HD 66428

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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

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.

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] which was determined to be a gas giant planet HD 66428 c or brown dwarf in 2021.[7]

The HD 66428 planetary system[6][7]
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 — —
c 27+22
−17 MJ 		23.0+19.0
−7.6 		39000+56000
−18000 		0.32+0.23
−0.16 		— —

See also[]

  • List of extrasolar planets

References[]

  1. ^ a b c d e 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. S2CID 18759600. Vizier catalog entry
  2. ^ a b c 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. S2CID 119067572.
  3. ^ a b 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. S2CID 17515630.
  4. ^ a b c d e f 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. S2CID 54555839.
  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. S2CID 18173201.
  6. ^ a b c 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. S2CID 56390823.
  7. ^ a b Rosenthal, Lee J.; Fulton, Benjamin J.; Hirsch, Lea A.; Isaacson, Howard T.; Howard, Andrew W.; Dedrick, Cayla M.; Sherstyuk, Ilya A.; Blunt, Sarah C.; Petigura, Erik A.; Knutson, Heather A.; Behmard, Aida; Chontos, Ashley; Crepp, Justin R.; Crossfield, Ian J. M.; Dalba, Paul A.; Fischer, Debra A.; Henry, Gregory W.; Kane, Stephen R.; Kosiarek, Molly; Marcy, Geoffrey W.; Rubenzahl, Ryan A.; Weiss, Lauren M.; Wright, Jason T. (2021), The California Legacy Survey I. A Catalog of 177 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades, arXiv:2105.11583

External links[]

Coordinates: Sky map 08h 03m 28.6652s, −01° 09′ 45.752″


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