HD 70642
HD 70642 is a yellow dwarf star in the constellation of Puppis located 92 light years away.[1] This star has about the same mass and radius as the Sun, is slightly cooler and less luminous, and is richer in abundance of iron relative to hydrogen.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Puppis |
| Right ascension | 8h 21m 28.137s[1] |
| Declination | –39° 42′ 19.48″[1] |
| Apparent magnitude (V) | +7.18 |
| Characteristics | |
| Spectral type | G5V |
| U−B color index | 0.28 |
| B−V color index | 0.70 |
| V−R color index | 0.35 |
| R−I color index | 0.32 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | +48.1 km/s |
| Proper motion (μ) | RA: –201.65 ± 0.31[1] mas/yr Dec.: 225.18 ± 0.42[1] mas/yr |
| Parallax (π) | 35.63 ± 0.44[1] mas |
| Distance | 92 ± 1 ly (28.1 ± 0.3 pc) |
| Absolute magnitude (MV) | +4.89 |
| Details | |
| Mass | 1.04±0.02[2] M☉ |
| Radius | 0.97±0.01[2] R☉ |
| Luminosity | 0.917±0.004[2] L☉ |
| Surface gravity (log g) | 4.47±0.02[2] cgs |
| Temperature | 5732±23[2] K |
| Metallicity [Fe/H] | 0.16±0.02 dex |
| Age | 1.9±1.1[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia | data |
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.[3] 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.[4] This system is one of the most similar in conditions to the Solar System than any other currently known planetary systems.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.97 ± 0.18 MJ | 3.23 ± 0.19 | 2068 ± 39 | 0.034 ± 0.043 | — | — |
See also
- Gliese 777
- HD 28185
- Pi Mensae
- HIP 11915
- List of extrasolar planets
References
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry Archived 2016-03-04 at the Wayback Machine
- 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.
- 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.; MICHELSON R.; JOERGENSEN U.; GOZDIEWSKI K.; MIKKOLA S. (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.
- Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.
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