HD 23079

HD 23079 is a star in the southern constellation of Reticulum. Since the star has an apparent visual magnitude of 7.12,[2] it is not visible to the naked eye, but at least in binoculars it should be easily visible. Parallax measurements give a distance estimate of 109 light years from the Sun. it is slowly drifting further away with a radial velocity of +0.65 km/s.[1]

HD 23079 / Tupi
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Reticulum
Right ascension 03h 39m 43.0961s[1]
Declination −52° 54′ 57.0161″[1]
Apparent magnitude (V) 7.12[2]
Characteristics
Spectral type F9.5V[3]
B−V color index 0.583±0.009[2]
Astrometry
Radial velocity (Rv)+0.648±0.0004[1] km/s
Proper motion (μ) RA: −192.877±0.060[1] mas/yr
Dec.: −92.103±0.062[1] mas/yr
Parallax (π)29.8583 ± 0.0309 mas[1]
Distance109.2 ± 0.1 ly
(33.49 ± 0.03 pc)
Absolute magnitude (MV)4.47[2]
Details[4]
Mass1.01±0.02 M☉
Radius1.08±0.02 R☉
Luminosity1.372±0.005 L☉
Surface gravity (log g)4.37±0.04 cgs
Temperature6,003±36 K
Metallicity [Fe/H]−0.12±0.01[2] dex
Rotational velocity (v sin i)1.281±0.160[5] km/s
Age5.1±1.0 Gyr
Other designations
Tupi, CD–53°738, GC 4401, HD 23079, HIP 17096, SAO 233208, LTT 1739[6]
Database references
SIMBADdata

This object is an inactive F-type main sequence star with a stellar classification of F9.5V;[3] in between F8 and G0. This indicates it is generating energy through core hydrogen fusion. The star is similar to the Sun, but is slightly hotter and more massive.[7] It is about 5.1 billion years old[4] and it is spinning slowly with a projected rotational velocity of 1.3 km/s.[5] The metallicity of this star is below solar, meaning the abundance of elements other than hydrogen and helium is lower than in the Sun.[2]

The star HD 23079 is named Tupi. The name was selected in the NameExoWorlds campaigns by Brazil during the 100th anniversary of the IAU. The star is named after the Tupi people, an indigenous group.[8][9]

Planetary system

In October 2001, a giant planet orbiting the star was announced.[10] The orbit of this object is similar to that of Mars, and the presence of such a large planet would have a strong impact on an Earth-like planet in the habitable zone of this Star.[7]

The HD 23079 planetary system[11]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Guarani ≥2.41±0.06 MJ 1.586±0.003 724.5±2.2 0.087±0.031 — —

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. S2CID 119257644.
  3. Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637.
  4. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  5. 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.
  6. "HD 23079". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-24.
  7. Eberle, J.; Cuntz, M.; Quarles, B.; Musielak, Z. E. (October 2011). "Case studies of habitable Trojan planets in the system of HD 23079". International Journal of Astrobiology. 10 (4): 325–334. arXiv:1104.3092. Bibcode:2011IJAsB..10..325E. doi:10.1017/S1473550411000176. S2CID 118568335.
  8. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  9. "Approved names". NameExoworlds. Retrieved 2020-01-02.
  10. Tinney, C. G.; et al. (2002). "Two Extrasolar Planets from the Anglo-Australian Planet Search". The Astrophysical Journal. 571 (1): 528–531. arXiv:astro-ph/0111255. Bibcode:2002ApJ...571..528T. doi:10.1086/339916.
  11. Wittenmyer, Robert A.; et al. (2020). "Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search". Monthly Notices of the Royal Astronomical Society. 492 (1): 377–383. arXiv:1912.01821. Bibcode:2020MNRAS.492..377W. doi:10.1093/mnras/stz3436. S2CID 208617606.
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