Astronomy:HD 46375
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 33m 12.62259s[1] |
| Declination | +05° 27′ 46.5278″[1] |
| Apparent magnitude (V) | 7.91[2] |
| Characteristics | |
| Spectral type | G9V[3] + M0V[4] |
| B−V color index | 0.860[2] |
| Variable type | Constant[5] |
| Astrometry | |
| Radial velocity (Rv) | −1.07±0.20[1] km/s |
| Proper motion (μ) | RA: +111.477[1] mas/yr Dec.: –96.918[1] mas/yr |
| Parallax (π) | 33.8088 ± 0.0435[1] mas |
| Distance | 96.5 ± 0.1 ly (29.58 ± 0.04 pc) |
| Absolute magnitude (MV) | 5.20[2] |
| Details | |
| A | |
| Mass | 0.91±0.01[6] M☉ |
| Radius | 1.01±0.01[6] R☉ |
| Luminosity | 0.77±0.01[6] L☉ |
| Surface gravity (log g) | 4.38±0.01[6] cgs |
| Temperature | 3,663±15[7] K |
| Metallicity [Fe/H] | +0.27±0.06[3] dex |
| Rotation | 42+9 −7[8] |
| Rotational velocity (v sin i) | 0.86[9] km/s |
| Age | 2.6±0.8 Gyr[8] 4.38±2.54 Gyr[3] 11.9±1.1[6] Gyr |
| B | |
| Mass | 0.576±0.013[10] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 46375 is double star[10] with an exoplanetary companion in the equatorial constellation of Monoceros. It presents as an 8th-magnitude star with an apparent visual magnitude of 7.91,[2] which is too dim to be readily visible to the naked eye. The system is located at a distance of 96.5 light-years from the Sun based on parallax measurements,[1] but is slowly drifting closer with a radial velocity of −1 km/s.[1] The common proper motion stellar companion, designated HD 46375 B, has a linear projected separation of 346±13 astronomical unit|AU.[10]
The primary component is a solar-type[8] star with a stellar classification of G9V,[3] matching a G-type main-sequence star. Age estimates for this star range from 2.6[8] up to 11.9[6] billion years. It is a chromospherically inactive star and is spinning slowly[5] with a projected rotational velocity of 0.86 km/s.[9] The absolute magnitude of this star places it one magnitude brighter than the equivalent for a zero age main sequence.[5] It has 91% of the mass and 101% of the radius of the Sun. The star is radiating 77%[6] of the luminosity of the Sun from its photosphere at an effective temperature of 3,663 K.[7]
This star has sometimes been classified as a member of the NGC 2244 star cluster in the Rosette Nebula, but in reality it just happens to lie in the foreground. The distance to the cluster is much greater, about 4500 light-years.
Planetary system
On March 29, 2000, the planet HD 46375 b with a minimum mass three quarters that of Saturn was discovered by Marcy, Butler, and Vogt in California , together with 79 Ceti b.[12][5] This planet was discovered using the "wobble method" or radial velocity method, which calculates the rate and shape of the stellar wobble caused by the revolving planet's gravity.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.226 ± 0.019 MJ | 0.0398 ± 0.0023 | 3.023573 ± 0.000065 | 0.063 ± 0.026 | — | — |
See also
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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 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 3.2 3.3 Grieves, N. et al. (December 2018). "Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey". Monthly Notices of the Royal Astronomical Society 481 (3): 3244–3265. doi:10.1093/mnras/sty2431. Bibcode: 2018MNRAS.481.3244G.
- ↑ Terrien, Ryan C. et al. (March 2012). "An H-band Spectroscopic Metallicity Calibration for M Dwarfs". The Astrophysical Journal Letters 747 (2): 6. doi:10.1088/2041-8205/747/2/L38. L38. Bibcode: 2012ApJ...747L..38T.
- ↑ 5.0 5.1 5.2 5.3 Marcy, Geoffrey W. et al. (2000). "Sub-Saturn Planetary Candidates of HD 16141 and HD 46375". The Astrophysical Journal Letters 536 (1): L43–L46. doi:10.1086/312723. PMID 10849416. Bibcode: 2000ApJ...536L..43M.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Bonfanti, A. et al. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics 585: 14. doi:10.1051/0004-6361/201527297. A5. Bibcode: 2016A&A...585A...5B.
- ↑ 7.0 7.1 Rojas-Ayala, Bárbara et al. (April 2012), "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs", The Astrophysical Journal 748 (2): 93, doi:10.1088/0004-637X/748/2/93, Bibcode: 2012ApJ...748...93R.
- ↑ 8.0 8.1 8.2 8.3 Gaulme, P.; Deheuvels, S.; Weiss, W. W.; Mosser, B.; Moutou, C.; Bruntt, H.; Donati, J. -F.; Vannier, M. et al. (December 2010). "HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet". Astronomy and Astrophysics 524: 8. doi:10.1051/0004-6361/201014142. A47. Bibcode: 2010A&A...524A..47G.
- ↑ 9.0 9.1 9.2 Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode: 2006ApJ...646..505B.
- ↑ 10.0 10.1 10.2 Mugrauer, M. et al. (May 2006). "A search for wide visual companions of exoplanet host stars: The Calar Alto Survey". Astronomische Nachrichten 327 (4): 321. doi:10.1002/asna.200510528. Bibcode: 2006AN....327..321M.
- ↑ "HD 46375". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+46375.
- ↑ "Keck astronomers discover planets smaller than saturn" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. March 29, 2000. Retrieved August 13, 2019.
External links
- "Notes for star HD 46375". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+46375. Retrieved 2008-08-23.
Coordinates: 
06h 33m 12.6237s, +05° 27′ 46.532″
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