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Topic: Orbital period

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In the News (Wed 20 Feb 19)

  Physics Simulation and Java - Lecture 13B: Introduction to Java Networking
is one with an orbital period equal to the period of the rotation of the Earth.
A mathematical relationship exists between the orbital period and the size of the orbit, i.e., the distance between the center of the Earth and the satellite.
The relationship states that the square of the orbital period is proportional to the cube of the size of the orbit.
www.particle.kth.se /~fmi/kurs/PhysicsSimulation/Lectures/13B   (232 words)

  What is the orbital period of the Moon?
The sidereal period of the Moon is the time needed for it to return to the same position against the background of stars.
The synodic period is the time required for a body within the solar system, such as a planet, the Moon, or an artificial Earth satellite, to return to the same or approximately the same position relative to the Sun as seen by an observer on the Earth.
The synodic period is related to the lunar phases; it depends on the relative locations of the Sun-Earth-Moon.
starchild.gsfc.nasa.gov /docs/StarChild/questions/question32.html   (510 words)

  CSA - Orbital
If exactly the right amount of energy is added to the satellite's orbital motion, it will assume a new orbit which is exactly circular and with an orbital period of 24 hours.
This circular orbit is called a geosynchronous orbit because the orbital period (24h) of a satellite in this orbit is synchronized with the rotational period (24h) of the Earth.
For reasons of fuel efficiency the changes in the orbital plane of a satellite are almost always made at the largest possible orbital distance from the Earth.
www.space.gc.ca /asc/eng/educators/resources/orbital/orbital_planes.asp   (508 words)

  Planetary Fact Sheet Notes
Orbital Period (days) - This is the time in Earth days for a planet to orbit the Sun from one vernal equinox to the next.
Orbital Velocity (km/s or miles/s) - The average velocity or speed of the planet as it orbits the Sun, in kilometers per second or miles per second.
Orbital Inclination (degrees) - The angle in degrees at which a planets orbit around the Sun is tilted relative to the ecliptic plane.
nssdc.gsfc.nasa.gov /planetary/factsheet/planetfact_notes.html   (1010 words)

  Orbital period - Wikipedia, the free encyclopedia
The draconitic period is the time that elapses between two passages of the object at its ascending node, the point of its orbit where it crosses the ecliptic from the southern to the northern hemisphere.
The anomalistic period is the time that elapses between two passages of the object at its perihelion, the point of its closest approach to the Sun.
Note that the orbital period is independent of size: for a scale model it would be the same, when densities are the same (see also Orbit#Scaling in gravity).
en.wikipedia.org /wiki/Orbital_period   (796 words)

 Planetary orbit - Wikipedia, the free encyclopedia
First, he found that the orbits of the planets in our solar system are elliptical, not circular (or epicyclic), as had previously been believed, and that the sun is not located at the center of the orbits, but rather at one focus.
Second, he found that the orbital speed of each planet is not constant, as had previously been thought, but rather that the speed of the planet depends on the planet's distance from the sun.
For each planet, the cube of the planet's distance from the sun, measured in astronomical units (AU), is equal to the square of the planet's orbital period, measured in Earth years.
en.wikipedia.org /wiki/Orbit   (2710 words)

 Period - Wikipedia, the free encyclopedia
In a group, the period of an element a is the smallest integer n such that a
In physics, a period is an interval of time between the recurrence of phases in a vibration, etc. This general sense applies to many of the above.
Period is also the name of the final novel in Dennis Cooper's George Miles Cycle.
en.wikipedia.org /wiki/Period   (162 words)

 orbital period
The orbital period of a planet is its "year".
For a body in an elliptical orbit of semimajor axis a about a much more massive body of mass M the orbital period P is given by
This is the mathematical formulation of the third of Kepler's laws of planetary motion.
www.daviddarling.info /encyclopedia/O/orbper.html   (122 words)

 6.3 Orbital period modulation
A modulation of the orbital period in close binaries with cool active components is a phenomenon which is suggested to be associated with magnetic activity cycles (Hall, 1989).
The relationship between the orbital period modulation and the starspot cycle is not yet clear.
If the cyclic origin of the orbital period modulation and its relation to the spot cycle is confirmed, this can be used as a proxy for magnetic cycles in Algols and cataclysmic variables where photometric modulation of the cool secondary is difficult to detect.
solarphysics.livingreviews.org /Articles/lrsp-2005-8/articlesu28.html   (280 words)

 Orbital period - Definition, explanation
The synodic period is the time that it takes for the object to reappear at the same spot in the sky, relative to the Sun, as observed from Earth.
The draconitic period is the time that elapses between two passages of the object at its ascending node, the point of its orbit where it crosses the ecliptic from the southern to the northern hemisphere.
The anomalistic period is the time that elapses between two passages of the object at its perihelion, the point of its closest approach to the Sun.
www.calsky.com /lexikon/en/txt/o/or/orbital_period.php   (771 words)

 NRL - Timing Studies of X-ray Binary Orbits
The solid line is the best-fit model with constant period derivative, and the dotted line is a model with a sudden change in orbital period.
This corresponds to an orbital period evolution timescale of about 40 million years, whereas the timescale expected from the amount of mass moving around the system is more like a billion years.
This jitter may correspond to very large changes in the orbital angular momentum over very short timescales, much too short to be explained by changes in the rate at which the companion is losing mass.
www.nrl.navy.mil /content.php?P=03REVIEW79-6   (860 words)

 Rotation Period and Day Length
As a result, the rotation period of a planet which has a retrograde rotation is a negative number, as shown in the table for the three planets which have such a rotation.
To explain why the day length, or synodic period of rotation, is different from the sidereal period of rotation, we consider how a given place moves around a planet, and the way in which this changes its view of the sky, during one rotation period.
For the second method, we divide the rotation period by the number of days in a year, and obtain 2 minutes 12.58 seconds as the difference between the rotation period and the length of the day, so that the day length would be 24 hours 39 minutes 35.24 seconds.
cseligman.com /text/sky/rotationvsday.htm   (2763 words)

 [No title]   (Site not responding. Last check: 2007-11-02)
The first period is characterized by a preoccupation with calculating the collision probability of catalogued objects with relatively large spacecraft.
It was during this period that the orbital debris hazard was compared to the meteoroid hazard.
This may have resulted from the fact that these studies were conducted by specialists in orbital dynamics; their main emphasis was to understand collision probability rather than other key elements, such as satellite breakups, detection of small debris, the consequences of hypervelocity collisions, and debris management.
webpages.charter.net /dkessler/files/HISTORY.TXT   (7686 words)

 Orbital period
The orbital period is the time it takes a planet (or another object) to make one full orbit.
The sidereal period is the time that it takes an object to make one full orbit, relative to the stars.
The synodic period is the time that it takes for an object to make one full orbit, relative to the sun (as observed from Earth).
www.mik.fastload.org /or/Orbital_period.html   (246 words)

 Table of Orbital Data for the Planets
Negative values of rotation period indicate that the planet rotates in the direction opposite to that in which it orbits the Sun.
The semimajor axis (the average distance to the Sun) is given in units of the Earth's average distance to the Sun, which is called an AU.
Orbital periods are also given in units of the Earth's orbital period, which is a year.
www.windows.ucar.edu /tour/link=/the_universe/uts/orbits_data.html&edu=elem   (195 words)

 Deep Impact: Science: Tempel 1 - Orbital History   (Site not responding. Last check: 2007-11-02)
The following table shows the evolution of the comet's perihelion distance and orbital period as a result of various passages by Jupiter for a few hundred years in the past and future.
Comet 9P/Tempel 1 was the first discovery of a periodic comet by Ernst Wilhelm Leberecht Tempel and the 9th periodic comet to be recognized as such.
Because the orbital period of comet 9P/Tempel 1 is roughly one half that of Jupiter, the comet's orbit is in a so-called 2:1 resonance with Jupiter and hence its motion is rather stable, without wide variations in its orbital evolution.
deepimpact.umd.edu /science/tempel1-orbitalhist.html   (723 words)

Dispersions of the orbital period can lead to a wide range of possible dates for Penetrator landings from 7 to 28 days after arrival because all orbital maneuvers must be visible from the ground tracking stations (Evpatoria and Ussurijsk).
Under certain dispersions of the initial orbital, the time required to fulfil all maneuvers may extend to the beginning of dust storm period.
Six orbital corrections (low thrust propulsion) are reserved for maintaining orbital period control during this period, requiring an expected V of 45 m/s.
www.iki.rssi.ru /mars96/03_mars_e.htm   (2230 words)

 Orbital Period Variability in PSR B1957+20: Evidence for a Tidally Powered Star   (Site not responding. Last check: 2007-11-02)
Recent observations indicate that the eclipsing pulsar binary PSR B1957+20 undergoes alternating epochs of orbital period increase and decrease.
We apply a model developed to explain orbital period changes of alternating sign in other close binaries to the PSR B1957+20 system and find that it fits the pulsar observations well.
We propose that the progenitor system had a $\simeq 2$ hr orbital period and a companion mass of $0.1 - 0.2\>M_\odot$, and the system is evolving to longer orbital periods by mass and angular momentum loss on a time scale of $10^8$ years.
www.aas.org /publications/baas/v26n2/aas184/abs/S2102.html   (221 words)

 Orbital Velocity and Period Calculator   (Site not responding. Last check: 2007-11-02)
To remain in a stable orbit, and not fall back to earth, the satellite has to move at a specific speed determined by its distance from the earth.
The period of a satellite is how long it takes to complete one circuit (called a revolution or "rev") around the earth.
The average distance of the moon from the earth is 384,400 km.
liftoff.msfc.nasa.gov /academy/rocket_sci/orbmech/vel_calc.html   (338 words)

Orbital Trajectories of Vulcan And Its Induced Comet Swarms.
Vulcan's New Orbital Parameters estimates Vulcan's period to be 4,969 years (with a comet swarm period 3,313 years).
Thus, the mean value and sigma error in the derivation of Vulcan's orbit period by computing individual comet swarm periods is about the same as fitting the comet impact data to a 4969 year (3313 year comet swarm) period.
www.barry.warmkessel.com /barry/TOIdelta.html   (3720 words)

 Johannes Kepler: The Laws of Planetary Motion
In this equation P represents the period of revolution for a planet and R represents the length of its semimajor axis.
The periods for the two planets are assumed to be in the same time units and the lengths of the semimajor axes for the two planets are assumed to be in the same distance units.
Kepler's Third Law implies that the period for a planet to orbit the Sun increases rapidly with the radius of its orbit.
csep10.phys.utk.edu /astr161/lect/history/kepler.html   (1409 words)

 Orbit Simulator   (Site not responding. Last check: 2007-11-02)
The square of a body's orbital period is proportional to the cube of the semimajor axis of its orbit.
Well, the orbital period is the time it takes for an object (like a planet or a satellite) to complete one orbit.
When the orbital period of the satellite is the same as a sidereal day (23 hours, 56 minutes, 4 seconds), the satellite orbits at the same rate at which the earth turns below.
observe.arc.nasa.gov /nasa/education/referance/orbits/orbit_sim.old.html   (265 words)

 Orbital Motion   (Site not responding. Last check: 2007-11-02)
Use a spreadsheet to plot a graph of the orbital period of a satellite as a function of its height above the earth's surface to a distance of 50,000 km from the earth's centre.
Given that Earth's orbital period is 365.25 days, calculate a value for the mass of the Sun.
First of all he calculated a value for this based on the moon's orbital period and the average centre-to-centre distance between it and the earth.
www.emanuel.org.uk /curriculum/science/physics/website/alevel/aprobs/gravity/grav2.htm   (884 words)

 ATEL # 767: Orbital Period of Swift J0732.5-1331
The variations are periodic; a least-squares sine fit gives 0.2335(8) d and a semiamplitude K = 150(7) km/s, with an rms scatter of 17 km/s.
The period choice is unambiguous; the best alternative period at 0.1895 d (corresponding to a different choice of the daily cycle count) gives a significantly worse fit, and a Monte Carlo simulation indicates that it has a negligible likelihood of being the true period.
The orbital period found here is similar to other members of this class and supports this interpretation.
integral.rssi.ru /atelmirror/index.cgi/?read=767   (315 words)

 Orbital Mechanics I
The orbital speed of the planets decreases with distance from the sun [magnify].
The orbital speed of the stars remains roughly constant with distance from the center of the Milky Way [magnify].
Dwarf galaxies, star clusters, and gas clouds beyond the edge of the visible galaxy have nearly the same orbital speed as the stars within visible galaxy.There is evidence that rotational speeds remain roughly constant at 220 km/s out to distances of 300,000 light years or six times the radius of the Milky Way.
hypertextbook.com /physics/mechanics/orbital-mechanics-1   (3199 words)

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