Mu2 Octantis
| 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 mas[1] |
| Distance | approx. 140 ly (approx. 44 pc) |
| Details | |
| Mass | 1.29 ± 0.08 M☉ |
| Radius | 1.73 ± 0.21 R☉ |
| Luminosity | 3.73 L☉ |
| Surface gravity (log g) | 4.38 ± 0.08 cgs |
| Temperature | 6017 ± 46 K |
| Metallicity [Fe/H] | 0.18 ± 0.04 dex |
| Age | 3.3 ± 0.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Mu2 Octantis (μ2 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.
| 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
- ^ a b c d e 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
- ^ "LTT 8160 (SIMBAD)".
- ^ Marmier, M.; Ségransan, D.; Udry, S.; Mayor, M.; Pepe, F.; Queloz, D.; Lovis, C.; Naef, D.; Santos, N. C.; Alonso, R.; Alves, S.; Berthet, S.; Chazelas, B.; Demory, B.-O.; Dumusque, X.; Eggenberger, A.; Figueira, P.; Gillon, M.; Hagelberg, J.; Lendl, M.; Mardling, R. A.; Mégevand, D.; Neveu, M.; Sahlmann, J.; Sosnowska, D.; Tewes, M.; Triaud, A. H. M. J. (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.
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