Parsec
Related Category: Astronomy: General
(pär´sc) [parallax + second], in astronomy, basic unit of length for measuring interstellar and intergalactic distances, equal to 206,265 times the distance from the earth to the sun, ...
Parsec
Distances to the closest stars can be determined through measurement of their trigonometric parallax. The parsec was defined to be the distance at which 1 AU (perpendicular to the line of sight) subtends an angle of 1 arcsecond: ...
Parsec
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parsec
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Parsec:
A parsec is the unit for expressing distances to stars and galaxies, used by professional astronomers.
Parsec
A parsec is defined as the distance from the which would result in a parallax of 1 second of arc as seen from ,
where ly is a . The word "parsec" is an abbreviation and contraction of the phrase "parallax second." ...
Definition: parsec: = 206265 AU = 3.26 light year
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The use of the parsec has been carried into the 21st Century because of historical inertia and because its use avoids the application of conversion factors -- i.e., 3.
Parsec (pc)
Astronomers use another unit of distance called a parsec (pc), which is equal to 3.26 light-years. The definition of the parsec is based on a triangle.
PARSEC (pc) - Unit of distance commonly used by astronomers. A star one parsec away has a parallax angle of one second of arc. A star with a parallax shift of 0.1 arcseconds is at a distance of 10 parsecs, and so forth.
Parsec is another very common distance unit in astronomy. Since the Earth keeps on orbiting around the Sun, a not-very-distant star will seem to move with respect to the very far away background stars. This phenomenon is called parallax.
parsec The distance at which a star must lie in order that its measured parallax is exactly 1 arc second, equal to 206,000 A.U.
parsec
the distance an object would have to be from Earth so that its parallax when viewed from two points separated by 1 AU would be one arcsecond; equal to 3.26 light-years.
patera ...
Parsec
(a) The distance at which one astronomical unit subtends an angle of one second of arc; equivalently, the distance to an object having an annual parallax of one second of arc. (abbreviation for parallax second) ...
Parsec: A unit of distance equal to about 3.26 light-years (or, more precisely, equal to 206,265 Astronomical Units).
Parsec A unit of distance used by astronomers which is equal to 3.26 light years. A parsec is defined as the distance to a celestial body whose parallax is one arc second.
Parsec: A unit of length approximately equal to 3.26 light-years, or nineteen trillion miles.
Peculiar Galaxy: A galaxy that has distorted features and does not fit completely into a normal galaxy category.
Parsec The distance at which a star would have a parallax of one arcsecond. (3.2616 light years, 206,265 astronomical units, 30.857 x 10^12 km).
parsec
A unit of distance used in astronomy which is equivalent to 3.26 light years, or more than 30 trillion kilometres.
partial eclipse
An eclipse as seen in the penumbral shadow where the eclipsed object is not completely covered.
Parsec
A hypothetical distance to a star whose parallax is one arcsecond; 1pc = 206,265 A.U. = 3.26 ly.
Partial Eclipse (lunar or Solar) ...
Parsec
a large distance often used in astronomy. A parsec is equal to 3.26 light years.
Patera
shallow crater; scalloped, complex edge.
Parsec [pc]: A unit of astronomical distance equal to 3.26 light years, or 206265 AU, which equals 3.08 x 1013 kilometers.
Parsec (pc). Parallax second. The distance at which one astronomical unit subtends an angle of one arcsecond. One parsec is equal to 3.26 light years, or 206 265 astronomical units, or 30.86 million million kilometres.
parsec (pc): The distance to a hypothetical star whose parallax is 1 second of arc; 1 pc = 206,265 AU = 3.26 ly.
Parsec (From PARallax + SECond). A unit of distance between stars. A star would be one parsec from Earth if its (stellar) parallax (see above) were 1 second of arc. One parsec is about 3 1/4 light years.
PARSEC
A parsec is a unit of distance that is equal to 3.26 light-years or 3.085678 x1013kilometers. It is the distance at which a star would have a parallax of 1 second of arc.
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The Parsec
The closer a star is to us, the larger its angle of parallax will be. Astronomers have defined a standard unit of distance to be the parsec (pc).
KILOPARSEC
1000 parsecs. A parsec equals 3.26 light years.
L
LIGHT YEAR
The distance light can travel in one year, which is 9,500,000,000,000 kilometers.
kiloparsec
A distance equal to 1000 parsecs.
kinematics
Refers to the calculation or description of the underlying mechanics of motion of an astronomical object.
parsec
Astronomy
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Parsec (PC)
A useful unit for measuring the distances between astronomical objects, equal to 3.26 light-years and 3.085678 * 1013 kilometers, or approximately 18 trillion miles. A parsec is also equivalent to 103,132 trips to the Sun and back.
parsec
the apparent shift of a relatively nearby object against a fixed background due to the motion of the observer; astronomers observe the parallax of stars to measure their distances
penumbra ...
parsec (pc) - (n.)
parallax second, the distance at which I AU subtends an angle of 1second of arc: 1 parsec = 1.9x1013 mi. = 3.26 light years.
peculiar velocity - (n.) ...
Parsec: A unit of distance used to describe the vast scales of the cosmos, the parsec is equal to about 3.262 lightyears, or 3.09 × 1016 meters. A star that is one parsec away would produce a parallax angle of one second of arc.
Parsec - The distance at which a star has a parallax of 1 second of arc. At a distance of 1 parsec (pc), an AU fills an angle of one second of arc
Patera - A type of Martian volcano that resembles shield volcanos, but has even more gentle slopes ...
kiloparsec
A unit of distance equivalent to 1000 parsec or 32600 light-years.
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MEGAPARSEC
A megaparsec (Mpc) is a unit of distance that is equal to one million , 3.26 x 106 light-years or 3.085678 x1019 kilometers. The of galaxies is roughly a megaparsec in diameter.
1. One parsec is a little over 200,000 A.U. (Hint)
2. There are no stars within 1 pc of the Sun. (Hint)
3. Parallax can be used to measure stellar distances out to about 1000 pc. (Hint) ...
megaparsec (NASA SP-7, 1965) One million parsecs. See parsec. mel (NASA SP-7, 1965) A unit of acoustic pitch.
parsec (pc): distance at which an object would have a parallax of one arc second. Equals approximately 3.26 light years or about 206,265 astronomical units.
The unit of speed in astronomy. One kilometer per second is 2237 miles per hour - five times the speed of an airplane. [C95]
kiloparsec
A measure of distance equal to 1,000 parsecs, or about 3,000 light years. [LB90]
kinematic relativity ...
palus literally "swamp"; really a small plain parsec = 206265 AU = 3.26 light year patera shallow crater; scalloped, complex edge. penumbra literally, "dim light"; the outer filamentary region of a sunspot.
This list of the nearest stars to Earth is ordered by increasing distance out to a maximum of 5 parsecs (16.3 light years). Stars with an apparent magnitude greater than 6.
The burst is often confined to a few hundred parsecs near the nucleus, although disk-wide bursts are common.
The largest radio galaxies have lobes or plumes extending to megaparsec scales, implying a timescale for growth of the order of tens to hundreds of millions of years.
Distances in space are often measured in light-years and parsecs. A light-year is A unit of length used by astronomers to measure distance. One light-year is equal to the distance light travels in one year, which is about 5.
d (distance) will be in units of Parsecs, and p is of course in arc seconds (small fractions of a degree, whose symbol is ").
He found that the nearby star 61 Cygni was at a distance of about 3 parsecs, or about 600,000 times the distance from the earth to the sun.
Absolute magnitude, however, is the brightness of a star supposing that it was located exactly 10 parsecs (about 32.6 light years) away from Earth.
In astronomy, we have a unit specifically geared to this method: the parsec. This unit of measure is the distance of a star that moves by one arc second against the background when the observer moves by one Astronomical Unit.
3 parsecs) from Earth, relatively close in astronomical terms. From this satellite's observations, Arcturus is now known to be slightly variable, by about 0.04 magnitudes over 8.3 days.
3066 parsecs, where the parsec equals 206,265 AU, 3.2616 light years). Unless a star is too far away, or is determined by other more precise means, its distance is taken from the Hipparcos parallax catalogue, using the second reduction after July 1, ...
Hubble's first determination of it was a value of 550 kilometers per second for every megaparsec in distance (km/sec/Mpc). Today, it is generally believed to be around 65 km/sec/Mpc. (A megaparsec is given by 1 Mpc = 3 x 106 light-years).
(In November I'll tell you how astronomers measure distances and that is when I will teach you about another unit of measurement used in astronomy called the parsec.) Although these distances are huge, ...
expanded the Universe to unimaginable scales, just as Hubble has done before him, and this resulted in a more accurate assessment of Hubble's Constant, which is the measure of the expansion of the Universe, of 75 kilometres per second per megaparsec ...
The Hubble constant had previously been found to be 72, give or take 8, kilometers per second per megaparsec based on Hubble Space Telescope observations.
The absolute magnitude is the magnitude the stars would have if viewed from a distance of 10 parsecs or some 32.6 light years. Obviously, Deneb is intrinsically very bright to make this list from its greater distance.
Astronomers "pretend" to line up stars exactly 10 parsecs (about 32.6 light years) away from Earth. They then figure out how bright each star would look. They call that brightness the star's absolute magnitude.
CALCULATORS AND CHARTS Convert Fahrenheit to Celsius, or parsecs to light years. Our conversion calculators translate figures for temperature, speed, distance, weight and redshift.
After things have quieted down this remnant continues to expand and can grow in size to between 10 and 100 parsecs. It is after all moving at speeds of around 100 km/sec, which gives a size of 20 pc after only 100,000 years.
 See also: Light, Distance, Star, Earth, Sun
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