HD 173416 b

HD 173416 b
Exoplanet List of exoplanets
Parent star
Star HD 173416
Constellation Lyra
Right ascension (α) 18h 43m 36.1097s
Declination (δ) +36° 33′ 23.777″
Apparent magnitude (mV) 6.057
Distance440 ± 31.3 ly
(135 ± 9.6 pc)
Spectral type G8III
Orbital elements
Semi-major axis(a) 1.16 ± 0.06 AU
Periastron (q) 0.92 AU
Apastron (Q) 1.40 AU
Eccentricity (e) 0.21 ± 0.04
Orbital period(P) 323.6 ± 2.2 d
(0.8860 ± 0.0060 y)
Orbital speed (υ) 39.13 km/s
Argument of
periastron		 (ω) 254 ± 11°
Time of periastron (T0) 3465.8 ± 8.3 JD
Physical characteristics
Minimum mass(m sin i)2.7 ± 0.3 MJ
(860 ± 100 M⊕)
Discovery information
Discovery date January 10, 2009
Discoverer(s) Liu et al.
Discovery method radial velocity
Discovery status Published
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata
Exoplanet Archivedata
Open Exoplanet Cataloguedata

HD 173416 b is an extrasolar planet located approximately 440 light years away in the constellation of Lyra, orbiting the 6th magnitude G-type giant star HD 173416. This is planet has at least 2.7 times the mass of Jupiter and was discovered on January 10, 2009 by Liu et al. HD 173416 b orbits at 1.16 AU from the star. However, despite the fact that the planet orbits 16% further from the star than Earth does from the Sun, it has orbital period of only 323.6 days, compared to 365.25 days for Earth. This inverse relationship is caused by the parent star having twice the mass of our Sun, which increases the strength of its gravitational field. This evidence implies that when this star was on the main sequence, it was an A-type star.

References

  • 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.
  • "HD 173416 b". Exoplanets.

Coordinates: 18h 43m 36.1097s, +36° 33′ 23.777″


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