HD 20003

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 mas[1]
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
Temperature5494±27[5] K
Metallicity [Fe/H]+0.04±0.02[5] dex
Rotation38.9±4 d[5]
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, 2MASS J21281220-2143340[6]
Database references
SIMBADdata
Exoplanet Archivedata

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]

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[7] 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.[8]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1979 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference Soto2018 was invoked but never defined (see the help page).
  5. ^ a b c Udry, S.; Dumusque, X.; Lovis, C.; Ségransan, D.; Diaz, R. F.; Benz, W.; Bouchy, F.; Coffinet, A.; Lo Curto, G.; Mayor, M.; Mordasini, C.; Motalebi, F.; Pepe, F.; Queloz, D.; Santos, N. C.; Wyttenbach, A.; Alonso, R.; Collier Cameron, A.; Deleuil, M.; Figueira, P.; Gillon, M.; Moutou, C.; Pollacco, D.; Pompei, E. (2019), "The HARPS search for southern extra-solar planets", Astronomy & Astrophysics, 622: A37, arXiv:1705.05153, Bibcode:2019A&A...622A..37U, doi:10.1051/0004-6361/201731173
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Gillon2017 was invoked but never defined (see the help page).
  8. ^ 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): 3127–3136. Bibcode:2015MNRAS.450.3127M. doi:10.1093/mnras/stv771. hdl:1887/49340. Retrieved 19 June 2020.