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.

HD 66428
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
Distance180 ± 10 ly
(55 ± 3 pc)
Details
Mass1.09 ± 0.02[4] M☉
Radius1.13 ± 0.03[4] R☉
Luminosity1.28 ± 0.01[4] L☉
Surface gravity (log g)4.37 ± 0.03[4] cgs
Temperature5773 ± 55[4] K
Age4.1 ± 1.4[4] Gyr
Other designations
BD−00°1891, HIP 39417, LTT 3038, SAO 135426
Database references
SIMBADdata

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]

The HD 66428 planetary system[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 — —
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gollark: The interim is probably worse, since we'll end up still trying to go for "everyone gets a job" even when that's counterproductive.

See also
  • List of extrasolar planets

References
  1. 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
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.


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