astro.wikisort.org - Planet
HD 109271 is a star in the constellation of Virgo. With an apparent magnitude of 8.05,[2] it cannot be seen with the naked eye. Parallax measurements made by Gaia put the star at a distance of 182 light-years (56.0 parsecs) away.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 33m 35.5543s[1] |
| Declination | −11° 37′ 18.7272″[1] |
| Apparent magnitude (V) | 8.05 ± 0.01[2] |
| Characteristics | |
| Spectral type | G5 V[2] |
| B−V color index | +0.658 ± 0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | −5.10 ± 0.3[3] km/s |
| Proper motion (μ) | RA: −169.693±0.114[1] mas/yr Dec.: 80.882±0.108[1] mas/yr |
| Parallax (π) | 17.8697 ± 0.0660 mas[1] |
| Distance | 182.5 ± 0.7 ly (56.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 4.1 ± 0.1[2] |
| Details[2] | |
| Mass | 1.047 ± 0.024 M☉ |
| Luminosity | 2.0 ± 0.3 L☉ |
| Surface gravity (log g) | 4.28 ± 0.10 cgs |
| Temperature | 5783 ± 62 K |
| Metallicity [Fe/H] | 0.10 ± 0.05 dex |
| Rotational velocity (v sin i) | 2.7 km/s |
| Age | 7.3 ± 1.2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 109271 is a typical G-type main-sequence star. It has a mass of 1.047 M☉, but is twice as luminous as the Sun. It is also much older, at an age of 7.3 billion years.[2]
In 2020, a red dwarf companion of 0.6M☉ was found orbiting HD 109271 at projected separation 304 AU.[4]
Planetary system
From 2003 to 2012, the star was under observance from the High Accuracy Radial Velocity Planet Searcher (HARPS).[2]
In 2012, two eccentric hot Neptune-mass planets were deduced by radial velocity. They were published in January 2013. These are close to a 1:4 resonance. The system is like HD 69830.
A third Neptune in the Venus zone was hypothesised from the data.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.054 ± 0.004 MJ | 0.079 ± 0.001 | 7.8543 ± 0.0009 | 0.25 ± 0.08 | — | — |
| c | >0.076 ± 0.007 MJ | 0.196 ± 0.003 | 30.93 ± 0.02 | 0.15 ± 0.09 | — | — |
| d (unconfirmed) | >1.3 neptune MJ | 1 | 430 | 0.36 | — | — |
References
- 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.
- G. Lo Curto; et al. (2013). "The HARPS search for southern extrasolar planets: XXXVI. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone". Astronomy & Astrophysics. 551: A59. arXiv:1301.2741. Bibcode:2013A&A...551A..59L. doi:10.1051/0004-6361/201220415. S2CID 116916728.
- Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- Ginski, Christian; Mugrauer, Markus; Adam, Christian; Vogt, Nikolaus; Rob van Holstein (2021), "How many suns are in the sky? A SPHERE multiplicity survey of exoplanet host stars", Astronomy & Astrophysics, 649: A156, arXiv:2009.10363, doi:10.1051/0004-6361/202038964, S2CID 221836281
- "Planet HD 109271 b". The Extrasolar Planets Encyclopaedia. Retrieved 3 September 2017.
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HD 109271 — звезда, которая находится в созвездии Дева на расстоянии около 202 световых лет от нас. Вокруг звезды обращаются, как минимум, две планеты.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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