astro.wikisort.org - StarHD 70642 is a star with an exoplanetary companion in the southern constellation of Puppis. It has an apparent visual magnitude of +7.17,[2] which is too dim to be readily visible to the naked eye. The system is located at a distance of 95.6 light-years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +49.4 km/s.[1] It came to within 55.3 ly of the Solar System some 329,000 years ago.[2]
Yellow dwarf star in the constellation Puppis
HD 70642
Observation data
Epoch J2000.0 Equinox J2000.0 |
| Constellation |
Puppis |
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| Right ascension |
8h 21m 28.1372s[1] |
| Declination |
−39° 42′ 19.4800″[1] |
| Apparent magnitude (V) |
+7.17[2] |
| Characteristics |
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| Spectral type |
G6V CN+0.5[3] |
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| B−V color index |
0.692±0.022[2] |
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| Astrometry |
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| Radial velocity (Rv) | +49.40±0.13[1] km/s |
| Proper motion (μ) | RA: −201.989±0.052[1] mas/yr
Dec.: 224.817±0.051[1] mas/yr |
| Parallax (π) | 34.1287 ± 0.0319 mas[1] |
| Distance | 95.57 ± 0.09 ly
(29.30 ± 0.03 pc) |
| Absolute magnitude (MV) | +4.93[2] |
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| Details |
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| Mass | 1.04±0.02[4] M☉ |
| Radius | 0.97±0.01[4] R☉ |
| Luminosity | 0.917±0.004[4] L☉ |
| Surface gravity (log g) | 4.47±0.02[4] cgs |
| Temperature | 5732±23[4] K |
| Metallicity [Fe/H] | +0.17±0.04[5] dex |
| Rotational velocity (v sin i) | 1.57[6] km/s |
| Age | 1.9±1.1 Gyr[4]
3.8±2.6[6] Gyr |
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| Other designations |
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CD−39°4247, GJ 304, HD 70642, HIP 40952, SAO 199126, LTT 3116 [7] |
| Database references |
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| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
Extrasolar Planets
Encyclopaedia | data |
This may be considered to be a solar analog star, being similar in physical properties to the Sun.[5] It is a G-type main-sequence star with a stellar classification of G6V CN+0.5.[3] It is comparable to the age of the Sun, estimated to be in the range of 2–6 billion years old. Although chromospherically inactive a magnetic field has been detected.[5] This star has about the same mass and radius as the Sun, is slightly cooler and less luminous,[4] and is richer in abundance of iron relative to hydrogen.[5] It is spinning at a leisurely rate, showing a projected rotational velocity of 1.6 km/s.[6]
Planetary system
A long period planet companion to HD 70642 was announced in 2003. This planet orbits in a circular orbit (e=0.034) at 3.232 AU.[8] The star is so like Sol that its habitable zone is in the same place (~ 1 AU). The jovian ensures the stability of an Earth-mass planet at 1 AU. This system is one of the most similar in conditions to the Solar System than any other currently known planetary systems.[9]
The HD 70642 planetary system[10]
Companion
(in order from star) |
Mass |
Semimajor axis
(AU) |
Orbital period
(days) |
Eccentricity |
Inclination |
Radius |
| b |
≥1.75±0.09 MJ |
3.263±0.010 |
2148.7±9.8 |
0.186±0.051 |
— |
— |
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.
- 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.
{{cite journal}}: CS1 maint: postscript (link) - 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.
- 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.
- Fossati, L.; et al. (March 2013). "Detection of a magnetic field in three old and inactive solar-like planet-hosting stars". Astronomy & Astrophysics. 551: 4. arXiv:1302.0879. Bibcode:2013A&A...551A..85F. doi:10.1051/0004-6361/201220997. A85.
- Costa Silva, A. R.; et al. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur". Astronomy & Astrophysics. 634: 10. arXiv:1912.08659. Bibcode:2020A&A...634A.136C. doi:10.1051/0004-6361/201936523. A136.
- "HD 70642". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-09-04.
- Carter, Brad D.; et al. (2003). "A Planet in a Circular Orbit with a 6 Year Period". The Astrophysical Journal Letters. 593 (1): L43–L46. arXiv:astro-ph/0307066. Bibcode:2003ApJ...593L..43C. doi:10.1086/378185.
- Hinse, T. C.; et al. (2008). "Dynamics and stability of telluric planets within the habitable zone of extrasolar planetary systems - Numerical simulations of test particles within the HD 4208 and HD 70642 systems". Astronomy & Astrophysics. 488 (3): 1133–1147. Bibcode:2008A&A...488.1133H. doi:10.1051/0004-6361:200809822.
- Wittenmyer, Robert A.; et al. (2020). "Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search". Monthly Notices of the Royal Astronomical Society. 492 (1): 377–383. arXiv:1912.01821. Bibcode:2020MNRAS.492..377W. doi:10.1093/mnras/stz3436. S2CID 208617606.
External links
На других языках
[de] HD 70642
HD 70642 ist ein 94,6 Lichtjahre von der Erde entfernter Gelber Zwerg mit einer Rektaszension von 08h 21m 28s und einer Deklination von −39° 42' 19". Er besitzt eine scheinbare Helligkeit von 7,18 mag. Im Jahre 2003 entdeckte Brad D. Carter einen extrasolaren Planeten, der diesen Stern umkreist. Dieser trägt den Namen HD 70642 b.
- [en] HD 70642
[es] HD 70642
HD 70642 (GJ 304) es una estrella de magnitud aparente +7,18[1] en la constelación de Puppis, situada el este de Naos (ζ Puppis), norte de Gamma Velorum y noroeste de Suhail (λ Velorum).[2] En 2003 se anunció el descubrimiento de un planeta joviano en órbita alrededor de esta estrella.
[ru] HD 70642
HD 70642 — звезда, которая находится в созвездии Корма на расстоянии около 94 световых лет от нас.
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