Astronomy:HD 44219
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 172.8 ± 0.6 ly (53.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 4.18[2] |
| Details | |
| Mass | 1.01±0.01[4] M☉ |
| Radius | 1.37±0.03[4] R☉ |
| Luminosity | 1.83±0.01[4] L☉ |
| Surface gravity (log g) | 4.17±0.02[4] cgs |
| Temperature | 5,749±45[4] K |
| Metallicity [Fe/H] | 0.04±0.01[5] dex |
| Rotational velocity (v sin i) | 1.524[6] km/s |
| Age | 5.40[7] 9.6±0.7[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
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]
Characteristics
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]
Planetary system
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]
| 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
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B. http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html.
- ↑ 5.0 5.1 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. doi:10.1051/0004-6361/201730535. A94. Bibcode: 2017A&A...606A..94D.
- ↑ 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. doi:10.1051/0004-6361/201936523. A136. Bibcode: 2020A&A...634A.136C.
- ↑ 7.0 7.1 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. doi:10.1051/0004-6361/201016276. Bibcode: 2011A&A...530A.138C.
- ↑ "HD 44219". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+44219.
- ↑ 9.0 9.1 9.2 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. doi:10.1051/0004-6361/200913616. Bibcode: 2010A&A...523A..15N.
Coordinates: 
06h 20m 14.3225s, −10° 43′ 30.032″
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