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Lecture5:observation - Coggle Diagram
Lecture5:observation
Measure Properties of Astronomical Objects
types of astronomical objects and their properties
position:astrometry
motion
angular velocity:proper motion
radical velocity:Doppler effect
redshift:for galaxies and quasars
velocity dispersion:line width
mass
gravity and rotation
viral theorem:2K + V = 0
size
angular size and distance
unresolved stars:luminosity
unresolved planet:transit
morphology:imaging
luminosity:flux and distance
temperature
kinetic/effective/color/excitation and ionization
age
population:star clusters
single star:HR diagram
environment
composition
atomic and molecular:spectrum
extinction and reddening
structure:seismology
magnetic filed
component for galaxies:dark matter
time variation:star formation rate
distance
parallax
trigonometry
angular to actual length via velocity
luminosity
standard candles
spectroscopic parallax
Hubble constant
distance ladder
Quantify Measurements
the goal of all measurements:a high enough snr
accuracy&precision
signal:flux*exposure time
noise
photon noise
background noise