| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo[1] |
| Right ascension | 11h 45m 42.29278s[2] |
| Declination | +02° 49′ 17.3262″[2] |
| Apparent magnitude (V) | 8.07[3] |
| Characteristics | |
| Spectral type | K0 V[4] |
| B−Vcolor index | 0.835[3] |
| Astrometry | |
| Radial velocity (Rv) | 1.85±0.15[2] km/s |
| Proper motion (μ) | RA: −188.735[2]mas/yr Dec.: −113.403[2]mas/yr |
| Parallax (π) | 34.0560±0.0555 mas[2] |
| Distance | 95.8 ± 0.2 ly (29.36 ± 0.05 pc) |
| Absolute magnitude (MV) | 5.76[3] |
| Details[5] | |
| Mass | 0.88±0.03 M☉ |
| Radius | 0.84±0.02 R☉ |
| Luminosity | 0.49±0.01 L☉ |
| Surface gravity (log g) | 4.53±0.03 cgs |
| Temperature | 5,283±29 K |
| Metallicity[Fe/H] | +0.09[6] dex |
| Rotation | 12.3 d[7] |
| Rotational velocity (v sin i) | 2.6[3] km/s |
| Age | 5.9±3.5 Gyr |
| Other designations | |
| BD+03°2549,HD 102195,HIP 57370,HR 4293,SAO 119033,LTT 13232,NLTT 28458[8] | |
| Database references | |
| SIMBAD | data |
HD 102195 is an orange-huedstar in thezodiacconstellation ofVirgo with a confirmedexoplanet companion.[3] With anapparent visual magnitude of 8.07,[3] the star is too faint to be seen with the naked eye. The distance to HD 102195 can be estimated from its annualparallax shift of34.06 mas,[2] yielding 95.8 light years. It is moving further away from the Earth with a heliocentricradial velocity of 1.85 km/s.[2] This is a highproper motion star and a possible member of theη Chastellar kinematic group.[9]
The star HD 102195 is namedFlegetonte. The name was selected in theNameExoWorlds campaign byItaly, during the 100th anniversary of theIAU. Flegetonte is the underworld river of fire fromGreek Mythology in the Italian narrative poem on the afterlifeDivina Commedia.[10][11]
ThisK-type main-sequence star has astellar classification of K0 V.[4] It is a quasi-periodicvariable star with a cycle of 11.5 days, a variation range of 3.65%, and a phasedamplitude of 94%.[12] HD 102195 is around six billion years old with a rotation period of 12.3 days.[7] It has 88% of theSun's mass and 84% of theSun's radius. It is radiating 49% of theSun's luminosity from itsphotosphere at aneffective temperature of 5,283 K.[5]
In 2005, an orbiting companion was detected using theExoplanet Tracker instrument.[13] This nearJupiter-mass exoplanet has an orbital period of 4.1 days with a circular orbit. By comparing the rotation period and radius of the star with theprojected rotational velocity, Melo et al. (2007) derived anorbital inclination of 47°. This would suggest a planetary mass of0.62 MJ.[3]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Lete | ≥0.45 MJ | 0.0491[13] | 4.113775±0.000557 | 0.0 (assumed) | — | — |
