| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 03h 20m 42.69389s[1] |
| Declination | −33° 43′ 48.3739″[1] |
| Apparent magnitude (V) | 9.92[2] |
| Characteristics | |
| Spectral type | K3/4 III/V[3] |
| Apparent magnitude (B) | 11.07[4] |
| Apparent magnitude (J) | 8.138±0.032[5] |
| Apparent magnitude (H) | 7.641±0.031[5] |
| Apparent magnitude (K) | 7.543±0.015[5] |
| B−Vcolor index | 1.037±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | 46.207±0.0011[1] km/s |
| Proper motion (μ) | RA: 292.467±0.035[1]mas/yr Dec.: 96.138±0.058[1]mas/yr |
| Parallax (π) | 20.9257±0.0304 mas[1] |
| Distance | 155.9 ± 0.2 ly (47.79 ± 0.07 pc) |
| Absolute magnitude (MV) | 6.61[2] |
| Details[6] | |
| Mass | 0.76±0.02 M☉ |
| Radius | 0.73±0.01 R☉ |
| Luminosity | 0.255±0.002 L☉ |
| Surface gravity (log g) | 4.59±0.02 cgs |
| Temperature | 4,811±14 K |
| Metallicity [Fe/H] | 0.04±0.1 dex |
| Age | 8.4±3.7 Gyr |
| Other designations | |
| CD−34°1218,HD 20868,HIP 15578,PPM 278952,LTT 1589,2MASS J03204266-3343484[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 20868 is astar in the southernconstellationFornax. With anapparent visual magnitude of 9.92,[2] it is much too dim to be visible to the naked eye.Parallax measurements give a distance estimate of 156 light years from the Sun. It is drifting further away with aradial velocity of +46.2 km/s,[1] having come to within about 124 ly around 312,000 years ago.[2]
This object is aK-type star with astellar classification of K3/4 III/V. Theluminosity class is poorly constrained; the star's evolutionary status appear to be eithermain sequence or agiant star.[3] It is around eight billion years old with 76% of themass of the Sun and 73% of theSun's radius. It is radiating 25.5% of theluminosity of the Sun from itsphotosphere at aneffective temperature of 4,811 K. Themetallicity of the star is near solar, meaning it has about the same abundance of iron as in the Sun. Its properties are consistent with those of a main sequence star.[6]
The star HD 20868 is namedIntan. The name was selected in theNameExoWorlds campaign byMalaysia, during the 100th anniversary of theIAU. Intan meansdiamond in theMalay language.[8][9]
In October 2008 aplanet,HD 20868 b, was discovered. This object was detected using theradial velocity method by search programs conducted using theHARPS spectrograph. The orbital solution indicates this is agiant planet in a highly elliptical orbit around the host star.[10]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Baiduri | ≥1.99±0.05 MJ | 0.947±0.012 | 380.85±0.09 | 0.75±0.002 | — | — |
