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HD 73256 is a variable star in the southern constellation of Pyxis. It has the variable star designation CS Pyxidis. With a baseline apparent visual magnitude of 8.08,[2] it requires a small telescope to view. The star is located at a distance of 120 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +30 km/s.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 08h 36m 23.01633s[1] |
| Declination | −30° 02′ 15.4419″[1] |
| Apparent magnitude (V) | 8.08[2] |
| Characteristics | |
| Spectral type | G8 IV-V Fe+0.5[3] |
| B−V color index | 0.782±0.002[2] |
| Variable type | BY Dra[4] |
| Astrometry | |
| Radial velocity (Rv) | +29.77±0.22[2] km/s |
| Proper motion (μ) | RA: −182.015[1] mas/yr Dec.: +67.080[1] mas/yr |
| Parallax (π) | 27.2131 ± 0.0413 mas[1] |
| Distance | 119.9 ± 0.2 ly (36.75 ± 0.06 pc) |
| Absolute magnitude (MV) | 5.20[2] |
| Details[5] | |
| Mass | 1.01±0.03 M☉ |
| Radius | 0.94±0.02 R☉ |
| Luminosity | 0.74±0.01 L☉ |
| Surface gravity (log g) | 4.49±0.03 cgs |
| Temperature | 5,532±36 K |
| Metallicity [Fe/H] | 0.29±0.05[6] dex |
| Rotational velocity (v sin i) | 3.22±0.32[6] km/s |
| Age | 2.5±2.3 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of this star is G8IV-VFe+0.5, which suggests a slightly evolved G-type main-sequence star with a mild overabundance of iron in the spectrum. It is a BY Draconis variable with a period of 13.97 days, showing a variation of 0.03 in magnitude due to chromospheric activity.[4] The star appears overluminous for its class, which may be the result of a high metallicity.[6] The star has roughly the same mass and a slightly smaller radius as the Sun, but is radiating 74% of the Sun's luminosity.[5] It is around 2–3 billion years old and is spinning with a projected rotational velocity of 3.2 km/s.[6]
In 2003, S. Udry and colleagues reported the discovery of a planet in orbit around HD 73256 using data from the CORALIE spectrograph. This object is a Hot Jupiter with at least 1.87 times the mass of Jupiter in an orbit with a period of 2.55 days.[6] In 2018, K. Ment and colleagues reported an attempt to confirm the existence of this planet using Keck/HIRES data, but were unable to do so. Thus the existence of this object is disputed.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >1.87 ± 0.49 MJ | 0.037 | 2.54858 ± 0.00016 | 0.029 ± 0.02 | — | — |
See also
- HD 72659
- List of extrasolar planets
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.
- Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
- Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
- Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
- Udry, S.; et al. (2003). "The CORALIE survey for southern extra-solar planets X. A Hot Jupiter orbiting HD 73256". Astronomy and Astrophysics. 407 (2): 679–684. arXiv:astro-ph/0304248. Bibcode:2003A&A...407..679U. doi:10.1051/0004-6361:20030815. S2CID 118889984.
- "HD 73256". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-28.
- Ment, Kristo; et al. (November 2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5): 45. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5. S2CID 119243619. 213.
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На других языках
[de] HD 73256
HD 73256 ist ein 120 Lichtjahre von der Erde entfernter Gelber Zwerg im Sternbild Pyxis. Er besitzt eine scheinbare Helligkeit von 8,1 mag. Im Jahre 2003 entdeckte Stéphane Udry einen extrasolaren Planeten, der diesen Stern umkreist. Dieser trägt die Bezeichnung HD 73256 b.- [en] HD 73256
[es] HD 73256
HD 73256 (HIP 42214 / SAO 176159)[1] es una estrella en la constelación de la Brújula situada visualmente a menos de 1º de ζ Pyxidis. Tiene magnitud aparente media +8,08, por lo que no es observable a simple vista. En 2003 se anunció el descubrimiento de un planeta extrasolar orbitando alrededor de esta estrella.[2]Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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