HD 212301 is a binary star[4] system in the south circumpolar constellation of Octans. This star is also called HIP 110852.[7] With an apparent visual magnitude of 7.76,[2] it is too faint to be visible to the naked eye. The system is located at a distance of 177 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +4.7 km/s.[2] It has an absolute magnitude of 4.06.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Octans |
| Right ascension | 22h 27m 30.92159s[1] |
| Declination | −77° 43′ 04.5298″[1] |
| Apparent magnitude (V) | 7.76[2] |
| Characteristics | |
| Spectral type | F8V[3] + M3V[4] |
| B−V color index | 0.560±0.010[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.69±0.01[2] km/s |
| Proper motion (μ) | RA: 76.862±0.051[1] mas/yr Dec.: −92.203±0.055[1] mas/yr |
| Parallax (π) | 18.4109 ± 0.0290 mas[1] |
| Distance | 177.2 ± 0.3 ly (54.32 ± 0.09 pc) |
| Absolute magnitude (MV) | 4.06[2] |
| Details | |
| A | |
| Mass | 1.20[5] M☉ |
| Radius | 1.23+0.04 −0.02[1] R☉ |
| Luminosity | 1.911±0.005[1] L☉ |
| Surface gravity (log g) | 4.35[5] cgs |
| Temperature | 6169±37[5] K |
| Metallicity [Fe/H] | 0.13±0.02[2] dex |
| Rotational velocity (v sin i) | 5.44[6] km/s |
| Age | 4.2+1.1 −1.4[2] Gyr |
| B | |
| Mass | 0.35±0.02[4] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
The primary, component A, is an F-type main-sequence star with a stellar classification of F8V.[3] It has 20%[5] greater mass than the Sun and a 23%[1] larger radius. Its age is about the same as the Sun and it is spinning with a projected rotational velocity of 5.4 km/s.[6] It is a metal-rich star with 50% more metals than the Sun has.[6] The star is radiating 1.9[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,169 K.[1]
A secondary companion was announced in 2009. This faint star is located at an angular separation of 4.4″ to the northwest of the primary, corresponding to a projected separation of ~230 AU. This is a red dwarf with an estimated class of M3V and a mass equal to around 35% of the mass of the Sun. The pair share a common proper motion.[4]
A hot jupiter candidate exoplanet was discovered orbiting the primary, based on radial velocity observations taken in 2003 and 2005.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.45 MJ | 0.036 | 2.245715±0.000028 | 0.0 (fixed) | — | — |
See also
editReferences
edit- ^ a b c d e f g h i j k Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g h i Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
- ^ a b c d Mugrauer, M.; Neuhäuser, R. (January 2009). "The multiplicity of exoplanet host stars. New low-mass stellar companions of the exoplanet host stars HD 125612 and HD 212301". Astronomy and Astrophysics. 494 (1): 373–378. arXiv:0812.2561. Bibcode:2009A&A...494..373M. doi:10.1051/0004-6361:200810639. S2CID 15018915.
- ^ a b c d Luck, R. Earle (March 2018). "Abundances in the Local Region. III. Southern F, G, and K Dwarfs". The Astronomical Journal. 155 (3): 31. Bibcode:2018AJ....155..111L. doi:10.3847/1538-3881/aaa9b5. S2CID 125765376. 111.
- ^ a b c d e Lo Curto, G.; et al. (2006). "The HARPS search for southern extra-solar planets VII. A very hot Jupiter orbiting HD 212301" (PDF). Astronomy & Astrophysics. 451 (1): 345–350. Bibcode:2006A&A...451..345L. doi:10.1051/0004-6361:20054083.
- ^ a b "HD 212301". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-27.
External links
edit- "Notes for star HD 212301". Extrasolar Planets Encyclopaedia. Archived from the original on June 13, 2007. Retrieved 2008-08-29.