Orbital Elements
The motion of planets around the Sun can be described by Kepler's three laws of planetary motion: ...
ORBITAL ELEMENTS - Quantities used to describe exactly where planet is in its orbit and how the orbit is oriented. Elements defining the shape of an orbit are the semi-major axis (a), orbital eccentricity (e) and perihelion distance (p).
Orbital elements. Parameters (numbers) that determine an object's location and motion in its orbit about another object.
Orbital Elements
Seven quantities needed to establish the orbit of a celestial body (see elements of an orbit).
Orbital Velocity ...
Orbital Elements The six numerical values that completely define the orbit of one body about another of known mass.
Orbital elements -- Variables which characterize the motion of an orbiting body.
The proper orbital elements of an orbit are constants of motion of an object in space that remain practically unchanged over an astronomically long timescale....
University of Pisa, Italy.
Orbital Elements
The contents of this web site are finally at a point where I can say "final edition", except for any future data corrections.
Epochs for orbital elements are usually given in Terrestrial Time, in several different formats, including:
* Gregorian date with 24-hour time: 2000 Jan. 1, 12:00 TT
* Gregorian date with fractional day: 2000 Jan. 1.5 TT ...
In terms of orbital elements, NEOs are asteroids and comets with perihelion distance q less than 1.3 AU. Near-Earth Comets (NECs) are further restricted to include only short-period comets (i.e., orbital period P less than 200 years).
The Asteroid Orbital Elements Database
Astronomy Internet Resources (QMUL Astronomy Unit)
Astronomy Picture of the Day
The Aurora Page
Auroral Activity Report
Cometography.com
The Constellations and Their Stars
The Dome of the Sky ...
Main article: Orbital elements
It turns out that it takes a minimum 6 numbers to specify an orbit about a body, and this can be done in several ways.
orbital elements (NASA Thesaurus / NASA SP-7, 1965) A set of seven parameters defining the orbit of a body attracted by a central, inverse-square force.
Several different sets of parameters have been used.
JPL Horizons: Mean orbital elements referred to the local Laplace planes, Epoch 2000 Jan. 1.50.
JPL Horizons: Mean orbital elements referred to the Saturn equator, Epoch 2004 Jan. 1.00.
Other motions regarded as librations are long period orbital motions and periodic perturbation in orbital elements. LIDAR Acronym for LIght Detection And Ranging. Like RADAR, except lidar uses light (laser) instead of radio waves.
^ a b c d e f g h i j k l m n o p q r s t Orbital elements and abundance analyses of the double-lined spectroscopic binary alpha Andromedae, T. A. Ryabchikova, V. P.
Waltemath gave orbital elements for one of these moons: distance from Earth 1.03 million km, diameter 700 km, orbital period 119 days, synodic period 177 days.
At first Piazzi thought that he had discovered a comet; however, after the orbital elements of the object had been computed it became clear that the object moved in a planetlike orbit between the orbits of Mars and Jupiter.
However, a few months later, considerably better orbital elements for Pluto was obtained. Below is a comparison of the orbital elements of Lowell's Planet X, Pickering's Planet O, and Pluto: Lowell's X Pickering's O Pluto a (mean dist) 43.0 55.1 39.
The new Sixth Catalog of Orbits of Visual Binaries provides two very old estimates of orbital elements for 41 Arae A and its companion.
These quantities, which determine the size, shape, and position of a planet's orbit, are known as the orbital elements.
Here is a general information source on Near Earth Objects (NEOs) and here is a listing of asteroids that come near the Earth and their orbital elements (the orbital elements allow their orbit to be plotted with the Solar System Live software).
It is typically a function of the body's orbital elements a,e,i and absolute magnitude H.
He noted that three of these, the comets of 1531, 1607, and 1682, had very similar orbital elements, and he was further able to account for the slight differences in their orbits in terms of gravitational perturbation by Jupiter and Saturn.
Within the main belt are groups of asteroids that cluster with respect to certain mean orbital elements (semimajor axis, eccentricity, and inclination). Such groups are called families and are named for the lowest numbered asteroid in the family.
By comparing the orbital elements of a number of earlier comets, the British astronomer Edmund Halley showed the comet of 1682 to be identical with the two that had appeared in 1607 and 1531, ...
Apart from the instances alluded to there seem few coincidences between the orbital elements of comets and meteors. Halley's comet conforms very well, however, with a meteoric shower directed from Aquarius early in May.
In the following years it was followed through 5 oppositions and the orbital elements were well determined. This asteroid has an H or absolute magnitude of 12.5.
The Laplace plane (as used in our satellite orbital elements tables) is defined as the plane in which the satellite's nodal precession is contained (on average). An equivalent definition is the plane normal to the satellite's orbital precession pole.
Asteroid family: Group of asteroids with similar orbital elements (distance from the Sun, inclination of the orbital plane to the Earth's orbital plane, and eccentricity of the orbit) thought to be remnants of one larger asteroid parent.
A Dictionary of Astronomy entry for orbital elements
A Dictionary of Astronomy entry for orbit
A Dictionary of Nursing entry for orbit
A Dictionary of Biology entry for orbit
The Concise Oxford Dictionary of English Etymology entry for orbit ...
There are various ways to express the orbital elements. Three popular formats are:
NASA/NORAD 2-Line Format
AMSAT Format
One-Line "Charlie" Elements Format ...
The path in space followed by a celestial body. [S92]
Orbital Elements
Seven quantities needed to establish the orbit of a celestial body (see elements of an orbit). [H76]
Orbital Velocity ...
In 1994-98, the tropical year was 365.242190 days long. An expression based on the orbital elements of Laskar (1986) for calculating the length of the tropical year is given by
where
and JD is the (Doggett 1992).
Ephemeris (plural ephemerides) A tabulated list of positions for an object calculated from its orbital elements.
And, since the inclination of orbits is much less subject to gravitational perturbations than other orbital elements, they really don't have any driving force to put them back into an orbit with the rest of the solar system.
and the perihelion of an orbit around the Sun, measured in the orbital plane and in the direction of orbital motion. The argument of perihelion specifies the direction of the major axis of an orbit around the Sun and is one of the orbital elements.
AU further above the plane it will feel a different downward pull toward the midplane than the Sun," lead author Nathan Kaib explains. "As a result, the comet feels an extra force in addition to the Sun's gravity. This causes its orbital elements to ...
Hubble orbits once every 96 minutes 35 seconds and reaches latitudes lower than 28.47 degrees. Map generated by "OrbiTrack'' version 2.1.4 with NASA orbital elements set 795.
Click here for a larger version of this image.
 See also: Elements, Element, Orbit, Planet, Solar
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