HD 173416
Coordinates: 
18h 43m 36.110s, +36° 33′ 23.78″
18h 43m 36.110s, +36° 33′ 23.78″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra[1]
|
| Right ascension | 18h 43m 36.109s[2] |
| Declination | +36° 33′ 23.78″[2] |
| Apparent magnitude (V) | 6.04[1] |
| Characteristics | |
| Evolutionary stage | Giant[3] |
| Spectral type | G8 III[4] |
| Apparent magnitude (B) | 7.080[1] |
| Apparent magnitude (J) | 4.580±0.264[1] |
| Apparent magnitude (H) | 3.929±0.232[1] |
| Apparent magnitude (K) | 3.814±0.354[1] |
| B−V color index | 1.040±0.006[1] |
| Absolute magnitude (MV) | 0.406[3] |
| Details | |
Gyr | |
| Database references | |
Exoplanet Archive | data |
HD 173416, also named Xihe, is a
apparent visual magnitude of 6.04.[1]
This indicates the star is dimly visible to the naked eye.
The
G-type giant star with a stellar classification of G8 III.[4] This means it has consumed the hydrogen at its stellar core and evolved off the main sequence. At an age of around two billion years, it has expanded to 13 times the radius of the Sun. The star has 1.8 times the mass of the Sun and is radiating 79 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,790 K.[6] Based on the abundance of iron in the stellar atmosphere, it has a sub-solar metallicity.[3]
The star HD 173416 is named Xihe (羲和). The name was selected in the NameExoWorlds campaign by Nanjing, during the 100th anniversary of the IAU. Xihe is the goddess of the sun in the Chinese mythology and also represents the earliest astronomers and developers of calendars in ancient China. The exoplanet is named Wangshu (望舒) after the goddess who drives the Moon across the sky in Chinese mythology.[8][9]
Planetary system
In January 2009, an exoplanet of the star was discovered. This object was detected using the
radial velocity method by search programs conducted from the Xinglong Station in China and the Okayama Astrophysical Observatory (OAO) in Japan. As the inclination of the orbital plane is unknown, only a lower bound on the mass can be determined. The mass of this object is at least 2.7 times the mass of Jupiter.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.7[3] MJ | 1.16[3] | 324[3] | 0.21[3] | — | — |
See also
- List of extrasolar planets
References
- ^ S2CID 119257644.
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 250679097.
- ^ S2CID 237369556.
- ^ S2CID 52952408.
- ^ S2CID 53971692. A5.
- ^ "HD 173416". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-30.
- ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
- ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
External links
- "HD 173416". Exoplanets. Archived from the original on 2009-11-24. Retrieved 2009-06-10.