HD 16175

HD 16175 is a 7th magnitude G-type star with temperature about 6000 K located 196 light-years (60 parsecs) away^[1] in the Andromeda constellation. This star is only visible through binoculars or better equipment; it is also 3.3 times more luminous, is 1.34 times more massive, and has a radius 1.66 times bigger than our local star.^[5]

HD 16175 / Buna

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Andromeda
Right ascension	02h 37m 01.91118s[1]
Declination	+42° 03′ 45.4685″[1]
Apparent magnitude (V)	7.28[2]
Characteristics
Spectral type	F8 IV[3]
B−V color index	0.64[2]
Astrometry
Radial velocity (Rv)	21.83±0.14[1] km/s
Proper motion (μ)	RA: −38.864 mas/yr[1] Dec.: −41.234 mas/yr[1]
Parallax (π)	16.6670 ± 0.0279 mas[1]
Distance	195.7 ± 0.3 ly (60.0 ± 0.1 pc)
Absolute magnitude (MV)	3.40[4]
Details
Mass	1.34 ± 0.01[5] M☉
Radius	1.66 ± 0.04[5] R☉
Luminosity	3.3 ± 0.01[5] L☉
Surface gravity (log g)	4.12 ± 0.03[5] cgs
Temperature	6048 ± 35[5] K
Age	3.2 ± 0.2[5] Gyr
Other designations
BD+41°496, HIP 12191, SAO 38170
Database references
SIMBAD	data

The star HD 16175 is named Buna. The name was selected in the NameExoWorlds campaign by Ethiopia, during the 100th anniversary of the IAU. Buna is the commonly used word for coffee in Ethiopia.^[6][7]

Planetary system

The discovery of the exoplanet HD 16175 b was published in the June 2009 issue of the Publications of the Astronomical Society of the Pacific.^[4] The planetary parameters were updated in 2016.^[8] In 2023, the inclination and true mass of HD 16175 b were determined via astrometry.^[9]

The HD 16175 planetary system^[9]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (years)	Eccentricity	Inclination	Radius
b / Abol	5.9+1.8 −1.0 MJ	2.13+0.075 −0.08	2.686+0.031 −0.039	0.675±0.026	59+20 −19 or 121+19 −20°	—

See also

• HD 96167
• List of extrasolar planets

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H.
3. Van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. arXiv:0901.1206. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. S2CID 18370219.
4. Peek, Kathryn M. G.; et al. (2009). "Old, rich, and eccentric: two jovian planets orbiting evolved metal-rich stars". Publications of the Astronomical Society of the Pacific. 121 (880): 613–620. arXiv:0904.2786. Bibcode:2009PASP..121..613P. doi:10.1086/599862. S2CID 12042779.
5. 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. S2CID 54555839.
6. "Approved names". NameExoworlds. Retrieved 2020-01-02.
7. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
8. Díaz, Rodrigo F.; Rey, Javiera; Demangeon, Olivier D. S.; Hébrard, Guillaume; Boisse, Isabelle; Arnold, Luc; Astudillo-Defru, Nicola; Beuzit, Jean-Luc; Bonfils, Xavier; Borgniet, Simon; Bouchy, François; Bourrier, Vincent; Courcol, Bastien; Deleuil, Magali; Delfosse, Xavier; Ehrenreich, David; Forveille, Thierry; Lagrange, Anne-Marie; Mayor, Michel; Moutou, Claire; Pepe, Francesco; Queloz, Didier; Santerne, Alexandre; Santos, Nuno C.; Sahlmann, Johannes; Ségransan, Damien; Udry, Stéphane; Wilson, Paul A. (2016). "The SOPHIE search for northern extrasolar planets XI. Three new companions and an orbit update: Giant planets in the habitable zone". Astronomy & Astrophysics. 591: A146. arXiv:1604.07610. Bibcode:2016A&A...591A.146D. doi:10.1051/0004-6361/201628331. S2CID 3282336.
9. Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5): 055022. arXiv:2303.12409. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e.

External links

• "Notes for star HD 16175". Extrasolar Planets Encyclopaedia. Archived from the original on November 6, 2007. Retrieved 2008-08-24.