HD 85512
| Observation data Epoch 2000 Equinox 2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 09h 51m 07.1s[1] |
| Declination | −43° 30′ 10″[1] |
| Apparent magnitude (V) | 7.66 |
| Characteristics | |
| Spectral type | K5V |
| U−B color index | 1.12 |
| B−V color index | 1.18 |
| V−R color index | 0.71 |
| Astrometry | |
| Radial velocity (Rv) | -9.6 km/s |
| Proper motion (μ) | RA: 461.92 ± 0.52[1] mas/yr Dec.: −471.92 ± 0.51[1] mas/yr |
| Parallax (π) | 89.62 ± 0.67[1] mas |
| Distance | 36.4 ± 0.3 ly (11.16 ± 0.08 pc) |
| Absolute magnitude (MV) | 7.43 |
| Details | |
| Mass | 0.69 M☉ |
| Radius | 0.533 ± 0.04[note 1] R☉ |
| Luminosity (bolometric) | 0.126 ± 0.008 L☉ |
| Surface gravity (log g) | 4.39 ± 0.28 cgs |
| Temperature | 4715 ± 102 K |
| Metallicity | 44–50% |
| Rotation | 47.13 ± 6.98 |
| Rotational velocity (v sin i) | <3 km/s |
| Age | 5.61 ± 0.61 Gyr |
| Other designations | |
HD 85512 is a solitary K-type main-sequence star located approximately 36 light-years away in the constellation Vela. It is approximately one billion years older than the Sun. It is extremely chromospherically inactive, only slightly more active than Tau Ceti. The star is known to host one low-mass planet.
Planetary system
On August 19, 2011, a ≥3.6 Earth-mass planet was discovered using HARPS that is "just inside" the habitable zone, along with the planets of 82 G. Eridani and HR 7722 c.[3] The planet could be potentially cool enough to host liquid water if the planet exhibits more than 50% cloud coverage. HD 85512 b is currently the fifth best candidate for habitability according to the Habitable Exoplanets Catalog.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥3.6 M⊕ | 0.26 ± 0.005 | 58.43 ± 0.13 | 0.11 ± 0.1 | — | — |
References
- 1 2 3 4 5 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 - ↑ "Fifty New Exoplanets Discovered by HARPS". ESO Science Release. 12 September 2011. Retrieved 13 September 2011.
- 1 2 Pepe, F.; et al. (2011). "The HARPS search for Earth-like planets in the habitable zone. I. Very low-mass planets around HD 20794, HD 85512, and HD 192310". Astronomy and Astrophysics. 534. A58. arXiv:1108.3447. Bibcode:2011A&A...534A..58P. doi:10.1051/0004-6361/201117055.
Notes
- ↑ From , where is the radius, is the luminosity, is the effective surface temperature and is the Stefan–Boltzmann constant.
External links
Coordinates: 
09h 51m 07.1s, −43° 30′ 10″