N.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Bonfanti, A. et al. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics 585: 14. doi:10.1051/0004-6361/201527297. A5. Bibcode: 2016A&A...585A...5B.
- ↑ "9 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=9+Cet.
- ↑ "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results.
- ↑ Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal 129 (3): 1483–1522. doi:10.1086/427854. Bibcode: 2005AJ....129.1483L.
- ↑ Hinkel, Natalie R.; Kane, Stephen R. (September 2013). "Habitability of Exomoons at the Hill or Tidal Locking Radius". The Astrophysical Journal 774 (1): 10. doi:10.1088/0004-637X/774/1/27. 27. Bibcode: 2013ApJ...774...27H.
- ↑ 9.0 9.1 Kiefer, F. et al. (2021). "Determining the true mass of radial-velocity exoplanets with Gaia". Astronomy & Astrophysics 645: A7. doi:10.1051/0004-6361/202039168. Bibcode: 2021A&A...645A...7K.
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