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Astronomical concept
In astronomy, angular diameter distance is a distance (in units of length) defined in terms of an object's physical size (also in units of length), x
Angular_diameter_distance
How large a sphere or circle appears
The angular diameter, angular width, angular size, apparent diameter, or apparent size is an angular separation (in units of angle) describing how large
Angular_diameter
Cosmological formulas for expanding universe
_{k}<0\end{cases}}} Angular diameter distance: d A ( z ) = d M ( z ) 1 + z {\displaystyle d_{A}(z)={\frac {d_{M}(z)}{1+z}}} Luminosity distance: d L ( z ) =
Distance_measure
Ability of any image-forming device to distinguish small details of an object
to have a high resolution or high angular resolution, it means that the perceived distance, or actual angular distance, between resolved neighboring objects
Angular_resolution
Angle between the two sightlines or two objects as viewed from an observer
Angular distance or angular separation is the measure of the angle between the orientation of two straight lines, rays, or vectors – typically in three-dimensional
Angular_distance
Topics referred to by the same term
sphere or circle appears from a given point of view Angular diameter distance, used in astronomy Angular Recording Corporation, a British independent record
Angular
Astronomical object of known size
measuring the distance between source and observer. The distance measured by a standard ruler is known as the angular diameter distance. Standard candles
Standard_ruler
Etherington distance-duality equation is the relationship between the luminosity distance of standard candles and the angular diameter distance. The equation
Etherington's reciprocity theorem
Etherington's_reciprocity_theorem
Cosmological fine-tuning problem
approximate angular diameter of the universe and the physical size of the particle horizon that had existed at this time. The angular diameter distance, in terms
Horizon_problem
Astronomical measurement in mathematics
transverse distance" D M {\displaystyle D_{M}} by D L = ( 1 + z ) D M {\displaystyle D_{L}=(1+z)D_{M}} and with the angular diameter distance D A {\displaystyle
Luminosity_distance
High-redshift galaxy in the constellation Ursa Major
that its angular diameter distance is actually less than that of some galaxies with lower redshift. This means that the ratio of its angular size (how
GN-z11
Fluctuations in the density of the normal matter of the universe
measurements of the Hubble parameter and angular diameter distance, respectively. The angular diameter distance and Hubble parameter can include different
Baryon_acoustic_oscillations
Feature seen when light is gravitationally lensed by an object
{\displaystyle D_{L}} is the angular diameter distance to the lens, D S {\displaystyle D_{S}} is the angular diameter distance to the source, and D L S {\displaystyle
Einstein_ring
Topics referred to by the same term
related to the diameter of circles and sets include: Angular diameter, how large a circle or sphere appears in a field of view Diameter (computational
Diameter_(disambiguation)
Cosmological time duration
February 2008. Retrieved 23 February 2008. Hu, W. "Animation: Angular diameter distance scaling with curvature and lambda". University of Chicago. Archived
Age_of_the_universe
Qualifier for the rated speed of an optical disc drive
In optical storage, constant angular velocity (CAV) is a qualifier for the rated speed of any disc containing information, and may also be applied to
Constant_angular_velocity
SI derived unit of angle
in the International System of Units (SI) and is the standard unit of angular measure used in many areas of mathematics. It is defined such that one
Radian
Process of enlarging the apparent size of something
apparent (angular) size as seen via instrument and the angular size of the object when the object is placed at the conventional closest distance of distinct
Magnification
Brightness of a celestial object observed from the Earth
bandpass, and interfering light from scattering and airglow. Angular diameter Distance modulus List of nearest bright stars List of nearest stars Luminosity
Apparent_magnitude
Cosmological phenomenon
looking at the distances at which galaxies at different redshifts tend to cluster, it is possible to determine a standard angular diameter distance and use that
Accelerating expansion of the universe
Accelerating_expansion_of_the_universe
Spectral distortion of cosmic microwave background in galaxy clusters
data can also be used to determine the Hubble constant using the angular diameter distance of the cluster. These thermal distortions can also be measured
Sunyaev–Zeldovich_effect
Conserved physical quantity; rotational analogue of linear momentum
the disk's radius. If instead the disk rotates about its diameter (e.g. coin toss), its angular momentum L {\displaystyle L} is given by L = 1 2 π M f r
Angular_momentum
Red supergiant star in the constellation Orion
50–60 mas. Assuming a distance of 197 pc, this means a stellar diameter of 887±203 R☉. Once considered as having the largest angular diameter of any star in
Betelgeuse
Distance from center of Earth to center of Moon
Earth's diameter; to cover the same distance on earth would take a non-stop airplane flight more than two weeks. Around 389 lunar distances make up an
Lunar_distance
Comparison of a wide range of lengths
the red supergiant Betelgeuse based on multiple angular diameter estimates 1.032 Tm – 6.9 au – diameter of the blue hypergiant Eta Carinae (at optical
Orders_of_magnitude_(length)
High-altitude balloon package measuring the universe's geometry
others, the BOOMERanG data from 1997 and 1998 determined the angular diameter distance to the surface of last scattering with high precision. When combined
BOOMERanG_experiment
Width of an electromagnetic beam
can also refer to the angular diameter (i.e., angular width), which is the angle subtended by the beam at the source. The angular width is also called
Beam_diameter
Units for measuring angles
describe small astronomical angles such as the angular diameters of planets (e.g. the angular diameter of Venus which varies between 10″ and 60″); the
Minute_and_second_of_arc
Extraterrestrial view of outer space
from Earth. The change in angular diameter of the Sun with distance is illustrated in the diagram below: The angular diameter of a circle whose plane is
Extraterrestrial_sky
Displacement measured angle-wise when a body is showing circular or rotational motion
infinitesimal rotations are applied is irrelevant. Angular distance Angular frequency Angular position Angular velocity Azimuth Rotation matrix § Infinitesimal
Angular_displacement
Concept in physics
{\displaystyle D_{d}~} is the distance from the observer to the lens. For extragalactic lenses, these must be angular diameter distances. In strong gravitational
Gravitational lensing formalism
Gravitational_lensing_formalism
Qualifier for the rated speed of an optical disc drive
times the angular (rotation) speed of the disc compared to at the outer edge (6 cm from disc center). For a miniature disc with a diameter of 8 cm (radius
Constant_linear_velocity
Technique in stellar astrophysics
Combining this with the change in angular diameter gives the distance. It is now possible to measure the angular diameter of the pulsating star directly
Baade-Wesselink_method
Unit of length in astronomy
that a parsec is also the distance from which a disc that is one au in diameter must be viewed for it to have an angular diameter of one arcsecond (by placing
Parsec
Star in the constellation Dorado
350±520 L☉. The measured angular diameter, again assuming a distance of 55 pc gives a radius of 298±21 R☉. The angular diameter and bolometric flux of R
R_Doradus
Angular measurement, thousandth of a radian
mrad is an angular measurement, the subtension covered by a given angle (angular distance or angular diameter) increases with viewing distance to the target
Milliradian
Project to measure the expansion of the universe
likelihoods derived from angular correlations and spherical harmonics to constrain the ratio of comoving angular diameter distance D m ( Z eff = 0.835 )
Dark_Energy_Survey
System of stars and interstellar matter
its estimated distance, leading to an angular diameter (also called "metric diameter"). The isophotal diameter is introduced as a conventional way of
Galaxy
Quasar in the constellation Aquarius
comoving coordinate distance of PKS 2131−021 is 3.97 Gpc, with an angular diameter distance of 1.74 Gpc, and luminosity distance of 9.08 Gpc. Observations
PKS_2131−021
Red supergiant star in the constellation Cepheus
based on its angular diameter and an assumed distance of 2,400 light years gives it a radius of 1,650 R☉, however the angular diameter used later turned
Mu_Cephei
Star in the constellation Scorpius
Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the
Upsilon_Scorpii
Galaxy in the constellation Hercules
Henkel, C. (2013-04-08). "THE MEGAMASER COSMOLOGY PROJECT. V. AN ANGULAR-DIAMETER DISTANCE TO NGC 6264 AT 140 Mpc". The Astrophysical Journal. 767 (2): 155
NGC_6264
Perceived variation in the Moon's size
5% farther away and thus smaller in angular size when at the horizon than when above. The angle that the diameter of the full Moon subtends at an observer's
Moon_illusion
Star in the constellation Orion
Prevot-Burnichon, M.-L.; Doazan, V. (1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars". Monthly Notices of the
Upsilon_Orionis
The Moon's circuit around Earth
barycentre of 1.022 km/s (2,290 mph), the Moon covers a distance of approximately its diameter, or about half a degree on the celestial sphere, each hour
Orbit_of_the_Moon
Galaxy in the constellation Centaurus
the distance of 200.6 megaparsecs (654 million light-years) from Earth, and is possibly a member of the larger Shapley Supercluster. With a diameter of
ESO_383-76
Figure formed by two rays meeting at a common point
"The Moon's diameter subtends an angle of half a degree." The small-angle formula can convert such an angular measurement into a distance/size ratio.
Angle
Work by Aristarchus of Samos, Greek astronomer
parallax. Aristarchus also reasoned that as the angular size of the Sun and the Moon were the same, but the distance to the Sun was between 18 and 20 times further
On the Sizes and Distances (Aristarchus)
On_the_Sizes_and_Distances_(Aristarchus)
Large self-illuminated object in space
size is R Doradus, with an angular diameter of only 0.057 arcseconds. The disks of most stars are much too small in angular size to be observed with current
Star
Star in the constellation Cassiopeia
angular diameter of α Cassiopeiae in arcseconds, d S {\displaystyle {d_{S}}} the star's diameter in AU, and D S {\displaystyle {D_{S}}} the Distance from
Alpha_Cassiopeiae
Blue supergiant star in the constellation Canis Major
Underhill, A. B.; et al. (November 1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars". Monthly Notices of the
Eta_Canis_Majoris
Gravitational deflection of light
due to the differences in instruments and observing conditions. Angular diameter distances to the lenses and background sources are important for converting
Weak_gravitational_lensing
Segment in a circle or sphere from its center to its perimeter or surface
direction. The distance from the axis may be called the radial distance or radius, while the angular coordinate is sometimes referred to as the angular position
Radius
The diameters given for this object in this list was based on NED's provided scale "Virgo + GA + Shapley" multiplied with the values for the angular diameter
List_of_largest_galaxies
Monochrome light beam whose amplitude envelope is a Gaussian function
increase its peak intensity at large distances) it must have a large cross-section (w0) at the waist (and thus a large diameter where it is launched, since w(z)
Gaussian_beam
Succession of methods by which astronomers determine the distances to celestial objects
related to a galaxy's distance. The Sigma-D relation (or Σ-D relation), used in elliptical galaxies, relates the angular diameter (D) of the galaxy to
Cosmic_distance_ladder
Scalar measure of the rotational inertia with respect to a fixed axis of rotation
The moment of inertia (also known as mass moment of inertia, angular/rotational mass, second moment of mass, or rotational inertia) is a measure of how
Moment_of_inertia
magnetic fields of stars List of directly imaged exoplanets Angular resolution Angular diameter List of nearest stars Published 2024 based on observations
List of stars with resolved images
List_of_stars_with_resolved_images
Star in the constellation Taurus
naked eye under good observing conditions. A semiregular variable, its angular diameter has been measured at about 10 mas. It is a similar star to Betelgeuse
119_Tauri
Clarity of vision
research environments, in dome theaters, and in virtual-reality headsets. Angular diameter Dioptre Eye examination Fovea centralis Golovin–Sivtsev table, for
Visual_acuity
exponent Angular Momentum Commutator Angular acceleration Angular diameter distance Angular displacement Angular frequency Angular momentum Angular momentum
Index_of_physics_articles_(A)
Greek astronomer and mathematician (c. 310 – 230 BC)
apparent angular sizes, and therefore their diameters must be in proportion to their distances from Earth. Similar attempts to estimate celestial distances were
Aristarchus_of_Samos
Angular distance between the Moon and another celestial body
navigation, lunar distance, also called a lunar, is the angular distance between the Moon and another celestial body. The lunar distances method uses this
Lunar_distance_(navigation)
Rotating circular machine part with teeth that mesh with another toothed part
based straight cogs. Operating pitch diameters Diameters determined from the number of teeth and the center distance at which gears operate. Example for
Gear
Ringed dwarf planet in the Kuiper belt
with a canoe, and is stylized to recall angular Tongva rock art. Quaoar orbits the Sun at an average distance of 43.7 AU (6.54 billion km; 4.06 billion mi)
Quaoar
an angular diameter of 7.8±0.64 milliarcseconds and a distance of 1610+130 −110 parsecs. Legend: UD=Uniform disk diameter LD=Limb-darkened diameter Ross=Rosseland
List_of_largest_stars
Light all pointing in the same direction
starlight arrives slightly uncollimated at the ground with an apparent angular diameter of about 0.4 arcseconds. Direct rays of light from the Sun arrive at
Collimated_beam
Laws describing planetary orbits
speed nor the angular speed of the planet in the orbit is constant, but the area speed (closely linked historically with the concept of angular momentum)
Kepler's laws of planetary motion
Kepler's_laws_of_planetary_motion
Binary star in the constellation Canis Major
Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the
Zeta_Canis_Majoris
Natural satellite orbiting Earth
the naked eye. Because the distance between the Moon and Earth is very slowly increasing over time, the angular diameter of the Moon is decreasing. As
Moon
Star in the constellation Orion
Underhill, A. B.; et al. (November 1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars". Monthly Notices of the
25_Orionis
Major astronomical facility in Chile
conditions has an angular resolution of 0.005 arcsecond which corresponds to separating two light sources 1 AU apart from 200 pc (650 ly) distance, or two light
Extremely_Large_Telescope
Star in the constellation of Andromeda
M. -L.; Doazan, V. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars.", Monthly Notices of
Iota_Andromedae
Star in the constellation Cassiopeia
Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the
1_Cassiopeiae
Shadow that Earth itself casts through its atmosphere and into outer space
above the horizon, most distinct when the sky is clear. Since the angular diameters of the Sun and the Moon as viewed from Earth's surface are almost
Earth's_shadow
Distance from the Earth surface to a point near its center
Earth radius (denoted as R🜨 or RE) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an
Earth_radius
Retrieved 2024-02-13. From trigonometry: radius = distance × sin( diameter_angle / 2 ) = 153 ly. "Angular Size calculator". 1728.org. Archived from the original
List_of_largest_star_clusters
Fluid flow revolving around an axis of rotation
distance r from the axis in many ways. There are two important special cases, however: If the fluid rotates like a rigid body–that is, if the angular
Vortex
Largest radio galaxy discovered
has a diameter of 48,700 light years (14.94 kiloparsecs) based on a distance of 5.94 billion light years (1,820 megaparsecs) and an angular diameter of 1
TXS_0033+252
Mean distance between Earth and the Sun
concluded that the apparent diameter of the Sun was equal to the apparent diameter of the Moon at the Moon's greatest distance, and from records of lunar
Astronomical_unit
Galaxy containing the Solar System
Galactic Center GeV excess Oort constants The distance towards its center (Sagittarius A*). This is the diameter measured using the D25 standard. It has been
Milky_Way
Largest dwarf planet
star-like and without a visible disk even in large telescopes, because its angular diameter is maximum 0.11". The earliest maps of Pluto, made in the late 1980s
Pluto
Diffraction pattern in optics
plane at distance f, the numerical aperture A is related to the commonly-cited f-number N= f/d (ratio of the focal length to the lens diameter) according
Airy_disk
Lens or mirror in optical instruments
telescope. A telescope's light-gathering power and angular resolution are both directly related to the diameter (or "aperture") of its objective lens or mirror
Objective_(optics)
How much a beam expands as it travels
especially in optics, beam divergence is an angular measure of the increase in beam diameter or radius with distance from the optical aperture or antenna aperture
Beam_divergence
Optical system with resolution performance at the instrument's theoretical limit
theoretically perfect, or ideal, optical system. The diffraction-limited angular resolution, in radians, of an instrument is proportional to the wavelength
Diffraction-limited_system
Astronomical term for luminosity per area
it is effectively a point source in most observations (the largest angular diameter, that of R Doradus, is 0.057 ± 0.005 arcsec), whereas a galaxy may
Surface_brightness
Star in the constellation Aquarius
Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the
Psi2_Aquarii
Nearest star to the Solar System
(VLTI) found that the angular diameter of Proxima Centauri is 1.02±0.08 mas. Because its distance is known, the actual diameter of Proxima Centauri can
Proxima_Centauri
Variable star in the constellation of Andromeda
Underhill, A. B.; et al. (November 1979). "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars". Monthly Notices of the
Omicron_Andromedae
Array used for astronomical observations
effect of a telescope the size of the distance between the apertures; this is only true in the limited sense of angular resolution. The amount of light gathered—and
Astronomical_interferometer
Angle an object subtends at the eye
apparent size refers to the physical angle V {\displaystyle V} or angular diameter. But in psychophysics and experimental psychology the adjective "apparent"
Visual_angle
When moons of Saturn pass before the Sun
this distance, the sun covers only about 3 arcminutes in the sky of Saturn. In comparison, the seven major moons of Saturn have angular diameters of 5–10'
Solar_eclipses_on_Saturn
Asteroid
near-Earth object and potentially hazardous asteroid of the Amor group, with a diameter of 2 kilometers (1.2 mi). It was discovered on 24 July 1998, by astronomers
(52768)_1998_OR2
Type of motion
the angular displacement, θ 1 {\displaystyle \theta _{1}} is the initial angular position and θ 2 {\displaystyle \theta _{2}} is the final angular position
Rotation_around_a_fixed_axis
Projectile impact patterns
target distance. Thus, by using angular measurements, one can reliably compare the relative tightness of shot groupings fired at different distances. For
Shot_grouping
Fraction of the diameter of the eclipsed body which is in eclipse
The magnitude of eclipse is the fraction of the angular diameter of a celestial body being eclipsed. This applies to all celestial eclipses. The magnitude
Magnitude_of_eclipse
Concept in laser optics
{\displaystyle {\sqrt {2}}} and the cross sectional area by 2. The total angular spread of a Gaussian beam in radians is related to the Rayleigh length
Rayleigh_length
Most massive dwarf planet
light of that the team reanalyzed their old data with a lower limit on the angular motion, sorting through the previously excluded images by eye. In January
Eris_(dwarf_planet)
Astronomical phenomena viewed from the planet Mars
angular separation on the opposite side. The maximum angular separation of the Earth and Moon varies considerably according to the relative distance between
Astronomy_on_Mars
ANGULAR DIAMETER-DISTANCE
ANGULAR DIAMETER-DISTANCE
Boy/Male
Indian, Sanskrit
Praising; A Hymn
Boy/Male
Muslim
Heart, Conscience
Girl/Female
Afghan, American, British, Christian, English, Finnish, French, Greek, Indian, Irish, Lebanese, Polish, Portuguese, Romanian, Spanish, Swedish, Tamil
Heavenly Messenger; Angel; Messenger from God
Girl/Female
Indian, Tamil
Lovely; Kind-hearted
Boy/Male
Gujarati, Hindu, Indian, Kannada
Spark of Fire
Male
Hungarian
Hungarian form of Latin Demetrius, DEMETER means "loves the earth" or "follower of Demeter."Â
Girl/Female
Greek
Earth-lover. Demeter is the mythological Greek goddess of corn and harvest. She withdraws for the...
Girl/Female
Australian, French, Greek
Earth-lover; Demeter is the Mythological Greek Goddess of Corn and Harvest
Girl/Female
French Spanish American Italian Latin Greek
Angel.
Boy/Male
Hindu, Indian, Kannada, Tamil
Witty; Super
Female
Greek
(ΔημήτηÏ) Greek myth name of a goddess of agriculture, derived from Doric Da-mater, DEMETER means "earth mother." Compare with masculine Demeter.
Boy/Male
Indian, Sanskrit
Radiant; Bright; Enlightening
Girl/Female
Greek
Earth-lover. Demeter is the mythological Greek goddess of corn and harvest. She withdraws for the...
Boy/Male
Australian, Danish, French, German, Swiss
The People's Ruler; Army of the People; Warrior of the People
Boy/Male
Indian
Heart, Conscience
Boy/Male
Arabic
Heart; Conscience
Boy/Male
Arabic, Muslim, Sindhi
Conscience; Heart
Boy/Male
Arabic, Hindu, Indian, Muslim
Shining
Boy/Male
German
Army of the people.
Female
English
Feminine form of Latin Angelus, ANGELA means "angel, messenger."
ANGULAR DIAMETER-DISTANCE
ANGULAR DIAMETER-DISTANCE
Boy/Male
Gujarati, Hindu, Indian, Kannada
Ray of Sun
Boy/Male
American, Anglo, British, Christian, English, German
Warrior Chief; Noble; Brave; Leader of the Warriors; Royal Courage
Boy/Male
Hebrew
Destroyer.
Boy/Male
Tamil
Courageous
Boy/Male
Indian, Sanskrit
Cloud; Orange Flower
Boy/Male
Arabic, Muslim
Name of a Sahabiyyah
Surname or Lastname
English
English : unexplained.
Boy/Male
Hindu, Indian
God
Boy/Male
Indian
King; Lovely
Boy/Male
Indian
A prophets name
ANGULAR DIAMETER-DISTANCE
ANGULAR DIAMETER-DISTANCE
ANGULAR DIAMETER-DISTANCE
ANGULAR DIAMETER-DISTANCE
ANGULAR DIAMETER-DISTANCE
a.
Not angular.
a.
Relating to an angle or to angles; having an angle or angles; forming an angle or corner; sharp-cornered; pointed; as, an angular figure.
n.
The singular number, or the number denoting one person or thing; a word in the singular number.
a.
Of or pertaining to the jugular vein; as, the jugular foramen.
a.
Thorough; complete; unmitigated; as, a regular humbug.
n.
An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnifying power.
adv.
In an angular manner; with of at angles or corners.
a.
Having the form of a ring; annular.
v. t.
To make angular.
a.
Measured by an angle; as, angular distance.
n.
The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module.
a.
Constituted, selected, or conducted in conformity with established usages, rules, or discipline; duly authorized; permanently organized; as, a regular meeting; a regular physican; a regular nomination; regular troops.
a.
Having all the parts of the same kind alike in size and shape; as, a regular flower; a regular sea urchin.
n.
Same as Decameter.
adv.
In an angular manner; angularly.
a.
Conformed to a rule; agreeable to an established rule, law, principle, or type, or to established customary forms; normal; symmetrical; as, a regular verse in poetry; a regular piece of music; a regular verb; regular practice of law or medicine; a regular building.
a.
Pertaining to, or having the form of, a ring; forming a ring; ringed; ring-shaped; as, annular fibers.
pl.
of Ungula
n.
The length of a straight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock.
a.
Fig.: Lean; lank; raw-boned; ungraceful; sharp and stiff in character; as, remarkably angular in his habits and appearance; an angular female.