NOTABLE STARS EXTRASOLAR PLANETS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site HD 210277 A star slightly larger than the Sun, in the constellation of Aquarius, around which has been discovered a planet similar in mass to Jupiter. This was the first extrasolar planet to be found whose average distance from its host star is nearly the same as that of the Earth from the Sun. However, its orbit is so elongated that its separation from HD 210277 varies between less than the Venus-Sun distance and more than the Mars-Sun distance. As a result, the planet must be subject to extreme seasonal changes in temperature. Host star Distance 71.8 light-years (22.1 pc) Spectral type G0 V Apparent magnitude 6.63 Temperature 5,300°C Luminosity (Sun=1) 0.93 Mass (Sun=1) 0.99 Position R.A. 22h 09m 29s, Dec. -07° 32' 33" Planet Mass (Jupiter=1) 1.28 Semi-major axis 1.15 AU (172 million km, 107 million miles) Orbital period 437 days Eccentricity 0.45 Discovery 1999, 1998, Marcy et al., SFSU Planet Search, Keck Method radial velocity Related categories    • NOTABLE STARS    • EXTRASOLAR PLANETS AND SUBSTELLAR OBJECTS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP