Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Crater |
Right ascension | 11h 17m 47.5531s [1] |
Declination | –23° 58′ 31.4952″ [1] |
Apparent magnitude (V) | +8.05 [2] |
Characteristics | |
Spectral type | K0III/IV [3] |
Astrometry | |
Radial velocity (Rv) | -10.30 [1] km/s |
Proper motion (μ) |
RA: −130.770±0.068
[1]
mas/
yr Dec.: −16.887±0.050 [1] mas/ yr |
Parallax (π) | 8.7662 ± 0.0489 mas [1] |
Distance | 372 ± 2
ly (114.1 ± 0.6 pc) |
Absolute magnitude (MV) | +2.6 [4] |
Details | |
Mass | 1.41 [2] M☉ |
Radius | 4.6 [2] R☉ |
Luminosity | 8.284 [1] L☉ |
Surface gravity (log g) | 3.36 [2] cgs |
Temperature | 4,925 [2] K |
Age | 4 [4] Gyr |
Database references | |
SIMBAD | data |
HD 98219, also named Hunahpú, is a subgiant star in the constellation Crater. It has a confirmed exoplanet. At around 4 billion years old, it is a star around 1.3 times as massive as the Sun that has cooled and expanded to 4.5 times the Sun's diameter, brightening to be around 11 times as luminous. [4] The International Astronomical Union ( IAU) gave the opportunity to Honduras to name the star Hunahpú as part of NameExoWorlds. Hunahpú was one of the twin gods who became the Sun in K'iche' (Quiché) Mayan mythology. [5]
A gas giant planet with a minimum mass almost double that of Jupiter was discovered as part of a radial velocity survey of subgiant stars at Keck Observatory. [4] The International Astronomical Union ( IAU) has named it Ixbalanqué, the twin brother of Hunahpú. [5]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b / Ixbalanqué | ≥1.964±0.099 MJ | 1.26±0.12 | 433.8±2.0 | 0.079±0.040 | — | — |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Crater |
Right ascension | 11h 17m 47.5531s [1] |
Declination | –23° 58′ 31.4952″ [1] |
Apparent magnitude (V) | +8.05 [2] |
Characteristics | |
Spectral type | K0III/IV [3] |
Astrometry | |
Radial velocity (Rv) | -10.30 [1] km/s |
Proper motion (μ) |
RA: −130.770±0.068
[1]
mas/
yr Dec.: −16.887±0.050 [1] mas/ yr |
Parallax (π) | 8.7662 ± 0.0489 mas [1] |
Distance | 372 ± 2
ly (114.1 ± 0.6 pc) |
Absolute magnitude (MV) | +2.6 [4] |
Details | |
Mass | 1.41 [2] M☉ |
Radius | 4.6 [2] R☉ |
Luminosity | 8.284 [1] L☉ |
Surface gravity (log g) | 3.36 [2] cgs |
Temperature | 4,925 [2] K |
Age | 4 [4] Gyr |
Database references | |
SIMBAD | data |
HD 98219, also named Hunahpú, is a subgiant star in the constellation Crater. It has a confirmed exoplanet. At around 4 billion years old, it is a star around 1.3 times as massive as the Sun that has cooled and expanded to 4.5 times the Sun's diameter, brightening to be around 11 times as luminous. [4] The International Astronomical Union ( IAU) gave the opportunity to Honduras to name the star Hunahpú as part of NameExoWorlds. Hunahpú was one of the twin gods who became the Sun in K'iche' (Quiché) Mayan mythology. [5]
A gas giant planet with a minimum mass almost double that of Jupiter was discovered as part of a radial velocity survey of subgiant stars at Keck Observatory. [4] The International Astronomical Union ( IAU) has named it Ixbalanqué, the twin brother of Hunahpú. [5]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b / Ixbalanqué | ≥1.964±0.099 MJ | 1.26±0.12 | 433.8±2.0 | 0.079±0.040 | — | — |