HD 20003

HD 20003 is a star in the southern constellation Hydrus. With an apparent visual magnitude of 8.39,[2] this yellow-hued star is much too faint to be visible to the naked eye. It is located at a distance of 136.6 light years from the Sun based on parallax. HD 20003 is drifting closer with a radial velocity of −16 km/s,[1] and is predicted to come to within 97 light-years in around 1.4 million years from now.[2]

HD 20003
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydrus
Right ascension  03h 07m 37.91875s[1]
Declination −72° 19′ 18.8010″[1]
Apparent magnitude (V) 8.39[2]
Characteristics
Spectral type G8 V[3]
B−V color index 0.771±0.015[2]
Astrometry
Radial velocity (Rv)−16.174±0.0005[1] km/s
Proper motion (μ) RA: +71.893[1] mas/yr
Dec.: −7.995[1] mas/yr
Parallax (π)23.8764 ± 0.0283[1] mas
Distance136.6 ± 0.2 ly
(41.88 ± 0.05 pc)
Absolute magnitude (MV)5.18[2]
Details
Mass0.942±0.046[4] M☉
Radius0.92+0.05
−0.01[1] R☉
Luminosity0.705+0.002
−0.001[1] L☉
Surface gravity (log g)4.423±0.323[4] cgs
Temperature5,510+48
−137[1] K
Metallicity [Fe/H]+0.04±0.03[2] dex
Rotational velocity (v sin i)2.216±0.273[4] km/s
Age5.3+2.8
−2.6[4] Gyr
Other designations
CD−72°148, HD 20003, HIP 14530, SAO 255959[5]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

This object is an ordinary, G-type main-sequence star with a stellar classification of G8 V.[3] It is around five[4] billion years old with a magnetic activity cycle lasting about ten years[6] and a projected rotational velocity of 2.2 km/s.[4] The star has 94%[4] of the mass of the Sun and 92%[1] of the Sun's radius. The metallicity of this star is similar to the Sun, if slightly higher.[2] It is radiating 70.5% of the luminosity of the Sun from its photosphere at an effective temperature of 5,510 K.[1]

The survey in 2015 have ruled out the existence of any stellar companions at projected distances above 18 astronomical units.[7]

Planetary system

HD 20003 has two planets that are at least 12 and 13.4 times as massive as the Earth and have orbital periods of just under 12 and 34 days, respectively. These were detected by the HARPS survey in 2011,[8] and the findings were confirmed using Spitzer.[6]

The HD 20003 planetary system[8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥0.0378±0.0031 MJ 0.0974±0.0016 11.849±0.0028 0.4±0.08 — —
C ≥0.0422±0.004 MJ 0.1961±0.0032 33.823±0.0654 0.16±0.09 — —
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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.
  3. Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. Soto, M. G.; Jenkins, J. S. (July 2018), "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue", Astronomy & Astrophysics, 615: 28, arXiv:1801.09698, Bibcode:2018A&A...615A..76S, doi:10.1051/0004-6361/201731533, A76.
  5. "HD 20003". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-12-20.
  6. Gillon, M.; et al. (May 2017), "The Spitzer search for the transits of HARPS low-mass planets. II. Null results for 19 planets", Astronomy & Astrophysics, 601: 23, arXiv:1701.01303, Bibcode:2017A&A...601A.117G, doi:10.1051/0004-6361/201629270, A117.
  7. Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3). doi:10.1093/mnras/stv771. Retrieved 19 June 2020.
  8. Mayor, M.; et al. (2011). "The HARPS Search for Southern Extra-solar Planets XXXIV. Occurrence, Mass Distribution and Orbital Properties of Super-Earths and Neptune-mass Planets". arXiv:1109.2497 [astro-ph.EP].
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