HD 44219

HD 44219 is a solar-type star[9] with an exoplanetary companion in the equatorial constellation of Monoceros. It has an apparent visual magnitude of 7.69,[2] making it an 8th magnitude star that is too faint to be readily visible to the naked eye. The system is located at a distance of 173 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −12 km/s.[1]

HD 44219
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Monoceros
Right ascension 06h 20m 14.32321s[1]
Declination −10° 43′ 30.0310″[1]
Apparent magnitude (V) 7.69[2]
Characteristics
Spectral type G3V[3]
Apparent magnitude (B) 8.377[2]
Apparent magnitude (J) 6.509±0.029[2]
Apparent magnitude (H) 6.215±0.038[2]
Apparent magnitude (K) 6.115±0.017[2]
B−V color index 0.687±0.007[2]
Astrometry
Radial velocity (Rv)−12.17±0.25[1] km/s
Proper motion (μ) RA: 72.349[1] mas/yr
Dec.: −16.568[1] mas/yr
Parallax (π)18.8732 ± 0.0638 mas[1]
Distance172.8 ± 0.6 ly
(53.0 ± 0.2 pc)
Absolute magnitude (MV)4.18[2]
Details
Mass1.01±0.01[4] M☉
Radius1.37±0.03[4] R☉
Luminosity1.83±0.01[4] L☉
Surface gravity (log g)4.17±0.02[4] cgs
Temperature5,749±45[4] K
Metallicity [Fe/H]0.04±0.01[5] dex
Rotational velocity (v sin i)1.524[6] km/s
Age5.40[7]
9.6±0.7[4] Gyr
Other designations
BD−10°1479, HD 44219, HIP 30114, SAO 151367, PPM 217031[8]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

This is an ordinary G-type main-sequence star with a stellar classification of G3V.[3] L. Casagrande and associates in 2011 estimated the age of the star as 5.4 billion years,[7] while A. Bonfanti and colleagues listed a much greater age of nearly 10 billion years in 2015.[4] It has a near solar metallicity and is spinning with a projected rotational velocity of 1.5 km/s.[5] The star has about the same mass as the Sun but is 37% larger in radius. It is radiating 1.83 times the luminosity of the Sun from its photosphere at an effective temperature of 5,749 K.[4]

In 2009, a Jovian planet was found in a highly eccentric orbit around the star by the HARPS planet search program. There is some evidence of an additional, longer-period companion.[9]

The HD 44219 planetary system[9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥ 0.58+0.06
−0.04 MJ		 1.19±0.02 472.3+6.3
−5.0		 0.61+0.07
−0.09		 — —

See also

References
  1. 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.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  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. S2CID 54555839.
  5. Delgado Mena, E.; et al. (October 2017). "Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program. II. Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd, and Eu". Astronomy & Astrophysics. 606: 20. arXiv:1705.04349. Bibcode:2017A&A...606A..94D. doi:10.1051/0004-6361/201730535. S2CID 118908425. A94.
  6. Costa Silva, A. R.; et al. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur". Astronomy & Astrophysics. 634: 10. arXiv:1912.08659. Bibcode:2020A&A...634A.136C. doi:10.1051/0004-6361/201936523. S2CID 209405391. A136.
  7. Casagrande, L.; et al. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics. 530 (A138): 21. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. S2CID 56118016.
  8. "HD 44219". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-21.
  9. Naef, Dominique; et al. (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics. 523: A15. arXiv:1008.4600. Bibcode:2010A&A...523A..15N. doi:10.1051/0004-6361/200913616. S2CID 118845989.
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