HD 210702

Starbox short
name = HD 210702
epoch = J2000.0
constell = Pegasus
ra = RA|22|11|51.3
dec = DEC|+16|02|26.0
spectral = K1IV
appmag_v = 5.94
dist_ly = 182.4
dist_pc = 55.9
names = BD+15º4592, GC 31052, HIP 109577, HR 8461, SAO 107729.

HD 210702 is a subgiant star in the constellation Pegasus. With a mass of 1.8 times that of the Sun, the star spent its main-sequence life as an A-type star. The visual luminosity is 11.38 times that of the Sun and it is 182.4 light years away. The magnitude is near the naked-eye limit, but binoculars can easily see the star.

In April 2007, a planet was found orbiting the star.

HD 210702 b

Planetbox begin
name = HD 210702 b Planetbox orbit
semimajor = 1.17
eccentricity = 0.152 ± 0.08
period = 341.1
ang_dist = 20.893
long_peri = 301 ± 30
t_peri = 2453118 ± 40
semi-amp = 59 ± 18Planetbox character
mass = >2 Planetbox discovery
discovery_date = April 2007
discoverers = Johnson et al.
discovery_method = Doppler spectroscopy
discovery_status = Published HD 210702 b, together with HD 175541 b and HD 192699 b, are planets around intermediate mass stars that were announced in April 2007 by Johnson et al. It has twice the mass of Jupiter and it orbits with semimajor axis of 1.17 AU, corresponding to a period of 341.1 days.

Planets around intermediate mass subgiants provide clues for the history of formation and migration of planets around A-type stars.

References

*

ee also

* HD 175541
* HD 192699

External links

* [http://exoplanet.eu/star.php?st=HD+210702 Extrasolar Planets Encyclopaedia: HD 210702]
* [http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=HD+210702&NbIdent=1&Radius=10&Radius.unit=arcmin&submit=submit+id SIMBAD: HD 210702]