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Lecture 5 Observations - Coggle Diagram
Lecture 5 Observations
measure objects' properties
kinematic properties
position
compare with reference stars
motion
photometric redshifts
spectroscopic redshifts
mass
Newton II law: gravity and rotation
viral theotem
size
angular size and distance
flux and distance for unresolved stars/exoplanets
mass and period for orbit
dynamic properties
luminosity:flux and distance
temperature
kinetic
effective
color
excitation
ionization
age:population
environment
composition
atomic and molecular: spectrum
sturcture
magnetic field
dark matter and central blackhole
time evolution:difficult
Its relation with us: distances
parallax
trigonometry
use sun-earth distance as a ruler
angular size to actural size
require velocity
luminosity and standard candles
period and brightness
other methods:Hubble constant
how can we evaluate the measurements
two principles
errors always occur
measurement is to improve SNR
two groups of concepts
accuracy vs precision
systematic vs random errors
two way to simulate errors
Poisson
Guassian
error propagation
do partial differential