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]

HD 173416
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
Distance440 ±31.3 ly
(135 ±9.6 pc)
Absolute magnitude (MV)0.406[2]
Details
Mass2 ±0.3[2] M
Radius13.5 ±0.9[2] R
Luminosity78 ±10[2] L
Surface gravity (log g)2.48 ±0.10[2] cgs
Temperature4683 ±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
SIMBADdata
Exoplanet Archivedata
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]

The HD 173416 planetary system
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

  1. "SIMBAD query result: HIP 91852 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-06-09.
  2. 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)
  3. "Approved names". NameExoworlds. Retrieved 2020-01-02.
  4. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.


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