Mu2 Octantis

HD 196067
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Octans
Right ascension 20h 41m 44.088s[1]
Declination –75° 21 02.87[1]
Apparent magnitude (V) +6.51
Characteristics
Spectral type G0V
Astrometry
Proper motion (μ) RA: 149.53 ± 2.28[1] mas/yr
Dec.: –158.45 ± 2.47[1] mas/yr
Parallax (π)22.59 ± 2.62[1] mas
Distanceapprox. 140 ly
(approx. 44 pc)
Details
Mass1.29 ± 0.08 M
Radius1.73 ± 0.21 R
Luminosity3.73 L
Surface gravity (log g)4.38 ± 0.08 cgs
Temperature6017 ± 46 K
Metallicity [Fe/H]0.18 ± 0.04 dex
Age3.3 ± 0.6 Gyr
Other designations
Mu2 Octantis A, HIP 102125, CCDM J20417-7521A, LTT 8159
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

Mu2 Octantis2 Oct) is a binary system of two G-class yellow dwarf stars. It shares the μ with μ1 Oct, from which it is separated by 50 arcminutes.

The A star is HD 196067, noted in the starbox here. The B star is HD 196068 (HIP 102128, LTT 8160),[2] "a G1 dwarf with an apparent magnitude V=7.18", temperature 5768 K, and mass 1.18 ± 0.07. The two are gravitationally bound and separated at 17 arcseconds in our sky, corresponding to 740 AU. The binary semimajor axis is 932 AU.[3]

The metallicity of this system, data correlated to the presence of planets, is higher than solar ([Fe / H] ≈ +0.2).

Planetary system

From 1998 to 2012, the system was under observance from "the CORALIE echelle spectrograph at La Silla Observatory".

In 2012, a long-period, wide-orbiting planet was deduced by radial velocity around HD 196067. This was published in November. The planet has been pulled to an eccentric orbit by the B star HD 196068.

The HD 196067 planetary system[4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >6.9+3.9
1.1
 MJ
5.02 ± 0.19 3638+232
185
0.66+0.18
0.09

References

  1. 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
  2. "LTT 8160 (SIMBAD)".
  3. Marmier, M.; et al. (2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics 551. A90. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639.
  4. "hd_196067_b".
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