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Perihelion

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Perihelion
A planet in an elliptical orbit around the Sun is closest to the Sun at perihelion.


Perihelion
Related Category: Astronomy: General
(pr´´h´ln), point nearest the sun in the orbit of a body about the sun. See apsis.

Perihelion!
Does the Sun look a little brighter to you? Maybe that's because at nine minutes after midnight (UT) tonight, January 2/3, the Earth will be at perihelion, the closest point on its elliptical orbit to the Sun.

perihelion at HighBeam Research
perihelion on Wikipedia
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Definition: perihelion: The orbital point of closest approach to the Sun.
Space Tragedies9 Planets in Nine DaysAstronomy 101
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At perihelion, Earth's distance from the Sun is r=a(1-e) and at aphelion, it's r=a(1+e).
G=6.673*10-11 N m^2/kg^2
M=1.989*1030 kg ...

Aphelion - the point in an orbit that is farthest from the sun.
Perihelion - the point in an orbit that is closest to the sun.
Sun - the star in our Solar System.
Planet - a large celestial body that orbits a star.

perihelion The closest approach to the Sun of any object in orbit about it.
period The time needed for an orbiting body to complete one revolution about another body.

Perihelion Distance
The distance between the orbiting body and the sun at it's closest approach.

perihelion -- the point in the orbit of the Earth that is closest to the Sun. Currently the Earth reaches perihelion in early January.
prominence -- a large-scale gaseous formation above the surface of the Sun.

Perihelion
All of the planets in our Solar System move around the Sun in elliptical orbits. An ellipse is a shape that can be thought of as a "stretched out" circle or an oval as in the diagram below.

Perihelion
The point in the orbit of an object orbiting the Sun where it is closest to the Sun's center of mass. Earth's perihelion occurs early in January.
Period ...

Perihelion
The point in an object's orbit when it is closest to the Sun (Helios = Sun). Earth is at perihelion each year on about Jan. 3.

Perihelion- a planet or comet's closest approach to the sun
Periodic time- (see sidereal period)
Perturb- to cause a planet or satellite to deviate from a theoretically regular orbital motion ...

Perihelion The position in a heliocentric orbit at which the orbiting object is at its least distance from the Sun.
Phase The percentage illumination, from the observer's perspective, of an object (normally planet or Moon).

perihelion
The point in its orbit where a planet is nearest the Sun.
period-luminosity relation
A relationship between the period and average density of a pulsating star.

perihelion
The point in its orbit where a planet is at its closest to the Sun. Opposite of aphelion.
period-luminosity relationship
The predictable relation between the pulsation period and changes in luminosity of a Cepheid variable star.

Perihelion
the point in the orbit of a planet or other body where it is closest to the Sun.
Perturb
to cause a planet or satellite to deviate from a theoretically regular orbital motion.

Perihelion: Point in the elliptical orbit of a comet about the Sun in which it passes closest to the Sun.

perihelion: The orbital point of closest approach to the sun.
period-luminosity relation: The relation between period of pulsation and intrinsic brightness among Cepheid variable stars.


PERIHELION
The perihelion is a planet or comet's closest approach to the Sun. The Earth is at perihelion (the Earth is closest to the Sun) in January.
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Perihelion:
The point on an orbit nearest the sun.
Planet:
Large spherical object shining by a star. Our planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto (+Charon ?) ...

Perihelion distance: 0.587 AU
Orbital eccentricity: 0.967
Orbital inclination: 162.24
Orbital period: 76.0 years
Next perihelion: 2061
Diameter: 16 x 8 x 8 km ...

Perihelion and Aphelion are the planet's closest and furthest distances from the Sun, measured in Astronomical Units (AU). 1 AU is defined by the average distance from the Earth to the Sun.
The globes of the planets ...

Perihelion
When the orbit of a planet takes it to the point closest to the Sun.
Planet ...

Perihelion
When an object which revolves around the Sun is at the closest point it gets to the Sun.
Perturbations ...

perihelion -- The point in the path of a planet, asteroid, comet, or other body that is closest to the sun.
Proteus -- In Greek mythology, the son of Poseidon. Personification of the shifting winds and moods of the sea.

perihelion - (n.)
The near point to the sun of the orbit of a body orbiting the sun.
periodic table - (n.) ...

perihelion
That point on the orbit of a Sun-orbiting body nearest to the Sun. Compare aphelion.
persistence ...

At perihelion, when the Earth is closest to the sun, the Earth has a greater angular speed (by Kepler's second law), so the sun has a greater angular speed relative to the Earth.

After perihelion, Comet ISON will fade rapidly, and will keep brighter than magnitude +2 or +3 for just a few days. This is about as bright as the stars in Orion's belt.

2.74 at perihelion
*This table is mainly from the 1965 edition of the Dictionary of Technical Terms for Aerospace Use (NASA SP-7).
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Aphelion / Perihelion is an object's orbital point (in distance and time) around a star where the object's distance (on its elliptical orbit) from its parent star is farthest / closest.

See also: See also: Orbit, Sun, Earth, Planet, Solar

Astronomy  Perigee  Perihelion distance

 
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