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the following is a list of local stars whose systems are habitable and the planets that orbit them.
the stars are listed in order of increasing distance from the reference system; šun, and the planets are listed in order of increasing distance from their parent star.
half of the units used on this page are relative; ⊕M, ⊕R, ⊕d, and ⊕hr refer to earth masses, earth radii, earth days, and earth hours respectively, ♃M refers to jupiter masses, and ☉M and ☉R to solar masses and radii.
the format for stellar descriptions is as follows:
- spectral type: classification of the star based on its spectral characteristics. the stars covered on this page will be of spectral types G or K.
- physical characteristics
- mass: the weight of the star
- radius: the distance between the core of the star and its surface
- temperature: how hot the star is
- distance: the distance between the star and the reference system, šun
- semi-major axis: the average distance between the companion star and its main star
- eccentricity: how circular a companion star's orbit is; 0 being perfectly circular, and 1 being a parabola
- absolute magnitude: a measure of how bright the star is
- number of planets that orbit the star (dwarf planets, asteroids, comets, and other small bodies not included)
the format for planetary and lunar descriptions is as follows:
- if the body is not gravitationally rounded, it is listed as irregular
- composition:
- rocky: mainly composed of silicates and/or metals
- gas giant: mainly composed of hydrogen and helium
- ice giant: mainly composed of icy volatiles
- atmosphere:
- for gas/ice giants, the main cloud-forming substances are given, if present
- no atmosphere: there technically still is a mixture of gases around the body, but it is extremely tenuous; whatever gases are present usually easily escape but are at the same time replenished by various processes that occur on the surface.
- thin atmosphere: pressure between 1 Pa and 1 kPa, or 0.00001 atm and 0.01 atm
- mid atmosphere: pressure between 1kPa and 1MPa, or 0.01 atm and 10 atm
- thick atmosphere: pressures over 1MPa, or 10 atm
- number of moons
- physical characteristics
- mass: the weight of the planet
- radius: the distance between the core of the planet and its surface
- rotation: how fast the planet spins on its axis. if tidally locked, this means the same side always faces its parent. retrograde motion, indicated with a negative number, means the planet is spinning in the opposite direction.
- orbital characteristics
- semi-major axis: the average distance between the planet and its star
- eccentricity: how circular its orbit is; 0 being perfectly circular, and 1 being a parabola
- inclination: the angle between the planet's orbit and some reference plane. the plane of the orbit of the main planet of a system is usually taken as said reference plane; called the ecliptic.
list of systems:
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