| 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 |
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]
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) | — | — |
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