HD 173416
HD 173416 is an intermediate-mass giant star in the constellation Lyra. It is a 6th magnitude star, relatively bright for its distance of about 440 light years from Earth.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 43m 36.110s[1] |
| Declination | +36° 33′ 23.78″[1] |
| Apparent magnitude (V) | 6.057 |
| Characteristics | |
| Spectral type | G8[1] |
| Apparent magnitude (B) | ~7.092[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 | 1.04[2] |
| Astrometry | |
| Radial velocity (Rv) | -60.9 ± 2[1] km/s |
| Proper motion (μ) | RA: 21.54 ±0.64[1] mas/yr Dec.: 57.61 ±0.45[1] mas/yr |
| Parallax (π) | 7.41[1] ± 0.53[1] mas |
| Distance | 440 ±31.3 ly (135 ±9.6 pc) |
| Absolute magnitude (MV) | 0.406[2] |
| Details | |
| Mass | 2 ±0.3[2] M☉ |
| Radius | 13.5 ±0.9[2] R☉ |
| Luminosity | 78 ±10[2] L☉ |
| Surface gravity (log g) | 2.48 ±0.10[2] cgs |
| Temperature | 4683 ±100[2] K |
| Metallicity | −0.22 ±0.09[2] |
| Other designations | |
HIP 91852, GEN# +1.00173416, IRAS 18418+3630, TYC 2649-1153-1,
AG+36 1680, GSC 02649-01153, 2MASS J18433610+3633237, UBV M 23190, BD+36 3246, HD 173416, PPM 81707, GC 25640, HIC 91852, SAO 67292, GCRV 11177, HR 7043, SKY# 34387[1] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
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.[3][4]
Planetary system
In January 2009, a planet 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.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.7[2] MJ | 1.16[2] | 324[2] | 0.21[2] | — | — |
See also
- List of extrasolar planets
References
- "SIMBAD query result: HIP 91852 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-06-09.
- Liu; et al. (10 January 2009). "A Planetary Companion Orbiting to the Intermediate-Mass G Giant HD 173416" (abstract). Research in Astronomy and Astrophysics. 9 (1): 4. Bibcode:2009RAA.....9....1L. doi:10.1088/1674-4527/9/1/001.Full text (pdf)
- "Approved names". NameExoworlds. Retrieved 2020-01-02.
- "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.