HD 128311

Coordinates: Sky map 14h 36m 00.5607s, +09° 44′ 47.466″
Source: Wikipedia, the free encyclopedia.
HD 128311

A near infrared (Y band) light curve for HN Boötes, adapted from Strassmeier et al. (2000)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation
Boötes
Right ascension 14h 36m 00.56073s[2]
Declination +09° 44′ 47.4536″[2]
Apparent magnitude (V) 7.48[3]
Characteristics
Spectral type K3V[4]
B−V color index 0.973±0.004[3]
Variable type BY Dra[5]
Distance
53.28 ± 0.06 ly
(16.34 ± 0.02 pc)
Absolute magnitude (MV)6.39[3]
Details
Gyr
LTT 14312, GSC 00910-00165[9]
Database references
SIMBADdata
ARICNSdata

HD 128311 is a

extrasolar planets have been detected in orbit around this star.[8]

The

luminosity of the Sun from its photosphere at an effective temperature of 4,863 K.[6]

Planetary system

The HD 128311 planetary system[10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
d (unconfirmed) ≥0.133±0.005 MJ 0.092±0.004 11.2210±0.0008 0.196±0.030 — —
b ≥1.769±0.023 MJ 1.084±0.006 453.019±0.404 0.303±0.011 >30° —
c 3.789+0.924
−0.432 MJ 		1.740±0.010 921.538±1.15 0.159±0.006 55.950±14.553° —

In 2002, the discovery of the exoplanet HD 128311 b was announced by Paul Butler.[11] In 2005, the discovery of a second exoplanet HD 128311 c was announced by Steve Vogt.[8]

Most likely, the system has been formed in a very turbulent disc.[7] The authors were able to show with both analytic and numerical models that certain libration modes are readily excited by turbulence. It was initially thought that the system could have been resulted from planet–planet scattering, but this is rather unlikely.

In 2014, the true mass of HD 128311 c was measured via astrometry. The same study also proposed a third planetary candidate, but it has not been confirmed.[10]

Time evolution of orbital elements in the system HD128311. This left panel in this plot shows the most likely formation scenario for the planetary system. The right panel shows the observed orbital configuration.
Time evolution of orbital elements in the system HD128311. This left panel in this plot shows the most likely formation scenario for the planetary system. The right panel shows the observed orbital configuration.

See also

  • List of extrasolar planets

References

  1. doi:10.1051/aas:2000328
    .
  2. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  3. ^
    S2CID 119257644
    .
  4. ^
    doi:10.1111/j.1365-2966.2009.16182.x
    .
  5. ^
    S2CID 125853869
    .
  6. ^
    S2CID 119511744
    . 21.
  7. ^
    S2CID 12286814
    .
  8. ^
    S2CID 16509245
    .
  9. ^ "HD 128311". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-04-06.
  10. ^
    S2CID 122980723
    .
  11. S2CID 17608922
    .

External links

External links

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