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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
Descriptionaltbroadernarrowerrelated
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
 

Thu Jul 3 16:30:01 2008