Period
In astronomy, the term period usually refers to how long an object takes to complete one cycle of revolution. In particular the orbital period of a star or planet is the time it takes to return to the same place in the orbit.
Long period variable
A long period variable is a type of variable star in which variations in brightness occur over long timescales of months or years.
axial period
The time taken for an object to make one complete rotation on its axis. The axial period of a planet is its "day".
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Synodic Period
Related Category: Astronomy: General
(snd´k), in astronomy, length of time during which a body in the solar system makes one orbit of the sun relative to the earth, i.e., returns to the same elongation.
Synodic Period
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SYNODIC PERIOD, in astronomy, the apparent period of a planet or satellite when its revolution is referred to the line passing through the earth or the sun.
synodic period
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Synodic Period
The time a body in the solar system takes to orbit another body once and return to the same orbital relationship.
Orbital Period
Using data from an observation of and one of , determine their oribtal periods.
Stellar Rotation Period ...
Sidereal Period versus Synodic Period
Measuring the motion of the Moon around the Earth relative to the distant stars leads us to what is called the sidereal period.
The synodic period is the time it takes for a celestial body in the solar system to complete a return to an appearance it started from, as it is seen from an observer such as the Earth and is affected by a third body such as the Sun.
Check out the table of orbital data for the planets. You will notice that Venus' orbital period (P) is longer than Mercury's, and the Earth's period is longer than Venus', and Mars' period is longer than Earth's...
Definition: orbital period: The time required for an object to make a complete revolution along its orbit.
Space Tragedies9 Planets in Nine DaysAstronomy 101
Related Articles ...
period-luminosity relation A relation between the pulsation period of a Cepheid variable and its absolute brightness. Measurement of the pulsation period allows the distance of the star to be determined.
Periodization is the attempt to categorize or divide time into named blocks. The result is a descriptive abstraction that provides a useful handle on periods of time with relatively stable characteristics....
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Periodic comets
The nucleus of comet Halley as seen by the Giotto space probe. Image: ESA/MPAE Many periodic comets are known with orbits that lie inside the planetary system. Halley's comet is one of these.
Periods and Orbits.
Comets have elliptical orbits, and the periods of about 200 comets-the time they take to orbit the sun once-have been calculated. They range from 3.
periodic comet
a comet that has been seen to orbit the sun more than once (Comet Halley was the first recognized as periodic)
phase ...
PERIOD - Horizontal row in the periodic table of the elements. Whereas groups are characterized by the number of electrons present in the outer shell, ...
Periodic comets were once believed to have started as non-returning ones but to have been diverted by the pull of one of the larger planets. They are now widely held to arrive from the Kuiper belt as a class of objects known as Centaurs.
Period Doubling
the motion of a particle under the influence of a force may settle down to a regular orbit with a definite period.
Periodic time- (see sidereal period)
Perturb- to cause a planet or satellite to deviate from a theoretically regular orbital motion ...
period-luminosity relationship
The predictable relation between the pulsation period and changes in luminosity of a Cepheid variable star.
perturbation
Small deviances in the location of a star, visible through large telescopes.
Period-Luminosity Diagram
A graph showing the relation-between period of pulsation and intrinsic brightness among Cepheid variable stars.
Photometer ...
Periodic Error - An error in tracking that repeats with a regular period in an equatorial mount, usually the period of revolution of the worm gear.
Period. The interval between successive occurrences of a cyclical event.
Perturbations. The disturbances in the orbit of a celestial object produced by the gravitational effects of other bodies.
Period-luminosity Relationship - The relationship between the period of brightness variation and the luminosity of a Cepheid variable star. The longer the period of a Cepheid is, the more luminous the Cepheid ...
Period-Luminosity Relation for Variable Stars
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PERIOD OF REVOLUTION
The period of revolution of an orbiting body is the time it takes for it to make one revolution around its primary body. The period of revolution for the Earth is one year.
Long-Period Variables (LPVs)
The first pulsating variable discovered was the long-period variable Mira. They are cool red giants or supergiants and have periods of months to years. Their luminosities can range from 10 to 10,000 × LSun.
Long-period: In astronomy, a comet with an orbital period greater than 200 years.
Binary Period (days)
Characteristics of X-rays
Characteristics of Visible Star/Companion ...
orbital periods (in asteroid (astronomy): Hungarias and outer-belt asteroids) ...
Archaic period
Main article: Archaic period in Greece
In the 8th century BC, Greece began to emerge from the Dark Ages which followed the fall of the Mycenaean civilization.
Synodic period The period of a planet's orbit with respect to the Earth.
Transit The passage of Mercury or Venus in front of the Sun's disc or the passage of a satellite or its shadow across the face of its primary.
Orbital Period
the amount of time it takes a spacecraft or other object to travel once around it's orbit.
P
Paleozoic
a geological term denoting the time in Earth history between 570 and 245 million years ago.
Periodic comets are also numbered in order of discovery.
Examples
1P/Halley was the first comet shown to be periodic.
C/1995 O1 Hale-Bopp was the first comet discovered in the second half of July (O1) in 1995.
Periodic Comet
A comet in a closed, elliptical orbit within our solar system. These comets typically have orbital periods of less than 200 years.
Periodic comets Those with short orbit durations Nucleus
Main body of the comet, composed of dust particles trapped in a mixture of ices of water, carbon monoxide, carbon dioxide, methane, and ammonia. Typically only a few kilometers in diameter.
Periodic table of the elements...
Atomic Weight Synonym for atomic mass. Atomic weight is the relative mass of an atom of the given element compared to the mass of carbon-12.
More about atomic weight...
Periodic expansion and contraction of a star that may be merely an optical effect of recession. [A84]
Radial Velocity ...
Periodic waves are characterized by crests (highs) and troughs (lows), and may usually be categorized as either longitudinal or transverse.
Period between new moons. 29 days 12 hours 44 minutes.
Magnetosphere
Region around an object where the influence of the objects magnetic field can be felt.
Period-Luminosity Law
A relationship that describes how the luminosity or absolute brightness of a Cepheid variable star depends on the period of time over which that brightness varies.
Photometer ...
periodic table - (n.)
A systematic arrangement of the elements in columns and rows; elements in a given column have similar properties.
photomultiplier - (n.) ...
Period-Luminosity Relation: A relationship between the pulsation period of a variable star (e.g. a Cepheid) and its luminosity (or absolute magnitude). Generally the more luminous the star the longer the pulsation period.
(period)2 = (constant) x (average distance)3
The constant in this equation is the same for any objects orbiting around the Sun, including planets, comets and artificial satellites.
a period of 19 days, 7 hours;
a mean distance from Sun of 0.1427 AU;
an inclination of 12° 10'; and,
an ascending node at 12° 59'.
a period of enhanced meteor activity that occurs when Earth collides with a swarm of meteoroids; an individual shower happens at the same time each year and has all its meteors appearing to radiate from a common point
meteorite ...
The period for Mira averages about 331 days according to Burnham. At its brightest Mira typical appears at a visual of about 3.5, but the brightness at both maximum and minimum fluctuates. Mira might be seen as bright as magnitude 2.5 at maximum.
The periods of the pulsation modes depend intimately on the global structure of a pulsating star and can be used to infer the internal structure of that star, a technique known as asteroseismology.
The periodic table of elements
The creation of different atomic nuclei in stars
The lifecycle of stars; white dwarves, neutron stars, black holes,
The end of the Sun and of Earth, supernovae, red giants, pulsars
Radioactivity and cosmic rays ...
The Period-Luminosity relation for Cepheid variables has been revised many times since Henrietta Leavitt's first measurements. Today the best estimate of the relation is:
M = "2.78 log (P) " 1.35 ...
The period of totality ends when the motion of the Moon begins to uncover the surface of the Sun, and the eclipse proceeds through partial phases for approximately an hour until the Sun is once again completely uncovered.
The period during which nuclei and electrons combined to form atoms is often called the epoch of decoupling, for it was during this period that the radiation background parted company with normal matter.
Each period of weightlessness occurs during a parabola. The plane flies up toward the sky and then down toward the ground, like the up-and-down pattern on a roller coaster. During each flight the plane does between 30 and 60 parabolas.
Long-period, Oort-Cloud
comets may have formed
even closer to the Sun
than Edgeworth-Kuiper Belt
comets like Halley's.
LONG PERIOD COMET
A long period has an orbital period over 200 years. This type of comet may originate from the .
QUIET PERIOD - Few, if any sunspots are seen, the corona is difficult to observe, and our Sun looks black when viewed with an X-ray telescope because few X-rays are being produced. Right now, our Sun is in a relatively quiet period.
Synodic Period
The interval between points of opposition of a superior planet.
T
Tektite
A small, glassy material formed by the impact of a large body, usually a meteor or asteroid. Tektites are commonly found at the sites of meteor craters.
Cambrian period
A geological period 0.6-0.5 billion years ago during which life on Earth became diverse and complex.Cambrian rocks caontain the oldest easily identifiable fossiles.
celestial equator ...
 See also: Time, Earth, Light, Second, Sun
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