24

SECTION 4. HEADERS

Table 4.1.

IAU-recommended basic units.

Quantity

Unit

Meaning

Notes

SI base & supplementary units

length

meter

m

mass

kilogram

g gram allowed

kg

time

second

s

plane angle

radian

rad

solid angle

steradian

sr

temperature

kelvin

K

electric current

ampere

A

amount of substance

mole

mol

luminous intensity

candela

cd

IAU-recognized derived

units

s-1

frequency

hertz

Hz

energy

joule

Nm

J

J s-1

power

watt

W

J C-1

electric potential

volt

V

kg m s-2

force

newton

N

N m-2

pressure, stress

pascal

Pa

electric charge

coulomb

As

C

V A-1

electric resistance

ohm

Ohm

A V-1

electric conductance

siemens

S

C V-1

electric capacitance

farad

F

magnetic flux

weber

Vs

Wb

Wb m-2

magnetic flux density

tesla

T

Wb A-1

inductance

henry

H

luminous flux

lumen

cd sr

lm

lm m-2

illuminance

lux

lx

FITS Standard