HD 122430

Starbox short
name = HD 122430
epoch = J2000.0
constell = Hydra
ra = 14h 02m 22.782s
dec = −27º 25' 47.18″
spectral = K3III
appmag_v = 5.48
absmag_v = -0.17
dist_ly = 440
dist_pc = 135
names = CD-26 10060, HIP 68581, HR 5265, SAO 182182

HD 122430 is an orange giant star located in the constellation Hydra on the celestial sphere. The star has completely run out of the hydrogen fuel, which keeps the star stable, although its age is only 3.1 billion years old, younger than the Sun’s 4.6 billion years. HD122430 has a mass of 1.4 times and radius of 22.9 times that of the sun. Despite its younger age, it has slightly lower metallicity, approximately 90%. The temperature of its surface [photosphere] is approximately 4300 Kelvins.

HD 122430 b

Planetbox begin
name = HD 122430 b Planetbox orbit
semimajor = 1.02
eccentricity = 0.68±0.09
period = 344.95±1.08
ang_dist = 7.56
long_peri = 91.04±17.27
t_peri = 2451986.71±3.75
semi-amp = 2.02Planetbox character
mass = >3.71 Planetbox discovery
discovery_date = 2003
discoverers = Setiawan et al.
discovery_site = Spain
discovery_method = radial velocity
discovery_status=Published HD 122430 b is a giant planet orbiting around the giant star HD 122430. It is a superjovian-type with mass greater than 3.71 times that of Jupiter. This planet located at a distance of 1.02 astronomical units away from its star, which is very similar to the Earth’s distance from the Sun. Despite of this, the planet is too hot for it to have liquid water or life on any of the planet’s moons. Also, its orbit is highly eccentric, around 68%. At periastron, the orbital distance from its parent star is 0.33 AU. At apastron, the distance is 1.71 AU. If this planet were located in our own solar system, its orbit would ranges from just within Mercury’s orbit to just beyond Mars’s orbit.

In Spain, Setiawan discovered this planet in 2003, using his radial velocity method.

References

*cite journal |url=http://adsabs.harvard.edu/abs/2003ESASP.539..595S |author=Setiawan, J. |title=Planets around evolved stars
journal=ARI |year=2003 |volume= |pages=595–598 |accessdate=2007-12-07

External links

*cite web |url=http://exoplanet.eu/star.php?st=HD+122430 |title=Notes for star HD 122430 |work=The Extrasolar Planets Encyclopaedia |accessdate=December 7 |accessyear=2007
*cite web |url=http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=HD+122430&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id |title=HD 122430 -- Star |work=SIMBAD |accessdate=December 7 |accessyear=2007