HD 93083 / Macondo
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension 10h 44m 20.91513s[1]
Declination –33° 34′ 37.2862″[1]
Apparent magnitude (V) 8.30[2]
Characteristics
Evolutionary stage Main sequence[3]
Spectral type K2IV-V[4] or K3V[5][6]
B−V color index 0.945±0.001[2]
Astrometry
Radial velocity (Rv)43.65[2] km/s
Proper motion (μ) RA: −92.721[1] mas/yr
Dec.: −152.238[1] mas/yr
Parallax (π)35.0393 ± 0.0484 mas[1]
Distance93.1 ± 0.1 ly
(28.54 ± 0.04 pc)
Absolute magnitude (MV)6.08[2]
Details[7]
Mass0.806+0.044
−0.033 M☉[7]
0.837±0.027[8] M☉
Radius0.844±0.011 R☉
Luminosity0.41[6] L☉
Surface gravity (log g)4.367±0.652 cgs
Temperature5,030±25 K
Metallicity [Fe/H]0.13±0.165 dex
Rotational velocity (v sin i)2.219±0.531 km/s
Age6 Gyr[9]
5.485±4.612 Gyr[8]
7.71[5]
13.557+4.008
−4.622[7] Gyr
Other designations
CD−32°7598, GJ 1137, HD 93083, HIP 52521, SAO 201693, PPM 288057, GSC 07190-02048[10]
Database references
SIMBADdata
ARICNSdata

HD 93083 is an orange-hued star in the southern constellation of Antlia. It has the proper name Macondo, after the mythical village of the novel One Hundred Years of Solitude (Cien años de soledad). The name was selected by Colombia during the IAU's NameExoWorlds campaign.[11][12] The star has an apparent visual magnitude of 8.30,[2] which is too faint to be visible to the naked eye. It is located at a distance of 93 light years from the Sun based on parallax. HD 93083 is drifting further away with a radial velocity of +43.65 km/s, having come to within 43 light-years some 484,000 years ago.[2]

This is a K-type main-sequence star that has been assigned a stellar classification of K2IV-V[4] or K3V,[5][6] depending on the study. It is smaller and less massive than the Sun, with a higher metallicity, or abundance of elements heavier than helium.[7] The star is roughly six billion years old with a low projected rotational velocity of 2.2 km/s, and has an expected main sequence lifetime of 20.4 billion years.[3] It is a source of X-ray emission with a luminosity of 7.9×1026 erg s−1.[5] The star is radiating around 41%[6] of the luminosity of the Sun from its photosphere at an effective temperature of 5,030 K.[7]

Planetary system

In 2005, the discovery of an exoplanet orbiting the star was announced. This is another discovery using the radial velocity method with the HARPS spectrograph.[6] The planet was given the name Melquíades by the IAU after a character in the book One Hundred Years of Solitude.[11] The orbit of this body lies entirely within the habitable zone of the host star, and it is theoretically possible that a large moon orbiting the body, or a hypothetical terrestrial exoplanet at a trojan point, is habitable.[3]

The HD 93083 planetary system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Melquíades 0.37 MJ 0.477 143.58 ± 0.60 0.14 ± 0.03 — —

See also

References

  1. 1 2 3 4 5 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. 1 2 3 4 5 6 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. 1 2 3 Schwarz, R.; et al. (November 2007). "Survey of the stability region of hypothetical habitable Trojan planets". Astronomy and Astrophysics. 474 (3): 1023–1029. Bibcode:2007A&A...474.1023S. doi:10.1051/0004-6361:20077994.
  4. 1 2 Gray, R. O.; et al. (October 2003), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I.", The Astronomical Journal, 126 (4): 2048–2059, arXiv:astro-ph/0308182, Bibcode:2003AJ....126.2048G, doi:10.1086/378365, S2CID 119417105
  5. 1 2 3 4 Sanz-Forcada, J.; et al. (September 2010). "A scenario of planet erosion by coronal radiation (Corrigendum)". Astronomy and Astrophysics. 520: 2. Bibcode:2010A&A...520C...1S. doi:10.1051/0004-6361/200913670e. C1.
  6. 1 2 3 4 5 6 Lovis, C.; et al. (2005). "The HARPS search for southern extra-solar planets III. Three Saturn-mass planets around HD 93083, HD 101930 and HD 102117". Astronomy and Astrophysics. 437 (3): 1121–1126. arXiv:astro-ph/0503660. Bibcode:2005A&A...437.1121L. doi:10.1051/0004-6361:20052864. S2CID 119492030.
  7. 1 2 3 4 5 Soto, M. G.; Jenkins, J. S. (2018). "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue". Astronomy and Astrophysics. 615: A76. arXiv:1801.09698. Bibcode:2018A&A...615A..76S. doi:10.1051/0004-6361/201731533. S2CID 119107228.
  8. 1 2 Delgado Mena, E.; et al. (April 2019), "Abundance to age ratios in the HARPS-GTO sample with Gaia DR2. Chemical clocks for a range of [Fe/H]", Astronomy & Astrophysics, 624: 24, arXiv:1902.02127, Bibcode:2019A&A...624A..78D, doi:10.1051/0004-6361/201834783, S2CID 90259810, A78
  9. ↑ Saffe, C.; et al. (2005). "On the Ages of Exoplanet Host Stars". Astronomy and Astrophysics. 443 (2): 609–626. arXiv:astro-ph/0510092. Bibcode:2005A&A...443..609S. doi:10.1051/0004-6361:20053452. S2CID 11616693.
  10. ↑ "HD 93083". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-26.
  11. 1 2 "Approved names". NameExoworlds. IAU. Retrieved 2020-01-02.
  12. ↑ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
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