Lecture 5 Review: Observations

Direct Measurement

Indirect Measurement

Position(RA and DEC)

Distance

Temperature

Mass

Size

Age

Known stars

Transform from x-y in palte to RA-DEC

Motion

Radial velocity/Rotation: red/bule shift

Trangential velocity: angle change

Gravity

Keppler's third law

Virial theorem

Effective termperature

Ionization temperature

Infer from flux and blackbody radiation

Use planet transits

Color temperature

Composition

Elements

Spectrum analysis

Magnetic filed

Dark matter

Central blackhole

Trigonometry

Anchors

Measured brightness and infered lunimosity from periods

Distance ladder

Statistics

Mesurement

Poisson process

Errors

SNR

Maximum likelihood estimation