HD 192263 b
Encyclopedia
HD 192263 b is a gas giant
planet
with a mass about three quarters that of Jupiter mass
. It orbits the star in a circular orbit completing one revolution in 24 day
s or so.
In 2002 the existence of the planet was questioned by G. Henry: The star was observed to have photometric
brightness variations that have same period and velocities as the planet. The signal could come from those variations instead of the planet orbiting the star or suggests that rotational modulation of the visibility of stellar surface activity is the source of the observed radial velocity
variations. Finally, in 2003 the planet was confirmed; the planet is thought to be causing fluctuations in the system's magnetic field
, causing visible activity.
Preliminary astrometry in 2001 set its inclination at 179.5; but it is now thought to be inclined according to the star's ecliptic, edge-on to Earth.
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...
planet
Planet
A planet is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, science,...
with a mass about three quarters that of Jupiter mass
Jupiter mass
Jupiter mass , is the unit of mass equal to the total mass of the planet Jupiter . Jupiter mass is used to describe masses of the gas giants, such as the outer planets and extrasolar planets. It is also used in describing brown dwarfs....
. It orbits the star in a circular orbit completing one revolution in 24 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 or so.
In 2002 the existence of the planet was questioned by G. Henry: The star was observed to have photometric
Photometry (astronomy)
Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation...
brightness variations that have same period and velocities as the planet. The signal could come from those variations instead of the planet orbiting the star or suggests that rotational modulation of the visibility of stellar surface activity is the source of the observed radial velocity
Radial velocity
Radial velocity is the velocity of an object in the direction of the line of sight . In astronomy, radial velocity most commonly refers to the spectroscopic radial velocity...
variations. Finally, in 2003 the planet was confirmed; the planet is thought to be causing fluctuations in the system's magnetic field
Magnetic field
A magnetic field is a mathematical description of the magnetic influence of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude ; as such it is a vector field.Technically, a magnetic field is a pseudo vector;...
, causing visible activity.
Preliminary astrometry in 2001 set its inclination at 179.5; but it is now thought to be inclined according to the star's ecliptic, edge-on to Earth.