HD 168746 b
Encyclopedia
HD 168746 b is an extrasolar planet
orbiting the star
HD 168746
. It has a minimum mass
about one fourth that of Jupiter
, so it is most likely a gas giant
. It orbits very near the star in a so-called "torch orbit" completing one revolution in only about six and half day
s.
Extrasolar planet
An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...
orbiting the star
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...
HD 168746
HD 168746
HD 168746 is an 8th magnitude star in the constellation of Serpens. It is very similar to our Sun, a yellow dwarf star . It is not visible to the unaided eye, but is easily visible with binoculars or a small telescope. In 2000 a planet was announced orbiting it....
. It has a minimum mass
Minimum mass
In astronomy, minimum mass is the lower-bound calculated mass of observed objects such as planets, stars and binary systems, nebulae, and black holes. Minimum mass is a widely cited statistic for extrasolar planets...
about one fourth that of Jupiter
Jupiter
Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...
, so it is most likely a gas giant
Gas giant
A gas giant is a large planet that is not primarily composed of rock or other solid matter. There are four gas giants in the Solar System: Jupiter, Saturn, Uranus, and Neptune...
. It orbits very near the star in a so-called "torch orbit" completing one revolution in only about six and half day
Day
A day is a unit of time, commonly defined as an interval equal to 24 hours. It also can mean that portion of the full day during which a location is illuminated by the light of the sun...
s.
See also
- HD 108147 bHD 108147 bHD 108147 b is a gas giant exoplanet with a minimum mass about half that of Jupiter. It orbits the star in a very tight "torch orbit". The distance between the planet and the star is only a tenth of the distance between Earth and the Sun . A number of such worlds are known to exist, but the...
- HD 130322 bHD 130322 bHD 130322 b is an exoplanet with a minimum mass slightly more than that of Jupiter. It orbits the star in a very close orbit distance being only a quarter that of Mercury from the Sun. It is thus a so-called "hot Jupiter". The planet orbits the star every 10 days 17 hours in a very circular orbit....
- HD 168443 bHD 168443 bHD 168443 b is a planet seven times as massive as Jupiter. Given the high mass, this planet is likely to be a gas giant, or possibly a small brown dwarf depending on the orbital inclination. It orbits closer to its star than Mercury does to the Sun, and its surface temperature is likely to be very...
- HD 169830 bHD 169830 bHD 169830 b is an extrasolar planet three times the mass of Jupiter. Due to its high mass, it is most likely a gas giant planet, akin to Jupiter and Saturn in our own solar system. This planet at 0.8 AU is slightly farther out than Venus is in our solar system, orbiting around its star every 262...
- HD 169830 cHD 169830 cHD 169830 c is an extrasolar planet, most likely a gas giant, three and a half times as massive as Jupiter. It is likely to be smaller in radius but slightly larger than Jupiter. Its orbit is eccentric, with a period of 1830 days....
- HD 82943 bHD 82943 bHD 82943 b is an extrasolar planet approximately 89 light-years away in the constellation of Hydra. The planet was announced in 2000 by the Geneva Extrasolar Planet Search Team. The planet is the outermost planet of two....