HD 170469

Starbox short
name = HD 170469
epoch = J2000.0
constell = Ophiuchus
ra = 18^h 29^m 11^s
dec = +11º 41' 44"
spectral = G5IV
appmag_v = 8.21
dist_ly = 211.91
dist_pc = 64.97
names = BD +11º3479, SAO 103765, HIP 90593

HD 170469 is a yellow subgiant star in the constellation Ophiuchus. It has apparent magnitude +8.21 and it is 211.91 ly away.

In 2007, the planet was discovered by using N2K Consortium by Fischer.

HD 170469 b

Planetbox begin
name = HD 170469 Planetbox orbit
semimajor = 2.07
eccentricity = 0.36
period = 1143
ang_dist = 30.783
long_peri = 73 ± 19
t_peri = 2,451,826 ± 4
semi-amp = 23.8 Planetbox character
mass = >0.67 Planetbox discovery
discovery_date = April 10, 2007
discoverers = Fischer et al.
discovery_location = California, USA
discovery_method = Radial velocity
discovery_status=Published HD 170469 b is a gas giant planet orbiting HD 170469. It is 67% the mass of Jupiter. The mass value is only minimum since if inclination is unknown.

The orbital distance is more than twice the distance from Earth to the Sun, although taking over three Earth years to orbit the star. The combined distance and period would make orbital velocity of 19.1 km/s, slower than Earth's 29.8 km/s. However, the orbit is very eccentric, meaning the orbital distance and orbital velocity can vary drastically. At periastron, the distance is 1.32 AU and velocity of 22.3 km/s. At apastron, the distance is 2.82 AU and velocity of 16.4 km/s. This type of Jupiter-like planet is called eccentric Jupiter.

References

* [http://arxiv.org/abs/0704.1191 web preprint]

External links

* [http://exoplanet.eu/star.php?st=HD+170469 The Extrasolar Planets Encyclopedia: HD 170469]
* [http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=HD+170469&NbIdent=1&Radius=10&Radius.unit=arcmin&submit=submit+id SIMBAD: HD 170469]