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Measurement of Astronomical Objects - Coggle Diagram
Measurement of Astronomical Objects
Mass
Gravity and Rotation
Virial Theorem
Luminosity
L=4pi r*r flux
Composition
Atomic and Molecular
Structure
Asteroseismology
Components for a galaxy
Dark Matter
Central Blackhole
B field
Age
It's hard to obtain a stars' age. But if the star is in a cluster, then we're able to estimate its age by plotting every star in the cluster on the HR Diagram.
Environment
Clusters
Galaxy Clusters
Position and Motion
Position(in the sky)
We measure the position of stars by astrometry, which is the action of measuring one stars' position by measuring its distance and direction relative to a reference star
Motion
Proper Motion
Radial Velocity
Distance
Parallax
Cepheids
Type Ia supernovae
Size and Morphology
Size=Angular Size*Distance
By obtaining luminosity, we can roughly know a stars' size, without having to know its angular size.
We can also obtain orbital radius by Kepler's Third Law.
Temperature
Effective Temperature
Effective temperature is the temperature calculated by Stefan-Boltzmann's Law corresponding to the same amount of a stars' bolometric flux
Color Temperature
Color temperature is obtained by curve fitting of a stars' flux-versus-frequency graph