HD 125612
HD 125612 is a yellow main sequence star located approximately 188 light years away in the constellation Virgo. It is rich in heavy elements and has three known planets in orbit around it.[2][4] A red dwarf companion star was detected in 2009 at a projected separation of 4750 AU. The possibility of a much closer companion to the primary star was also suggested, though this will need more observation to better define.[3]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 20m 53.5177s[1] |
| Declination | −17° 28′ 53.4888″[1] |
| Apparent magnitude (V) | 8.31[2] / ? |
| Characteristics | |
| Spectral type | G3V[2] / M3- 4V[3] |
| Apparent magnitude (B) | 8.92 |
| Apparent magnitude (J) | 7.179 |
| Apparent magnitude (H) | 6.950 |
| Apparent magnitude (K) | 6.838 |
| B−V color index | 0.59 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | −18.4 km/s |
| Proper motion (μ) | RA: −60.258±0.094[1] mas/yr Dec.: −67.373±0.082[1] mas/yr |
| Parallax (π) | 17.3261 ± 0.0490[1] mas |
| Distance | 188.2 ± 0.5 ly (57.7 ± 0.2 pc) |
| Absolute magnitude (MV) | 4.72 |
| Position (relative to HD 125612 A)[3] | |
| Component | HD 125612 B |
| Angular distance | 89.994 ± 0.066″ |
| Position angle | 162.682 ± 0.052° |
| Observed separation (projected) | ~4750 AU |
| Details | |
| Mass | 1.091 ± 0.027[2] M☉ |
| Radius | 1.05 ± 0.08[2] R☉ |
| Luminosity | 1.09[2] L☉ |
| Surface gravity (log g) | 4.41 ± 0.05[2] cgs |
| Temperature | 5900 ± 18[2] K |
| Metallicity | [Fe/H] = 0.23 ± 0.014[2] |
| Age | <3[2] Gyr |
| HD 125612 B | |
| Mass | 0.184 ± 0.012[3] M☉ |
| Age | 1-5[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
Planetary System
_HD_125612_Star_system.png)
Diagram of the probable HD 125612 Star system.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | ≥0.055±0.01 MJ | 0.0524±0.0031 | 4.15514±0.00026 | 0.049±0.038 | — | — |
| b | ≥3.1±0.4 MJ | 1.372±0.083 | 557.04±0.35 | 0.4553±0.0055 | — | — |
| d | ≥7.28±0.93 MJ | 4.06±0.25 | 2835.0±7.9 | 0.1172±0.0056 | — | — |
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.
- Lo Curto, G.; et al. (2015). "The HARPS search for southern extra-solar planets. XXII. Multiple planet systems from the HARPS volume limited sample". Astronomy and Astrophysics. 512. A48. arXiv:1411.7048. Bibcode:2010A&A...512A..48L. doi:10.1051/0004-6361/200913523.
- Mugrauer, M.; Neuhäuser, R. (2009). "The multiplicity of exoplanet host stars New low-mass stellar companions of the exoplanet host stars HD 125612 and HD 212301". Astronomy and Astrophysics. 494 (1): 373–378. arXiv:0812.2561. Bibcode:2009A&A...494..373M. doi:10.1051/0004-6361:200810639.
- Fischer, Debra A.; et al. (2007). "Five Intermediate-Period Planets from the N2K Sample". The Astrophysical Journal. 669 (2): 1336–1344. arXiv:0704.1191. Bibcode:2007ApJ...669.1336F. doi:10.1086/521869.
- Ment, Kristo; et al. (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). 213. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5.
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