Term Index (digit or symbol)
- ⯓:
- *:
- ⊕:
- ★:
- ☉:
- ☿:
- ♀:
- ♁:
- ♂:
- ♃:
- ♄:
- ♅:
- ♆:
- ♇:
- ⚳:
- ⛢:
- α:
- alpha disk: well-known model of an accretion disk
- spectral index (α): power by which an object's flux depends on frequency
- α disk:
- αCO:
- alpha CO (αCO): ratio of CO emissions to H2
- Å:
- angstrom (Å): unit of length 10-10 meters
- β:
- beta (β): ratio of plasma pressure to magnetic pressure
- Burnham Double Star Catalogue (BDS,BU): 1906 catalog with multiple star systems and non-orbiting double stars
- spectral index (α): power by which an object's flux depends on frequency
- β decay:
- beta decay: radioactivity such that an electron or positron is emitted
- β Per:
- Algol (Beta Per,β Per): multiple star system demonstrating effects of mass transfer
- β Persei:
- Algol (Beta Per,β Per): multiple star system demonstrating effects of mass transfer
- β Pic b:
- β Pictoris:
- βpm:
- χ² test:
- Δ:
- Δ²R:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- étendue:
- etendue (AΩ): measure of how wide and deep a telescope observes
- ε:
- ε Ind:
- Epsilon Indi (ε Indi,ε Ind): nearby star system including two brown dwarf companions
- ε Indi:
- Epsilon Indi (ε Indi,ε Ind): nearby star system including two brown dwarf companions
- η:
- chirp mass (Mc,ℳ): a reduced-mass-like quantity that relates to gravitational waves
- γ:
- ℏ:
- κ:
- opacity (κ): a measure of opaqueness of a material
- permeability (κ,k): ability of a material to allow fluids to pass through it
- κ-mechanism:
- kappa mechanism (κ-mechanism): stellar instability caused by opacity increasing with temperature
- &Lambda:
- Λ:
- cosmological constant (Λ): force counteracting the universe's inward gravitational pull
- eigenvalue (λ): ratio between a vector and a linear transformation of that vector
- Jeans parameter (λ): ratio measuring a tendency of an atmosphere to escape
- λ Boo:
- ΛCDM:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- ℳ:
- chirp mass (Mc,ℳ): a reduced-mass-like quantity that relates to gravitational waves
- μ:
- μFUN:
- MicroFUN (μFUN): observers following up on microlensing events in the galactic bulge
- μGal:
- Gal: gravimetry unit of the effect of a planet's gravity
- μK:
- kelvin (K): temperature scale starting at absolute zero
- ν:
- neutrino (ν): light, electrically neutral elementary particle
- wavenumber (ν): reciprocal of wavelength
- Ω:
- Ω-m:
- siemens (S): SI unit of electrical conductance
- ΩΛ:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- Ω0:
- Ωb:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- Ωbh²:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- ΩdΩc:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- Ωdh²:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- Ωm:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- Öpik-Oort Cloud:
- Oort Cloud: cloud of comets and minor planets around the solar system
- Φ:
- ΦTidal:
- tide: effect of Moon's gravity on Earth's seas, etc.
- π:
- pion (π): first type of meson discovered
- ρc:
- Σ:
- τ:
- τadvec:
- advection: transport of something through a fluid's motion
- τKH:
- τT:
- ϒ:
- ζ Aurigae:
- ζ Aurigae system:
- *α² Canum Venticorum variable:
- 0ES:
- HEAO-2: 1978 X-ray observatory space mission
- 0FGL:
- Fermi (FGST,GLAST): satellite for studying gamma rays
- 1 Ceres:
- asteroid: minor planet without comet characteristics
- Ceres: dwarf planet and largest asteroid
- dwarf planet: round like a planet, only smaller
- 1 Jansky Empty Field Survey (1 Jy): survey to find optical identifications for weak radio sources
- 1 Jy:
- 1-point function:
- 1.27m Mount Stromlo Telescope:
- MACHO Project: survey searching out microlensing that could indicate a MACHO
- 1.3-mm observation: observation frequency useful for detecting dust
- 1.5m Hale Telescope:
- 1/f noise:
- red noise: noise tending toward lower frequencies
- 1/Vmax method:
- 10 Hygiea:
- asteroid: minor planet without comet characteristics
- 101955 Bennu: near-Earth asteroid that is the target of a sample-return mission
- OSIRIS-REx: space mission aiming to return a sample of an asteroid
- 10199 Chariklo: largest minor planet in the outer solar system
- 1050cm:
- 10C:
- 134340 Pluto:
- 136108 Haumea:
- 136199 Eris:
- 136472 Makemake:
- 13MM:
- 140 Foot Telescope:
- 150 megaparsecs:
- 15760 1992 QB11:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 15760 Albion:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 16 Psyche:
- Psyche: planned space mission to orbit an asteroid
- 16-pole:
- 18 cm line:
- hydroxyl (OH): neutral compound of hydrogen and oxygen, one atom each
- 1947 sunspot: largest sunspot ever recorded
- 1987A:
- SN 1987A (1987A): supernova in February 1987 rare for being visible by the naked eye
- 1992 QB11:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 1999 RQ36:
- 101955 Bennu: near-Earth asteroid that is the target of a sample-return mission
- OSIRIS-REx: space mission aiming to return a sample of an asteroid
- 19P/Borrelly:
- 1A:
- Ariel 5: 1970s X-ray space telescope
- 1AGL:
- AGILE: Italian space gamma-ray observatory
- 1C:
- 1D climate model:
- 1D model:
- 1E:
- HEAO-2: 1978 X-ray observatory space mission
- 1E 6057-556:
- 1ES:
- HEAO-2: 1978 X-ray observatory space mission
- 1FGL:
- Fermi (FGST,GLAST): satellite for studying gamma rays
- 1H:
- HEAO-1: 1977 X-ray observatory space mission
- 1PN:
- 1RXH:
- ROSAT: 1990s German space X-ray telescope
- 1RXS:
- ROSAT: 1990s German space X-ray telescope
- 1SWASP:
- SuperWASP (SWASP): broad Earth-based search for transiting planets
- 1SWASP J140747:
- J1407: star orbited by a companion with a ring system
- 1SWASP J140747.93-394542.86:
- J1407: star orbited by a companion with a ring system
- 2 Pallas:
- asteroid: minor planet without comet characteristics
- 2-brane:
- brane: mathematical object with dimensions
- 2-point correlation function:
- 2-point function:
- 20000 Varuna:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 2002 AW197:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 2002 TC302:
- 2002 TX300:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 2002 UX25:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 2003 VB12:
- Sedna: distant solar system planetoid discovered in 2003
- 2004 XR190:
- 2012 VB113:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 2014 MU69:
- 21-cm experiment: search for redshifted 21-cm hydrogen emission lines
- 21-cm line: hydrogen line useful for determining redshift
- HI 4-Pi Survey (HI4PI): HI map based upon EBHIS and GASS
- self-absorption: EMR absorption by the same substance that emitted it
- spin (ms): an angular-momentum quantum number
- 243 Ida:
- 25m Dwingeloo Radio Telescope:
- 26-Meter Telescope:
- 26P/Grigg-Skjellerup:
- Giotto: 1980s space mission carrying out a Comet Halley flyby
- 28978 Ixion:
- 2A:
- Ariel 5: 1970s X-ray space telescope
- 2C:
- 2D model:
- 2dF:
- 2dF Galaxy Redshift Survey (2dFGRS): imaging survey of 300,000 objects
- 2dF-SDSS LRG and QSO survey (2SLAQ): spectroscopic survey of distant galaxies
- 2dFGRS:
- 2E:
- HEAO-2: 1978 X-ray observatory space mission
- 2FGL:
- Fermi (FGST,GLAST): satellite for studying gamma rays
- 2HWC:
- 2M:
- 2MA:
- 2MASP:
- 2MASS:
- 2MASS 0720-0846:
- 2MASS 1207:
- 2MASS J0445930-1516166:
- LHS 1140: red dwarf with rocky planet in its habitable zone
- 2MASS J07200325-0846499:
- 2MASS J16264502-2423077:
- 2MASS J23062928-0502285:
- TRAPPIST-1: red dwarf with exoplanet near the habitable zone
- 2MASS J2530084+1652532:
- 2MASS photometric system:
- 2MASSI:
- 2MASSW:
- 2MASX:
- 2MUCD:
- 2PN:
- 2SLAQ:
- 2U:
- Uhuru: 1970 satellite X-ray telescope
- 3 Juno:
- asteroid: minor planet without comet characteristics
- 3-brane:
- brane: mathematical object with dimensions
- 3-point correlation function:
- 3-point function:
- 3-simplex:
- 30 Doradus:
- 32-pole:
- 38628 Huya:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 3A:
- Ariel 5: 1970s X-ray space telescope
- 3C:
- 3C 273: first quasar discovered
- 3C 279: striking variable quasar
- 3C 295: distant radio galaxy
- 3C 303: Seyfert galaxy
- 3C 327: elliptical radio galaxy
- 3C 348: giant elliptical radio galaxy
- 3C 400:
- W51: cloud complex radio source
- 3C 405:
- Cygnus A (3C 405,QSO B1957+405): early-discovered radio galaxy and quasar
- 3C 48: radio galaxy/quasar
- 3C 9: first quasar discovered
- 3CR:
- 3CRR:
- 3D model:
- 3D-HST: near-infrared survey of 100,000 galaxies by HST
- 3FHL:
- Fermi (FGST,GLAST): satellite for studying gamma rays
- 3GM:
- JUICE: mission to Jupiter in development
- 4 Vesta:
- asteroid: minor planet without comet characteristics
- 4-brane:
- 4-metre Multi-object Spectroscopic Telescope:
- 4MOST: spectrograph in development for VISTA telescope
- 43 Meter Telescope:
- 47 Tuc:
- 47 Tucanae (47 Tuc): bright globular cluster
- 47171 Lempo:
- 4C:
- 4LGSF:
- 4MOST: spectrograph in development for VISTA telescope
- VISTA: 4.1 meter telescope in Paranal Observatory in Chile
- 4U:
- Uhuru: 1970 satellite X-ray telescope
- 5-dimensional warped geometry theory:
- 50000 Quaoar:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 51 Eri b:
- 51 Eridani:
- 51 Eridani b: Jupiter-like planet discovered in 2015
- 51 Peg b:
- 51 Pegasi b (51 Peg b): first exoplanet found orbiting a main sequence star
- 51 Pegasi:
- 51 Pegasi b (51 Peg b): first exoplanet found orbiting a main sequence star
- 51 Pegasi b (51 Peg b): first exoplanet found orbiting a main sequence star
- 5335 Damocles:
- damocloid: minor planet with a comet-like orbit
- 55 Cancri e (55 Cnc e): superearth orbiting a Sun-like star
- 55 Cnc e:
- 55 Cancri e (55 Cnc e): superearth orbiting a Sun-like star
- 5535 Annefrank:
- Stardust: space mission that collected and returned comet coma dust
- 55565 2002AW197:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 55636 2002 TX300:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 55637 UX25:
- Kuiper Belt (K Belt,KB): further part of solar system beyond Neptune
- 5C:
- 60-inch Hale Telescope:
- 67P:
- 67P/C-G:
- 67P/Churyumov-Gerasimenko (67P,67P/C-G): comet visited by Rosetta space mission
- CAESAR: planned space mission to return a sample of a comet
- Rosetta: space probe that visited a comet
- 6C:
- 6dF:
- 6dF Galaxy Survey (6dFGS): UKST survey of galaxies in the southern sky
- 6dFGS:
- 775 AD event: apparent solar eruption, based upon tree-ring evidence
- 7C:
- 84522 2002 TC302:
- 87GB:
- 87GB Catalog of Radio Sources (87GB): 1980s Green Bank radio survey
- 8C:
- 90377 Sedna:
- 90482 Orcus:
- 92-cm line:
- 21-cm line: hydrogen line useful for determining redshift
- 951 Gaspra:
- Galileo: circa 1990s space mission to Jupiter
- 9969 Braille:
- 9C:
- μ:
- permeability (κ,k): ability of a material to allow fluids to pass through it
- a:
- b:
- e:
- l:
- m:
- 1H: hydrogen isotope with no neutrons
- 1H burning:
- 2H:
- deuterium (D,2H): hydrogen isotope with one neutron
- 44Ti:
- 56Co:
- 56Ni:
- 60Co:
- [CH]:
- methylidyne (CH): compound of one carbon and one hydrogen atom
- [CI]:
- carbon (C): element, C, atomic number 6
- fine structure: separate spectral lines due to electron spin and relativistic effects
- [CII]:
- [Fe II]:
- iron (Fe): metal, Fe, atomic number 26
- [Fe/H]:
- iron (Fe): metal, Fe, atomic number 26
- [HI]:
- [O III]:
Index