| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
|---|---|---|---|---|
| O association (OAssociation) | ||||
|
O association |
O-association | star association |
O cluster
, OB association |
|
| OB association (ObAssociation) | ||||
|
OB association |
star association |
O association
, young star |
||
| objective grating (objectiveGrating) | ||||
|
objective grating |
diffraction grating
, transmission grating |
echelle grating
, reflection grating |
||
| objective (objective) | ||||
|
objective [optics] |
primary lens
, primary mirror |
optical telescope | ||
| primary optics of telescope | ||||
| objective prism (objectivePrism) | ||||
|
objective prism |
prism | Schmidt telescope | ||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| oblateness (oblateness) | ||||
|
oblateness |
elliptical galaxy
, equatorial bulge , planet , rotation |
|||
| oblique rotator (obliqueRotator) | ||||
|
oblique rotator |
Ap star
, magnetic star , spectrum variable star |
|||
| obliquity of ecliptic (obliquityOfEcliptic) | ||||
|
obliquity of ecliptic |
obliquity |
celestial equator
, ecliptic , ecliptic plane , phase defect , precession |
||
| observational cosmology (observationalCosmology) | ||||
|
observational cosmology |
Hubble law
, color-redshift relation , cosmological distance scale , galaxy count , galaxy distribution , observation , radio source count , redshift , redshift distance relation |
|||
| observation (observation) | ||||
|
observation |
CCD observation
, optical observation |
data acquisition
, observational cosmology , observing technique , research |
||
| combine with other terms | ||||
| observatory (observatory) | ||||
|
observatory |
antarctic observatory
, gamma-ray observatory , geophysical observatory , infrared observatory , optical observatory , radio observatory , space observatory , ultraviolet observatory , X-ray observatory |
dome
, planetarium , site protection , site testing , telescope |
||
| only the broad classes are shown below; specific type will be found under these, or from the hierarchical list | ||||
| observing technique (observingTechnique) | ||||
|
observing technique |
method of observation |
astrometry
, interferometry , photometry , polarimetry , radio astrometry , radio interferometry , spectrophotometry , spectroscopy |
astronomical technique
, data acquisition , data processing , observation , occultation , photography |
|
| only the broad classes are shown below; specific type will be found under these, or from the hierarchical list | ||||
| OB star (ObStar) | ||||
|
OB star |
early-type star
, young star |
B star
, O star , OB supergiant |
runaway star
, young star cluster |
|
| OB supergiant (ObSupergiant) | ||||
|
OB supergiant star |
OB star
, early-type supergiant |
B supergiant
, O supergiant |
||
| occultation (occultation) | ||||
|
occultation |
asteroid occultation
, lunar occultation , radio occultation |
Moon
, angular diameter , binary star , diameter , eclipse , observing technique , planet , transit |
||
| FVH: added asteroid_occultation and lunar_occultation (2007-OCT-8) | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| occulting disk (occultingDisk) | ||||
|
occulting disc UK occulting disk |
separation
, visual binary star |
|||
| oceanography (oceanography) | ||||
|
oceanography |
ocean tide | |||
| ocean tide (oceanTide) | ||||
|
ocean tide |
tide | oceanography | ||
| O cluster (OCluster) | ||||
|
O-star cluster |
open star cluster |
B star
, O association , O star |
||
| O dwarf (ODwarf) | ||||
|
O dwarf star |
O star
, dwarf |
|||
| Oef star (OefStar) | ||||
|
Oef star |
O star
, early-type emission star |
Of star | ||
| Oe star (OeStar) | ||||
|
Oe star |
O star
, early-type emission star |
|||
| Of star (OfStar) | ||||
|
Of star |
O star
, early-type emission star |
Oef star | ||
| O giant (OGiant) | ||||
|
O giant star |
O star | |||
| OH absorption (OhAbsorption) | ||||
|
OH absorption |
interstellar absorption | hydroxyl radical | ||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| OH cloud (OhCloud) | ||||
|
OH cloud |
interstellar matter | hydroxyl radical | ||
| OH emission (OhEmission) | ||||
|
OH emission |
emission spectrum | hydroxyl radical | ||
| OH IR star (OhIrStar) | ||||
|
OH/IR star |
OH-IR star |
OH source
, giant , infrared source |
OH maser
, hydroxyl radical , variable star |
|
| OH line (OhLine) | ||||
|
OH line |
hydroxyl radical | |||
| OH maser (OhMaser) | ||||
|
OH maser |
maser |
OH IR star
, SiO maser , hydroxyl radical , water maser |
||
| subtype not included | ||||
| OH source (OhSource) | ||||
|
OH source |
radio source | OH IR star | hydroxyl radical | |
| old star (oldStar) | ||||
|
old star |
evolved star |
population II star
, population III star , pre-Galactic star |
||
| FVH: added NT POPULATION_III_STARS (2007-SEP-21) | ||||
| O magnitude (OMagnitude) | ||||
|
O magnitude |
apparent magnitude |
far infrared radiation
, infrared photometry |
||
| Omega baryon (OmegaBaryon) | ||||
|
Omega(baryon), the cosmological baryon mass-density fraction |
Omega(baryon) | Omega parameter |
baryon
, mass density |
|
| FVH: new (2007-OCT-24) | ||||
| Omega Lambda (OmegaLambda) | ||||
|
Omega(Lambda), the cosmological vacuum energy density fraction |
Omega(Lambda) | Omega parameter |
cosmological constant
, energy density |
|
| FVH: new (2007-OCT-24) | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| Omega mass (OmegaMass) | ||||
|
omega(mass), the cosmological matter density fraction |
Omega(mass) | Omega parameter | mass density | |
| FVH: new (2007-OCT-24) | ||||
| Omega parameter (OmegaParameter) | ||||
|
the cosmological density fraction parameter, Omega |
cosmological parameter |
Omega baryon
, Omega Lambda , Omega mass |
cosmology
, energy density , mass density |
|
| FVH: new (2007-SEP-21) | ||||
| on-line system (onLineSystem) | ||||
|
on-line system |
on line system |
data center
, data processing |
||
| Oort cloud (OortCloud) | ||||
|
Oort cloud |
Oort comet cloud |
comet
, trans-Neptunian object |
||
| Oort constant (OortConstant) | ||||
|
Oort constant |
astronomical constant |
Galactic rotation
, Galactic structure |
||
| Oort formulae (OortFormulae) | ||||
|
Oort formulae |
Oort formulas |
Galactic rotation
, Galactic structure |
||
| Oosterhoff group (OosterhoffGroup) | ||||
|
Oosterhoff group |
RR Lyrae star
, globular star cluster , metal abundance |
|||
| opacity (opacity) | ||||
|
opacity |
optical property |
Kramers opacity
, Rosseland opacity |
absorption
, atmosphere , negative H ion , optical depth , radiation , radiative transfer , transparency |
|
| open star cluster (openStarCluster) | ||||
|
open star cluster |
star cluster |
Galactic cluster
, O cluster , young star cluster |
blue straggler star
, moving cluster parallax , population I star , radiant moving cluster , spiral arm , star association , turnoff point |
|
| open universe (openUniverse) | ||||
|
open universe |
cosmology |
Big Bang theory
, closed universe , steady-state theory |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| Opik theory (OpikTheory) | ||||
|
Opik theory |
nebula
, supernova |
|||
| opposition (opposition) | ||||
|
opposition |
conjunction
, quadrature , synodic period , syzygy |
|||
| refers to planet position | ||||
| optical aberration (opticalAberration) | ||||
|
aberration of optical image |
aberration |
astigmatism
, chromatic aberration , comatic aberration , distortion , field curvature , spherical aberration |
focus
, lens , mirror , optical system , optics , telescope |
|
| FVH: renamed for more clarity (2007-OCT-3) | ||||
| optical burst (opticalBurst) | ||||
|
optical burst |
burst |
X-ray burst
, burster , gamma-ray burst , radio burst |
||
| specifically from burster | ||||
| optical component (opticalComponent) | ||||
|
optical component |
corrector plate
, diffraction grating , field corrector , grism , interference filter , lens , mirror , optical fiber , optical filter , optical waveguide , optical window |
|||
| not a complete list of terms | ||||
| optical depth (opticalDepth) | ||||
|
optical depth |
optical thickness |
absorption coefficient
, gas density , opacity |
||
| optical design (opticalDesign) | ||||
|
optical design |
optical instrument | |||
| optical double star (opticalDoubleStar) | ||||
|
apparent optical double star |
angular separation | |||
| use only for pair in chance alignment; refer also to visual binary star | ||||
| optical fiber (opticalFiber) | ||||
|
optical fiber |
glass fiber |
optical component
, optical waveguide |
fiber optics
, glass , multi-fiber spectrograph , optical instrument |
|
| optical film (opticalFilm) | ||||
|
optical film |
film [optical] |
antireflection coating
, thin film |
dichroic mirror
, interference filter , light interference |
|
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| optical filter (opticalFilter) | ||||
|
optical filter |
color filter |
filter
, optical component |
interference filter
, iodine cell , photographic filter |
dichroic mirror
, light interference , optical window , photometry , ultraviolet filter |
| optical flare (opticalFlare) | ||||
|
optical flare |
flare |
flare star
, prominence |
||
| optical glass (opticalGlass) | ||||
|
optical glass |
glass
, optical material |
optical window | ||
| optical identification (opticalIdentification) | ||||
|
optical identification |
optical counterparts |
X-ray identification
, X-ray source , gamma-ray source , radio source |
||
| optical instrument (opticalInstrument) | ||||
|
optical instrument |
optical equipment |
camera
, coronagraph , monochromator , optical scanners , photometer , polarimeter , seeing monitor , spectrograph , telescope |
Hartmann test
, collimator , field corrector , lens , mirror , modulation transfer function , optical design , optical fiber , optical material , optical system , optical testing , optical transfer function , prism |
|
| only the broad classes are shown below; specific type will be found under these, or from the hierarchical list | ||||
| optical interferometer (opticalInterferometer) | ||||
|
optical interferometer |
stellar interferometer | interferometer |
Michelson interferometer
, intensity interferometer |
long baseline interferometer |
| optical interferometry (opticalInterferometry) | ||||
|
optical interferometry |
light interferometry
, stellar interferometry |
interferometry |
Michelson interferometry
, interference fringe , interference wave , light interference , long baseline interferometry |
|
| optical material (opticalMaterial) | ||||
|
optical material |
glass
, optical glass |
lens
, mirror , optical instrument |
||
| optical observation (opticalObservation) | ||||
|
optical observation |
observation | optical observatory | ||
| optical observatory (opticalObservatory) | ||||
|
optical observatory |
observatory | Hubble Space Telescope |
optical observation
, optical telescope , seeing monitor |
|
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| optical outburst (opticalOutburst) | ||||
|
optical outburst |
outburst |
cataclysmic variable star
, flare star , nova , supernova |
||
| not from burster | ||||
| optical pathlength (opticalPathlength) | ||||
|
optical pathlength |
refractive index | |||
| optical position (opticalPosition) | ||||
|
optical position |
astrometry | |||
| optical property (opticalProperty) | ||||
|
optical property |
property |
albedo
, brightness , color , opacity , refractive index |
brightness temperature
, darkness , isotropy , light polarization , optics |
|
| not a complete list of terms | ||||
| optical pulsar (opticalPulsar) | ||||
|
optical pulsar |
pulsar | radio pulsar | ||
| optical radar (opticalRadar) | ||||
|
optical radar |
radar |
laser ranging
, laser , lunar laser ranging , satellite laser ranging |
||
| optical scanners (opticalScanners) | ||||
|
optical scanners |
optical instrument | spectrophotometry | ||
| optical spectrograph (opticalSpectrograph) | ||||
|
optical spectrograph |
optical spectrometer | spectrograph | ||
| optical spectroscopy (opticalSpectroscopy) | ||||
|
optical spectroscopy |
spectroscopy | |||
| optical surface (opticalSurface) | ||||
|
optical surface |
aluminum coating
, antireflection coating , figuring , lens , mirror , polishing , silver coating , thin film |
|||
| FVH: renamed from optical_surface (2007-OCT-2) | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| optical system (opticalSystem) | ||||
|
optical system |
catadioptric system
, catoptric system , dioptric system |
aperture
, chromatic aberration , comatic aberration , distortion , field curvature , optical aberration , optical instrument |
||
| optical telescope (opticalTelescope) | ||||
|
optical telescope |
telescope |
automatic patrol telescope
, multiple mirror telescope , reflecting telescope , refracting telescope , very large telescope |
catadioptric system
, catoptric system , dioptric system , eyepiece , objective , optical observatory , secondary mirror , tertiary mirror |
|
| optical testing (opticalTesting) | ||||
|
optical testing |
figuring
, modulation transfer function , optical instrument , optical transfer function |
|||
| optical transfer function (opticalTransferFunction) | ||||
|
optical transfer function |
OTF | transfer function |
modulation transfer function
, optical instrument , optical testing |
|
| optical transmission window (opticalTransmissionWindow) | ||||
|
optical transmission window through the atmosphere |
atmospheric window |
infrared transmission window
, radio transmission window |
||
| FVH: renamed to avoid confusion with optics (2007-NOV-2) | ||||
| low absorption in atmosphere | ||||
| optical waveguide (opticalWaveguide) | ||||
|
optical waveguide |
optical component
, waveguide |
optical fiber | ||
| optical window (opticalWindow) | ||||
|
optical window [optics] |
optical component |
optical filter
, optical glass |
||
| optics (optics) | ||||
|
optics |
active optics
, adaptive optics , astronomical optics , fiber optics |
adjustment
, angular resolution , collimation , optical aberration , optical property , refractive index , resolution , transmission |
||
| combine with other terms | ||||
| orbital anomaly (orbitalAnomaly) | ||||
|
orbital_anomaly |
apparent anomaly | orbital element |
eccentric anomaly
, mean anomaly , real anomaly , true anomaly |
anomalistic month
, anomalistic year |
| orbital element (orbitalElement) | ||||
|
orbital element |
apsis
, center of mass , eccentricity , inclination , orbital anomaly , osculatory element , period , position angle , semimajor axis |
acceleration
, celestial mechanics , orbit , regression of node |
||
| FVH: removed element_of_orbit (2007-SEP-24) | ||||
| see also orbit | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| orbital evolution (orbitalEvolution) | ||||
|
orbital evolution |
celestial mechanics | |||
| orbital motion (orbitalMotion) | ||||
|
orbital motion |
motion |
celestial mechanics
, circular orbit , orbital velocity , visual binary star |
||
| orbital theory (orbitalTheory) | ||||
|
orbital theory |
celestial mechanics | |||
| orbital velocity (orbitalVelocity) | ||||
|
orbital velocity |
velocity |
angular velocity
, escape velocity , orbital motion , orbit , tangential velocity |
||
| orbit determination (orbitDetermination) | ||||
|
orbit determination |
binary star
, multiple star , planet |
|||
| orbit (orbit) | ||||
|
orbit |
Keplerian orbit
, elliptical orbit , geocentric orbit , heliocentric orbit , hyperbolic orbit , osculating orbit , parabolic orbit , periodic orbit , polar orbit |
N-body problem
, Roche limit , Schwarzschild metric , acceleration , apsidal motion , apsis , binary star , celestial mechanics , high-velocity star , Local Standard of Rest , motion , multiple star , node , orbital element , orbital velocity , parabolic velocity , period , perturbation , perturbation theory , planet , position angle , synchronous rotation , three-body problem , trajectory |
||
| see also orbital element | ||||
| organic matter (organicMatter) | ||||
|
organic matter |
organic molecule | |||
| organic molecule (organicMolecule) | ||||
|
organic molecule |
molecule
, organic matter |
interstellar molecule
, molecular spectrum |
||
| orientation (orientation) | ||||
|
orientation |
adjustment
, alignment optics , collimation , position angle |
|||
| origin (origin) | ||||
|
origin |
Solar System
, chemical element , element formation , galaxy , life , planet |
|||
| combine with other terms | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| orion population star (orionPopulationStar) | ||||
|
orion population star |
early-type star
, pre-main sequence star |
|||
| orrery (orrery) | ||||
|
orrery |
model |
motion
, planetarium |
||
| orthohydrogen (orthohydrogen) | ||||
|
orthohydrogen |
molecular hydrogen | parahydrogen | ||
| orthoscopic eyepiece (orthoscopicEyepiece) | ||||
|
orthoscopic eyepiece |
eyepiece | |||
| oscillating universe (oscillatingUniverse) | ||||
|
oscillating universe |
cosmology | Friedmann universe | ||
| oscillation (oscillation) | ||||
|
oscillation |
amplitude
, decay oscillation , e-folding time , pendulum , wave |
|||
| combine with other terms | ||||
| oscillator strength (oscillatorStrength) | ||||
|
oscillator strength |
f value
, f-value |
g value
, gf value , line formation , line width , transition probability |
||
| osculating orbit (osculatingOrbit) | ||||
|
osculating orbit |
orbit | |||
| osculatory element (osculatoryElement) | ||||
|
osculatory element |
orbital element |
celestial mechanics
, perturbation |
||
| osmium (osmium) | ||||
|
osmium (atomic number 76) |
Os | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| O star (OStar) | ||||
|
O star |
OB star
, early-type star , young star |
O dwarf
, O giant , O subdwarf , O supergiant , Oe star , Oef star , Of star |
O cluster
, Wolf-Rayet star , early-type variable star , spectral type |
|
| O subdwarf (OSubdwarf) | ||||
|
O subdwarf star |
O star
, subdwarf |
|||
| O supergiant (OSupergiant) | ||||
|
O supergiant star |
O star
, OB supergiant , early-type supergiant , supergiant |
|||
| outburst (outburst) | ||||
|
outburst |
burst
, flare |
optical outburst |
high-state
, low-state |
|
| outer planet (outerPlanet) | ||||
|
outer planet |
planet | Jovian planet | inner planet | |
| outgassing (outgassing) | ||||
|
outgassing |
cryogenics
, vacuum technique |
|||
| overabundance (overabundance) | ||||
|
overabundance |
abundance | underabundance | ||
| ES: new (2007-OCT-8) | ||||
| overtone frequency (overtoneFrequency) | ||||
|
overtone frequency |
harmonic overtones
, overtones |
Fourier analysis
, fundamental frequency , harmonic frequency , multi-periodic variable star , overtone mode |
||
| see sn for overtone mode; also see harmonic frequency | ||||
| overtone mode (overtoneMode) | ||||
|
overtone mode |
overtones | pulsation mode |
fundamental mode
, multi-periodic variable star , overtone frequency , pulsating variable star |
|
| of pulsation frequency, not Fourier component of non-sinusoidal variation | ||||
| oxygen burning (oxygenBurning) | ||||
|
oxygen burning |
nuclear fusion
, nucleosynthesis |
carbon burning
, helium burning , hydrogen burning , oxygen , stellar interior |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| oxygen (oxygen) | ||||
|
oxygen (atomic number 8) |
O | fundamental chemical element |
oxygen burning
, titanium oxide |
|
| FVH: new (2007-OCT-25) | ||||
| ozone layer (ozoneLayer) | ||||
|
ozone layer |
Earth atmosphere | |||