Mu2 Octantis

Mu2 Octantis (μ2 Oct) is a binary star system of two G-type main-sequence stars. It shares the designation μ with μ1 Octantis, from which it is separated by 50 arcminutes.

For other stars with this Bayer designation, see μ 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[2]
Characteristics
Spectral type G1V[3]
U−B color index +0.26[4]
B−V color index +0.62[4]
Astrometry
Radial velocity (Rv)-10.90 ± 0.2[5] km/s
Proper motion (μ) RA: 149.53 ± 2.28[1] mas/yr
Dec.: –158.45 ± 2.47[1] mas/yr
Parallax (π)25.0327 ± 0.0205 mas[6]
Distance130.3 ± 0.1 ly
(39.95 ± 0.03 pc)
Absolute magnitude (MV)3.28[3]
Details[3]
Mass1.29 ± 0.08 M☉
Radius1.73 ± 0.21 R☉
Luminosity3.73 L☉
Surface gravity (log g)4.24 ± 0.03 cgs
Temperature6017 ± 46 K
Metallicity [Fe/H]0.18 ± 0.04 dex
Rotation26 ± 3
Rotational velocity (v sin i)1.45 km/s
Age3.3 ± 0.6 Gyr
Other designations
μ2 Oct A, CD−75° 1173, HD 196067, HIP 102125, HR 7864, SAO 257836, CCDM J20417-7521A, 2MASS J20414409-7521029
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

The primary star (A) is HD 196067, whose data is in the starbox. The secondary star (B) is HD 196068 (HIP 102128, LTT 8160),[7] another G-type main-sequence star with an apparent magnitude of 7.18.[3] Its effective temperature 5997 K, and its mass is 1.18 ± 0.07 M☉.[3] The two are gravitationally bound and separated at 17 arcseconds in our sky, corresponding to 740 astronomical units (AU). The binary semimajor axis is 932 AU.[3]

Planetary system

From 1998 to 2012, the system was observed using the CORALIE instrument, at the ESO's La Silla Observatory.[3]

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 planet's mass is 12.5 MJ, placing it right on the boundary between planets and brown dwarfs.[8]

The HD 196067 planetary system[8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b 12.5+2.5
−1.8 MJ		 5.10+0.22
−0.17		 9.88+0.63
−0.43		 0.70+0.14
−0.12		 — —

References
  1. 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. S2CID 18759600.Vizier catalog entry
  2. "* mu.02 Oct". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 August 2017.
  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. S2CID 59467665.
  4. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  6. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  7. "HD 196068". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 August 2017.
  8. Li, Yiting; Brandt, Timothy D.; Brandt, G. Mirek; Dupuy, Trent J.; Michalik, Daniel; Jensen-Clem, Rebecca; Zeng, Yunlin; Faherty, Jacqueline; Mitra, Elena L. (2021). "Precise Masses and Orbits for Nine Radial-velocity Exoplanets". The Astronomical Journal. 162 (6): 266. arXiv:2109.10422. Bibcode:2021AJ....162..266L. doi:10.3847/1538-3881/ac27ab. S2CID 237592581.
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