Orbiting Astronomical Observatory
OAO-3 in the clean room
The Orbiting Astronomical Observatory (OAO) satellites were a series of four space observatories launched by NASA between 1966 and 1972, ...
Orbits
The motion of a massive body around another body, governed by the force of gravity. Planets in our solar system follow an orbit around the Sun, as first noted by Johannes Kepler, in the shape of an ellipse.
Orbital Eccentricity
The orbital eccentricity (or eccentricity) is a measure of how much an elliptical orbit is 'squashed'.
Orbit
Related Category: Astronomy: General
in astronomy, path in space described by a body revolving about a second body where the motion of the orbiting bodies is dominated by their mutual gravitational attraction.
Orbits
According to the IAU decision, the solar system will now have a total of 8 planets and 3 'dwarf planets': Pluto, Ceres and the unnamed 2003 UB313.
orbit
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Essential reading Compare
side-by-side A Dictionary of Earth Sciences A Dictionary of Zoology The Columbia Encyclopedia, ...
Orbital speed
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Orbits:
Earth orbital flight is achieved by launching vertically and then tilting the trajectory so that flight is parallel to the Earth's surface at the time that orbital velocity at the desired altitude is reached.
Orbital Motion: motion of a particle with a /r2 central force applied. In intro physics the topic was the motion of planets under the influence of the Sun's gravitational force...orbital mechanics.
orbit
space definitions
Definition: orbit: The path followed by an object in space as it goes around another object.
Space Tragedies9 Planets in Nine DaysAstronomy 101 ...
Orbit and
Phases of the Moon
The orbit of the Moon is very nearly circular (eccentricity ~ 0.05) with a mean separation from the Earth of about 384,000 km, which is about 60 Earth radii.
The fifth Orbiting Geophysical Observatory, OGO-5, was launched on 4 March 1968. The satellite, primarily devoted to Earth observation, was in a highly elliptical initial orbit with a 272 km perigee and an 148,228 km apogee.
All space orbits obey the laws of Kepler and Newton. As already noted, for circular orbits Kepler's third law may be written
T = 5063 seconds R3/2 = 5063 seconds R * SQRT(R) ...
NOTE: Animations of elliptical orbits were created using four variables: semi-major axis, period, eccentricity, and inclination. In order to improve the initial displays for the Solar System, the xy plane has been rotated (300°) and tilted (60°).
ORBITS OF ASTEROIDS
Because of their large numbers, asteroids are assigned numbers as well as names. The numbers are assigned consecutively after accurate orbital elements have been determined.
Orbital Data for the Planets
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Lunar orbiter yielding rich results at six-month mark
Stephen Clark
SPACEFLIGHT NOW
Posted: December 21, 2009 ...
Why Is Orbital Debris Important?
Most "space junk" is moving very fast. It can reach speeds of 4.3 to 5 miles per second. Five miles per second is 18,000 miles per hour. That speed is almost seven times faster than a bullet.
Apollo orbits the Moon
An Apollo Command Service Module in orbit around the Moon. This photograph was taken from the LEM as it broke away to land on the lunar surface.
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IRAS In Orbit - Artist's Rendition
The artist's rendering shows the Infrared Astronomical Satellite (IRAS) in its 560-mile-high, near-polar orbit above the Earth.
Orbiting Venus
On August 10, 1990, entered into orbit about , as depicted in this artist's view.
The Orbiter has as its primary science objectives to: 1) monitor the daily weather and atmospheric conditions; 2) record changes on the martian surface due to wind and other atmospheric effects; 3) determine temperature profiles of the atmosphere; 4) ...
The orbiter was to have studied the planet's atmosphere, climate, meteorology and volatile surface materials such as water ice and frozen carbon dioxide. It also was to have relayed the lander's radio signals to Earth.
a is the orbital distance of the minor body from the major body
m is the mass of the minor body
M is the mass of the major body ...
Names and orbits of asteroids
Distribution and Kirkwood gaps
Near-Earth asteroids
Main-belt asteroid families
Hungarias and outer-belt asteroids
Trojan asteroids ...
Diagrams of the Orbits of the Planets
The diagrams on this page show the positions of the major planets, and the two brightest asteroids, in their orbits. The orbits are in correct relative scale.
it is locked in phase with its orbit so that the same side is always facing toward the Earth.
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This is a thumbnail of the Mars Book - Orbit, Year. The full-size printout is available only to site members.To subscribe to Enchanted Learning, click here. If you are already a site member, click here.
Orbital Speed
The mass formula above tells you that satellites orbiting massive planets must move faster than satellites orbiting low-mass planets at the same distance.
ORBITAL PROPERTIES
European astronomers discovered the first asteroids early in the nineteenth century as they searched the sky for an additional planet orbiting between Mars and Jupiter, ...
Orbital Characteristics
Sedna has a highly elliptical orbit, with its aphelion estimated at 942 AU and its perihelion at about 76.1 AU. At its discovery, it was about 90 AU from the Sun, approaching perihelion.
Orbital Period
The time required for an object to make a complete revolution along its orbit. For example, the orbital period for a typical main-belt asteroid is about 4 years.
Orbit of 16 Cyg B b around 16 Cyg B (HD 186427)
References
Cochran W., Hatzes A., Butler P., and Marcy G. "The discovery of a planetary companion to 16 Cyg B," Astrophysical Journal, 483, 457 (1997).
Hauser, H., and Marcy, G.
Orbital Inclination of the Planets in our Solar System
PlanetOrbital Inclination
Mercury
7° ...
orbit
the path an object follows around a more massive object or common center of mass; usually elliptical in shape
orbital period ...
orbit (of the Earth): the path of the Earth around the sun. For dialling purposes, this is taken as elliptical (or even circular), with a very small eccentricity, i.e.
Orbiting the Galaxy
In addition to the individual motions of the stars within it, the entire Galaxy is in spinning motion like an enormous pinwheel.
ORBit is a Common Object Request Broker Architecture 2.4 compliant Object Request Broker . It features mature C , C++ and Python bindings, and less developed bindings for Perl, Lisp , Pascal , Ruby , and Tcl....
, and the level of greenhouse gas ...
Orbit Trim Maneuvers: Small changes in a spacecraft's orbit around a planet may be desired for the purpose of adjusting an instrument's field-of-view footprint, improving sensitivity of a gravity field survey, or preventing too much orbital decay.
Orbital elements. Parameters (numbers) that determine an object's location and motion in its orbit about another object.
Orbit The path followed by one body as it moves around another.
Parallax An apparent shift in the positions of nearby stars (relative to more distant ones) from the changing position of the Earth in its orbit around the Sun.
Orbital Velocity
Velocity required by a body to achieve a circular orbit around its primary: Vorb = (GM / r)1/2.
Orbiting Collision ...
Orbit
All planets revolve around stars. In the Solar System, all the planets orbit in sync with the Sun's rotation. It is not yet known whether all extrasolar planets follow this pattern.
Orbital Elements The six numerical values that completely define the orbit of one body about another of known mass.
Orbit- the path followed by any celestial object moving under the control of another's gravity ...
orbit
The elliptical path of an object that is gravitationally bound to another object.
open cluster
A loose collection of hundreds of stars that are gravitationally bound to each other. Also known as a galactic cluster.
orbit
The path of an object that is moving around a second object or point.
OSO 8
Orbiting Solar Observatory 8 ...
Orbit. The path of a celestial body around its parent body.
Orrery. A model showing the Sun and planets.
Orbit - The elliptical or circular path followed by a body that is bound to another body by their mutual gravitational attraction
Organic molecule - A molecule containing carbon ...
Orbiting Astronomical Observatory [LLM96]
OB
Spectral type O or B - that is, hot and blue. [C95]
O Star ...
Orbit of the solar system
The solar system is part of the Milky Way galaxy, a spiral galaxy with a diameter of about 100,000 light years containing approximately 200 billion stars, of which our Sun is fairly typical.
The orbit of Saturn shown at two/three year intervals between the years 1993 and 2020 AD. The orbit of the Earth is seen close to the centre, marked at various dates by a blue-green globe (the orbits are not shown to scale).
Mars Orbiter Laser Altimeter (MOLA): Instrument onboard the Mars Global Surveyor spacecraft that has been obtaining topographic data since March 1999.
SPIN-ORBIT RESONANCE - State that a body is said to be in if its rotation period and its orbital period are related in a simple way.
is in orbit around the sun. The first criterion limits the definition to our own solar system. With the discovery of new extrasolar planets by the day, it should be noted that such objects are covered under a separate agreement signed in 2003.
Comets orbit around the Sun just like planets, but their orbits are more elongated and take longer. Most of them go beyond Pluto! Periodic comets are those that have an orbit of less than 200 years, but they make up the minority of known comets.
Closed Orbit
Closed Universe
A model universe in which the average density is great enough to stop the expansion and make the universe contract.
Uranus' Orbit
Uranus has a diameter of 51,120 km (31,771 miles), and its mean distance from the sun is 2.87 billion km (1.78 billion miles).
Minimal Orbital Intersection Distance (MOID);
The MOID is the minimal distance between the orbits of two objects.
orbits so nearly circular in form that the unaided eye would not notice the deviation from that form.
 See also: Earth, Sun, Solar, Planet, Light
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