HD 109271
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 33m 36s |
| Declination | −11° 37′ 19″ |
| Apparent magnitude (V) | 8.05 ± 0.01 |
| Characteristics | |
| Spectral type | G5V |
| Astrometry | |
| Parallax (π) | 16.21±0.75 mas |
| Distance | 201 ly (62 ± 3 pc) |
| Details | |
| Mass | 1.047 ± 0.024 M☉ |
| Radius | ? R☉ |
| Luminosity | 2.0 ± 0.3 L☉ |
| Surface gravity (log g) | 4.28 ± 0.10 cgs |
| Temperature | 5783 ± 62 K |
| Metallicity | 0.10 ± 0.05 |
| Age | 7.3±1.2 × 109 years |
| Other designations | |
HIP 61300, LTT 4770 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 109271 is an old yellow main-sequence dwarf star.
Planetary system
From 2003 to 2012, the star was under observance from HARPS.
In 2012, two eccentric hot Neptune-mass planets were deduced by radial velocity. They were published in January 2013. These are close to a 1:4 resonance. The system is like HD 69830.
A third Neptune in the Venus zone was hypothesised from the data.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.054 ± 0.004 MJ | 0.079 ± 0.001 | 7.8543 ± 0.0009 | 0.25 ± 0.08 | — | — |
| c | >0.076 ± 0.007 MJ | 0.196 ± 0.003 | 30.93 ± 0.02 | 0.15 ± 0.09 | — | — |
| d (unconfirmed) | >1.3 neptune MJ | 1 | 430 | 0.36 | — | — |
References
- ↑ "hd_109271_b".
- ↑ G. Lo Curto; et al. (2013). "The HARPS search for southern extrasolar planets: XXXVI. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone". arXiv:1301.2741. Bibcode:2013arXiv1301.2741L.
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