Astronomy:HD 120084
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas/yr Dec.: 46.164±0.033[1] mas/yr |
| Parallax (π) | 9.6277 ± 0.0258[1] mas |
| Distance | 338.8 ± 0.9 ly (103.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.96[2] |
| Details | |
| Mass | 1.93[3] M☉ |
| Radius | 7.81[3] R☉ |
| Luminosity | 43.7[2] L☉ |
| Surface gravity (log g) | 2.94±0.14[3] cgs |
| Temperature | 4,969±40[3] K |
| Metallicity [Fe/H] | 0.12±0.03[3] dex |
| Rotational velocity (v sin i) | 2.44[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 120084 is a star with an orbiting exoplanet[2] in the northern constellation of Ursa Minor. With an apparent magnitude of 5.91,[2] it is just visible to the naked eye in suburban skies.[5] The distance to this system is 339 light years based on parallax measurements, but it is drifting closer to the Sun with a radial velocity of −9 km/s.[1]
This is an evolved G-type giant star, a yellow giant, with a stellar classification of G7III.[2] It has an effective temperature of around 4892 K, with around 1.9 times the mass, 43 times the luminosity and 8 times the radius of the Sun.[2][3]
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.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.762+4.638 −0.285 MJ |
4.341+0.133 −0.155 |
5.709+0.057 −0.088 |
0.732±0.123 | 110.934+33.840 −60.717° |
— |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 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. doi:10.1093/pasj/65.4.85. Bibcode: 2013PASJ...65...85S. https://academic.oup.com/pasj/article/65/4/85/1531866/.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Andreasen, D. T. et al. (2017), "SWEET-Cat update and FASMA A new minimization procedure for stellar parameters using high-quality spectra", Astronomy & Astrophysics A69: 600, doi:10.1051/0004-6361/201629967, Bibcode: 2017A&A...600A..69A
- ↑ "HD 120084". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+120084.
- ↑ Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. http://www.skyandtelescope.com/resources/darksky/3304011.html?page=1&c=y. Retrieved 2013-02-20.
- ↑ 6.0 6.1 Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F.
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