BD+14 4559
BD+14 4559, named Solaris,[3] is a 10th magnitude K-type main sequence star located approximately 161 light years away in the constellation of Pegasus. On June 10, 2009, an exoplanet (Pirx) was found in orbit by Niedzielski et al. using the Hobby-Eberly Telescope.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h 13m 35.9901s[1] |
| Declination | +14° 41′ 21.7846″[1] |
| Apparent magnitude (V) | 9.63 |
| Characteristics | |
| Spectral type | K2V |
| B−V color index | 1.00 |
| V−R color index | 0.56 |
| R−I color index | 0.5 |
| Variable type | none |
| Astrometry | |
| 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[2] |
| Details | |
| Mass | 0.86 ± 0.15 M☉ |
| Radius | 0.95 ± 0.2 R☉ |
| Luminosity (bolometric) | 0.4786[2] L☉ |
| Surface gravity (log g) | 4.60 ± 0.05 cgs |
| Temperature | 5008 ± 20 K |
| Metallicity [Fe/H] | 0.10 ± 0.07 dex |
| Age | ~3 Gyr |
| Other designations | |
Solaris, HIP 104780, PPM 139779 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
The star BD+14 4559 was named during the NameExoWorlds campaign by Poland. Solaris is the title of a 1961 science fiction novel about an ocean-covered exoplanet by Polish writer Stanislaw Lem.[3]
Stellar characteristics
BD+14 4559 is a K-type star that is approximately 86% the mass of and 95% the radius of the Sun. It has a surface temperature of 5008 K and is likely about 3 billion years old based on its characteristics. In comparison, the Sun is about 4.6 billion years old[4] and has a surface temperature of 5778 K.[5]
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 9.63. Therefore, it is too dim to be seen with the naked eye, but can be seen with good binoculars.
Planetary system
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.47 MJ | 0.777 | 268.94 ± 0.99 | 0.29 ± 0.03 | — | — |
| c (unconfirmed) | >2.4 MJ | >2.3 | 800? | — | — | — |
The star is known to host one planet, Pirx, and is 47% more massive than Jupiter. It orbits within the habitable zone of its parent star at a distance of 0.77 AU, somewhat close to the orbital distance of Venus.
Based on observations, there may be an undetected second planet orbiting the star, however this is unconfirmed.[2]
See also
- BD+20°2457
- HD 240210
- List of extrasolar planets
References
- 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.
- 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. arXiv:0906.1804. Bibcode:2009ApJ...707..768N. doi:10.1088/0004-637X/707/1/768.
- "Approved names". NameExoworlds. Retrieved 2020-01-02.
- Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
- Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.