HD 66428
HD 66428 is a G-type main sequence star located approximately 179 light-years away in the constellation of Monoceros. This star is similar to our Sun with an apparent magnitude of 8.25, an effective temperature of 5705 ± 27 K and a solar luminosity 1.28. Its absolute magnitude is 11.1 while its U-V color index is 0.71. It is considered an inactive star and it is metal-rich ([Fe/H] = 0.310).[2][3][5] This star has a precise mass of 1.14552 solar masses. This precision comes from the Corot mission that measured asteroseismology.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 08h 03m 28.666s[1] |
| Declination | −01° 09′ 45.75″[1] |
| Apparent magnitude (V) | 8.25[2] |
| Characteristics | |
| Spectral type | G5[3] |
| Astrometry | |
| Proper motion (μ) | RA: −67.78±1.05[1] mas/yr Dec.: −207.18±0.84[1] mas/yr |
| Parallax (π) | 18.21 ± 1.07[1] mas |
| Distance | 180 ± 10 ly (55 ± 3 pc) |
| Details | |
| Mass | 1.09 ± 0.02[4] M☉ |
| Radius | 1.13 ± 0.03[4] R☉ |
| Luminosity | 1.28 ± 0.01[4] L☉ |
| Surface gravity (log g) | 4.37 ± 0.03[4] cgs |
| Temperature | 5773 ± 55[4] K |
| Age | 4.1 ± 1.4[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system
In July 2006, the discovery of the extrasolar planet HD 66428 b was published in the Astrophysical Journal. It was found from observations at the W. M. Keck Observatory using the radial velocity method. It has a minimum mass of more than 3 times that of Jupiter and orbits at a distance of 3.47 AU away from the star.[2][6]
In 2015 a refined orbit was determined which led to the discovery of a linear trend in the radial velocities indicating a more distant companion of unknown character.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >3.194±0.060 MJ | 3.471±0.069 | 2293.9±6.4 | 0.440±0.013 | — | — |
See also
- List of extrasolar planets
References
- 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
- 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.
- Kashyap, V.L.; et al. (2008). "Extrasolar Giant Planets and X-Ray Activity". Astrophysical Journal. 687 (2): 1339–1356. arXiv:0807.1308. Bibcode:2008ApJ...687.1339K. doi:10.1086/591922.
- 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.
- Sousa, S.G.; et al. (2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program". Astronomy and Astrophysics. 487: 373–381. arXiv:0805.4826. Bibcode:2008A&A...487..373S. doi:10.1051/0004-6361:200809698.
- Feng, Y. Katherina; et al. (2015). "The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets". The Astrophysical Journal. 800 (1). 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22.
External links
- "Notes for star HD 66428". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-20.