BD+14°4559
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h 13m 35.99s[1] |
| Declination | +14° 41′ 21.8″[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: 235.80 ± 1.21[1] mas/yr Dec.: 1.78 ± 0.97[1] mas/yr |
| Parallax (π) | 20.68 ± 1.24[1] mas |
| Distance | 158 ± 9 ly (48 ± 3 pc) |
| Absolute magnitude (MV) | 6.14 |
| Details | |
| Mass | 0.86 ± 0.15 M☉ |
| Radius | 0.95 ± 0.2 R☉ |
| 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 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
BD+14°4559 is a 10th magnitude K-type main sequence star located approximately 158 light years away in the constellation of Pegasus. On June 10, 2009, an exoplanet (BD+14°4559 b) was found in orbit by Niedzielski et al. using the Hobby-Eberly Telescope.[2]
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[3] and has a surface temperature of 5778 K.[4]
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, BD+14°4559 b, 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
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry - 1 2 3 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.
- ↑ 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.