Units in VizieR

Symbol
    (the (*) indicates non-standard units)compute:
 %                 percent                         10–2
 A                 Ampere                          A
 a                 year                            3.15576×10+7s
 a0                (Bohr radius)                   5.29177×10–11m
 al                light-year                      9.46053×10+15m
 alpha             (fine structure constant)       7.29735×10–3
 Angstroem         Angstroem(0.1nm)  (*)           10–10m
 Angstrom          Angstroem(0.1nm)  (*)           10–10m
 arcm              minute of arc                   4.62963×10–5
 arcmin            minute of arc                   4.62963×10–5
 arcs              second of arc                   7.71605×10–7
 arcsec            second of arc                   7.71605×10–7
 atm               atmosphere                      1.01325×10+5Pa (kg⋅m–1⋅s–2)
 AU                astronomical unit               1.49598×10+11m
 au                astronomical unit               1.49598×10+11m
 bar               bar(10+5Pa)  (*)                10+5Pa (kg⋅m–1⋅s–2)
 barn              barn(10–28m2)                   10–28m+2
 bit               binary information unit          
 byte              byte(8bits)                      
 C                 Coulomb                         C (s⋅A)
 c                 c(speed_of_light)               2.99792×10+8m⋅s–1
 cal               calorie  (*)                    4.1854J (kg⋅m+2⋅s–2)
 cd                candela(lumen/sr)               cd
 cKayser           centi-Kayser(cm–1)  (*)         m–1
 Crab              Crab (X-ray) flux               1.43×10–11kg⋅s–3
 ct                count                            
 D                 Debye (dipole)                  3.33333×10–30m⋅s⋅A
 d                 day                             8.64×10+4s
 deg               degree                          2.77778×10–3
 degC              Celsius                         K
 degF              Fahrenheit  (*)                 5.55556×10–1K
 degree            degree                          2.77778×10–3
 dyn               dyne(10–5N)  (*)                10–5N (kg⋅m⋅s–2)
 e                 e(electron_charge)              1.60218×10–19C (s⋅A)
 Earth             Earth (geo) unit                 
 eps0              (electric constant)             8.85419×10–12kg–1⋅m–3⋅s+4⋅A+2
 erg               erg(10–7J)  (*)                 10–7J (kg⋅m+2⋅s–2)
 eV                electron-Volt                   1.60218×10–19J (kg⋅m+2⋅s–2)
 F                 Farad                           F (kg–1⋅m–2⋅s+4⋅A+2)
 G                 G(gravitation constant)         6.673×10–11kg–1⋅m+3⋅s–2
 g                 gram                            10–3kg
 gauss             Gauss(10–4T)  (*)               10–4T (kg⋅s–2⋅A–1)
 geoMass           Earth mass                      5.9742×10+24kg
 H                 Henry                           H (kg⋅m+2⋅s–2⋅A–2)
 h                 hour                            3.6×10+3s
 h                 hour                            3.6×10+3s
 \h                hbar(Planck constant)           1.05457×10–34kg⋅m+2⋅s–1
 hr                hour(use 'h')  (*)              3.6×10+3s
 Hz                Herz                            Hz (s–1)
 inch              inch  (*)                       2.54×10–2m
 J                 Joule                           J (kg⋅m+2⋅s–2)
 JD                Julian Day                      8.64×10+4s
 jovMass           Jupiter mass                    1.8986×10+27kg
 Jup               Jupiter (jovian) unit            
 Jy                Jansky(10–26W/m2/Hz)            10–26kg⋅s–2
 K                 Kelvin                          K
 k                 k(Boltzmann)                    1.38065×10–23kg⋅m+2⋅s–2⋅K–1
 kg                kilogram                        kg
 l                 litre  (*)                      10–3m+3
 lm                lumen                           7.95775×10–2cd
 Lsun              solar luminosity                3.826×10+26W (kg⋅m+2⋅s–3)
 lx                lux(lm/m2)                      7.95775×10–2m–2⋅cd
 lyr               light-year (c*yr)  (*)          9.46053×10+15m
 m                 metre                           m
 mag               magnitude                       mag
 mas               milli-second of arc             7.71605×10–10
 me                me(electron_mass)               9.10938×10–31kg
 Mgeo              Earth mass                      5.9742×10+24kg
 min               minute                          6×10+1s
 MJD               Mod. Julian Date (JD–2400000.5) 8.64×10+4s
 Mjup              Jupiter mass                    1.8986×10+27kg
 mmHg              mercury_mm  (*)                 1.33322×10+2Pa (kg⋅m–1⋅s–2)
 mol               mole                            mol
 month             month  (*)                       
 mp                mp(proton_mass)                 1.67266×10–27kg
 Msun              solar mass                      1.989×10+30kg
 mu0               (magnetic constant)             1.25664×10–6kg⋅m⋅s–2⋅A–2
 muB               (Bohr magneton)                 9.27401×10–28m+2⋅A
 N                 Newton                          N (kg⋅m⋅s–2)
 Ohm               Ohm(V/A)                        Ohm (kg⋅m+2⋅s–3⋅A–2)
 Pa                Pascal                          Pa (kg⋅m–1⋅s–2)
 pc                parsec                          3.0857×10+16m
 ph                photon                           
 pi                pi(=3.14...)                    3.14159
 pix               pixel                            
 ppm               part per million                10–6
 R                 R(gas_constant)                 8.3143kg⋅m+2⋅s–2⋅K–1⋅mol–1
 rad               radian                          1.59155×10–1
 Rgeo              Earth radius (eq)               6.3781×10+6m
 Rjup              Jupiter radius (eq)             7.1492×10+7m
 Rsun              solar radius                    6.9599×10+8m
 Ry                Rydberg(13.6eV)                 2.17989×10–18J (kg⋅m+2⋅s–2)
 S                 Siemens(A/V)                    S (kg–1⋅m–2⋅s+3⋅A+2)
 s                 second                          s
 sec               second (use 's') (*)            s
 solLum            solar luminosity                3.826×10+26W (kg⋅m+2⋅s–3)
 solMass           solar mass                      1.989×10+30kg
 solRad            solar radius                    6.9599×10+8m
 sr                steradian                       7.95775×10–2
 Sun               Solar unit                       
 T                 Tesla                           T (kg⋅s–2⋅A–1)
 t                 ton  (*)                        10+3kg
 u                 atomic mass unit                1.66054×10–27kg
 uas               micro-second of arc             7.71605×10–13
 V                 Volt                            V (kg⋅m+2⋅s–3⋅A–1)
 W                 Watt                            W (kg⋅m+2⋅s–3)
 Wb                Weber(V⋅s)                      Wb (kg⋅m+2⋅s–2⋅A–1)
 yr                year                            3.15576×10+7s
 °                degree                          2.77778×10–3
 °C               Celsius                         K
 °F               Fahrenheit  (*)                 5.55556×10–1K
 µ0               (magnetic constant)             1.25664×10–6kg⋅m⋅s–2⋅A–2
 µas              micro-second of arc             7.71605×10–13
 Å                Angstroem(0.1nm)  (*)           10–10m
 "d:m:s"           degree arcminute arcsecond (sexagesimal angle from degree)2.77778×10–3
 "date"            Fully qualified date            8.64×10+4s
 "datime"          Fully qualified date/time       8.64×10+4s
 "day"             Day of month number             8.64×10+4s
 "h:m:s"           hour minutes seconds (sexagesimal time from hours)3.6×10+3s
 "h:m"             hour minutes (sexagesimal time from hours)3.6×10+3s
 "HH:MM:SS"        hour minutes seconds (sexagesimal time)3.6×10+3s
 "HHMMSS"          hour minutes seconds (sexagesimal time without separator)3.6×10+3s
 "m:s"             minutes seconds (sexagesimal time from minutes)6×10+1s
 "MM/YY"           Month/Year(from 1900)           2.6298×10+6s
 "MM/yy"           Month/Year(from 2000)           2.6298×10+6s
 "month"           Month name or number            2.6298×10+6s
 "Y-M-D,h:m:s"     Fully qualified date/time       8.64×10+4s
   
 ===List of possible conversion =====================  
 —              => s                                (Angle to time)  
 m                => Hz                               (Wavelength to frequency)  
 Hz               => J                                (Frequency  to Energy)  
 m                => J                                (Wavelength to Energy)  
 K                => J                                (Temperature to Energy)  
 kg               => J                                (Mass to Energy)  
 m                => cKayser                          (Wavelength tp Wavenumber)  
 cKayser          => Hz                               (Wavenumber to frequency)  
 cKayser          => J                                (Wavenumber to Energy)  


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