astro.wikisort.org - Star
HD 168746 is an 8th magnitude star in the constellation of Serpens. It is very similar to the Sun, a yellow dwarf star (spectral class G5V). It is not visible to the unaided eye, but is easily visible with binoculars or a small telescope. In 2000 a planet was announced orbiting it.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 18h 21m 49.7827s[1] |
| Declination | −11° 55′ 21.652″[1] |
| Apparent magnitude (V) | 7.95[2] |
| Characteristics | |
| Spectral type | G5V[2] |
| B−V color index | 0.713[2] |
| Astrometry | |
| Radial velocity (Rv) | −25.606±0.0003[1] km/s |
| Proper motion (μ) | RA: −22.946±0.054[1] mas/yr Dec.: −68.402±0.040[1] mas/yr |
| Parallax (π) | 24.0282 ± 0.0573 mas[1] |
| Distance | 135.7 ± 0.3 ly (41.62 ± 0.10 pc) |
| Absolute magnitude (MV) | 4.78[2] |
| Details[2] | |
| Mass | 0.88±0.01 M☉ |
| Luminosity | 1.10 L☉ |
| Surface gravity (log g) | 4.50±0.15 cgs |
| Temperature | 5610±30 K |
| Metallicity [Fe/H] | −0.06±0.05 dex |
| Rotational velocity (v sin i) | 1.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
In 2019 the HD 168746 planetary system was chosen as part of the NameExoWorlds campaign organised by the International Astronomical Union to mark to 100th anniversary of the organisation. Each country was assigned a star and planet to be named with HD 168746 being assigned to Cyprus. The winning proposal named the star Alasia, an ancient name for Cyprus, and the planet Onasilos after an ancient Cypriot physician identified in the Idalion Tablet, one of the oldest known legal contracts.
Planetary system
The planet HD 168746 b was discovered by Exoplanet group at the Geneva Observatory with the radial velocity method using the CORALIE spectrograph on the Swiss 1.2-metre Leonard Euler Telescope.[2] At the time it was one of the lowest mass planets that had been discovered.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (Onasilus) | >0.23 MJ | 0.065 | 6.403 ± 0.001 | 0.081 ± 0.029 | — | — |
See also
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.
- Pepe, F.; et al. (2002). "The CORALIE survey for southern extra-solar planets VII. Two short-period Saturnian companions to HD 108147 and HD 168746". Astronomy and Astrophysics. 388 (2): 632–638. arXiv:astro-ph/0202457. Bibcode:2002A&A...388..632P. doi:10.1051/0004-6361:20020433. S2CID 13942987.
- "HD 168746". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-05.
- "Exoplanets Galore!" (Press release). Garching, Germany: European Southern Observatory. April 15, 2000. Retrieved December 30, 2012.
External links
 | This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it. |
На других языках
[de] HD 168746
HD 168746 ist ein etwa 140 Lichtjahre von der Erde entfernter Hauptreihenstern der Spektralklasse G5, der an der Grenze zwischen den Sternbildern Serpens Cauda und Scutum liegt. Er besitzt eine scheinbare Helligkeit von 7,95 mag. Der Stern wird von einem Exoplaneten mit der Bezeichnung HD 168746 b umrundet.- [en] HD 168746
[es] HD 168746
HD 168746 (HIP 90004 / SAO 161386 / BD-11 4606)[1] es una estrella en la constelación de Serpens de magnitud aparente +7,95, situada en el límite de Serpens Cauda (la cola de la serpiente) con Scutum. Al ser tan tenue no es visible a simple vista, pero sí con binoculares o con pequeños telescopios. En 2002 se anunció el descubrimiento de un planeta extrasolar en órbita alrededor de esta estrella.[2][ru] HD 168746
HD 168746 — жёлтый карлик (спектральный класс G5), расположенный на расстоянии в 140 световых лет от Земли в созвездии Змеи. Звезда очень похожа по своим характеристикам на Солнце. Вокруг звезды обращается планета HD 168746b.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
WikiSort.org - проект по пересортировке и дополнению контента Википедии