HD 109271

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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[edit]

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.

The HD 109271 planetary system[1][2]
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[edit]

  1. ^ "hd_109271_b". 
  2. ^ 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.