HD 120084

HD 120084
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Ursa Minor
Right ascension	13h 42m 39.201616s[1]
Declination	+78° 03′ 51.979994″[1]
Apparent magnitude (V)	5.91[2]
Characteristics
Spectral type	G7III[2]
B−V color index	1.000[2]
Astrometry
Radial velocity (Rv)	−8.97±0.13[1] km/s
Proper motion (μ)	RA: −64.900±0.031 mas/yr[1] ; Dec.: 46.164±0.033 mas/yr[1]
Parallax (π)	9.6277 ± 0.0258 mas[1]
Distance	338.8 ± 0.9 ly ; (103.9 ± 0.3 pc)
Absolute magnitude (MV)	+0.96[2]
Details[2]
Mass	2.39 (2.09–2.45) M☉
Radius	9.12 (8.51–9.77) R☉
Luminosity	43.7 L☉
Surface gravity (log g)	2.71±0.08 cgs
Temperature	4892±22 K
Metallicity [Fe/H]	+0.09±0.05 dex
Rotational velocity (v sin i)	2.44 km/s
Other designations
	BD+78°466, FK5 3090, HIP 66903, SAO 7876[3]
Database references
SIMBAD	data

HD 120084 is a star in the constellation of Ursa Minor. With an apparent magnitude of 5.91,[2] it is just visible to the naked eye in suburban skies.[4]

It is a yellow giant of spectral type G7III and surface temperature of around 4892 K, around 2.4 times the mass, 43 times the luminosity and 9 times the radius of the Sun. There is one planet known to orbit this star.[2]

Planetary system

A planet with at least 4.5 times the mass of Jupiter and a highly eccentric orbit (with an eccentricity of 0.66) was discovered by precisely measuring the radial velocity of the star in 2013. With an average distance of 4.5 AU from its star, this planet has one of the most eccentric orbits discovered.[2] In 2022, the inclination and true mass of HD 120084 b were measured via astrometry.[5]

The HD 120084 planetary system[5]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (years)	Eccentricity	Inclination	Radius
b	5.762+4.638 −0.285 M_J	4.341+0.133 −0.155	5.709+0.057 −0.088	0.732±0.123	110.934+33.840 −60.717°	—

References

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.
Sato, Bun’ei; et al. (2013). "Planetary Companions to Three Evolved Intermediate-Mass Stars: HD 2952, HD 120084, and ω Serpentis". Publications of the Astronomical Society of Japan. 65 (4). 85. arXiv:1304.4328. Bibcode:2013PASJ...65...85S. doi:10.1093/pasj/65.4.85.
"HD 120084". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-07.
Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Retrieved 2013-02-20.
Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21): 21. arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57. S2CID 251864022.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.

[Gaia_DR3-1] 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.

[Sato2013-2] Sato, Bun’ei; et al. (2013). "Planetary Companions to Three Evolved Intermediate-Mass Stars: HD 2952, HD 120084, and ω Serpentis". Publications of the Astronomical Society of Japan. 65 (4). 85. arXiv:1304.4328. Bibcode:2013PASJ...65...85S. doi:10.1093/pasj/65.4.85.

[Simbad-3] "HD 120084". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-07.

[4] Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Retrieved 2013-02-20.

[Feng2022-5] Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21): 21. arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57. S2CID 251864022.