| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h13m 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 mas/yr[1] Dec.: −0.275±0.056 mas/yr[1] |
| Parallax (π) | 20.2337 ± 0.0345 mas[1] |
| 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 | |
Solaris, AG+14 2370, BD+14 4559, HIP 104780, PPM 139779, LTT 16221[5] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
BD+14 4559 is a star with an exoplanetary companion in the northern constellationofPegasus. During the 2019 NameExoWorlds campaign, the star was named SolarisbyPoland after a 1961 science fiction novel about an ocean-covered exoplanet by Polish writer Stanisław 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 rateof0.234″ 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]
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? | — | — | — |
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