HD 130322
Template:Short description Template:Starbox begin Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox detail Template:Starbox catalogue Template:Starbox reference Template:Starbox end
HD 130322 is a star with a close orbiting exoplanet in the constellation of Virgo. The distance to this system is 104 light-years, as determined using parallax measurements. It is drifting closer to the Sun with a radial velocity of −12.4 km/s.<ref name=Soubiran_et_al_2018/> With an apparent visual magnitude of 8.04,<ref name=Anderson_Francis_2012/> it is too dim to be visible to the naked eye; requiring binoculars or a small telescope to view. Being almost exactly on the celestial equator the star is visible everywhere in the world except for the North Pole. The star shows a high proper motion, traversing the celestial sphere at an angular rate of Template:Val.<ref name=Luyten1995/>
The spectrum of this star presents as a K-type main-sequence star, an orange dwarf, with a stellar classification of K0V.<ref name=Houk_Swift_1999/> The star has 92% of the mass of the Sun and 85% of the Sun's radius. It is spinning with a rotation period of 26.5 days.<ref name="Hinkel2015"/> HD 130322 is radiating 62%<ref name=Anderson_Francis_2012/> of the luminosity of the Sun from its photosphere at an effective temperature of 5,387 K.<ref name="Hinkel2015"/> It is estimated to be around six billion years old.<ref name=Bonfanti_et_al_2016/>
The star HD 130322 is named Mönch and its companion is Eiger. The names were selected in the NameExoWorlds campaign by Switzerland, during the 100th anniversary of the IAU. Mönch and Eiger are prominent peaks of the Bernese Alps.<ref name=exoworlds/><ref name=IAU/>
Planetary systemEdit
In 2000, an extrasolar planet was discovered orbiting the star using Doppler spectroscopy. As the inclination of the orbital plane is unknown, only a lower bound on the mass can be estimated. Most likely this is a hot Jupiter as it is orbiting close to the host star and has at least the mass of Jupiter.<ref name="Udry2000"/>
The star rotates at an inclination of 76Template:± degrees relative to Earth.<ref name=mnras408_3_1666/> It has been assumed that the planet shares that inclination.<ref name=exoplaneteu/> But several "hot Jupiters" are known to be oblique relative to the stellar axis.<ref name="Ojeda"/>
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:Orbitbox end