HD 210702 b
Encyclopedia
HD 210702 b is an exoplanet located approximately 182 light-year
s away in the constellation
of Pegasus
, orbiting the star
HD 210702
. This planet, 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 at least twice the mass
of Jupiter
and it orbit
s with semimajor axis of 1.17 AU
, corresponding to a period of 341.1 day
s.
Planets around intermediate mass subgiants provide clues for the history of formation and migration
of planets around A-type stars.
Light-year
A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...
s away in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
of Pegasus
Pegasus (constellation)
Pegasus is a constellation in the northern sky, named after the winged horse Pegasus in Greek mythology. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations.-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 210702
HD 210702
|- bgcolor = "#FFFAFA"HD 210702 is an orange subgiant star located approximately 179 light-years away in the constellation of 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...
. This planet, together with HD 175541 b
HD 175541 b
HD 175541 b is a jovian planet located approximately 416 light-years away in the constellation of Serpens, orbiting the star HD 175541. This planet was discovered in April 2007...
and HD 192699 b
HD 192699 b
HD 192699 b is an exoplanet located approximately 220 light-years away in the constellation of Aquila, orbiting the star HD 192699. This planet was discovered in April 2007, massing at least 2.5 times the mass of Jupiter...
, are planets around intermediate mass stars that were announced in April 2007 by Johnson et al. It has at least twice the mass
Mass
Mass can be defined as a quantitive measure of the resistance an object has to change in its velocity.In physics, mass commonly refers to any of the following three properties of matter, which have been shown experimentally to be equivalent:...
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,...
and it orbit
Orbit
In physics, an orbit is the gravitationally curved path of an object around a point in space, for example the orbit of a planet around the center of a star system, such as the Solar System...
s with semimajor axis of 1.17 AU
Astronomical unit
An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....
, corresponding to a period of 341.1 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.
Planets around intermediate mass subgiants provide clues for the history of formation and migration
Planetary migration
Planetary migration occurs when a planet or other stellar satellite interacts with a disk of gas or planetesimals, resulting in the alteration of the satellite's orbital parameters, especially its semi-major axis...
of planets around A-type stars.