astro.wikisort.org - Star
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]
| 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 | |
| Database references | |
| SIMBAD | data |
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]
| 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
- Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. 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). arXiv:2208.12720. Bibcode:2022arXiv220812720F. doi:10.3847/1538-4365/ac7e57.
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На других языках
- [en] HD 120084
[ru] HD 120084
HD 120084 — звезда, которая находится в созвездии Малая Медведица на расстоянии около 318 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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