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Observations - Coggle Diagram
Observations
properties of astronomical objects
position & motion
observe and locate the star, transform from x-y to RA-Dec - proper motion
observe doppler shift - radial velocity
redshifted
blueshifted
unshifted
mass
(Kepler law) M = a^3 / P^2 (in solar units)
virial theorem
size,luminosity,temperature
L = 4pi * R^2 * sigma * T_eff^4
L = Flux * 4pi * d^2
age
population
composition
emission lines
absorption lines
extinction
dark matter, central blackhole
measure distance
standard candles (cepheids)
parallax
distant standards
variables （变星）
supernova
spectroscopic parallax
Hubble's law