Astrometry & Parallax

Annual parallax and proper motion

Star Parameters

Parallax (mas): 10.0 Proper Motion μ_α (mas/yr): 20.0 Proper Motion μ_δ (mas/yr): 10.0

Ecliptic Latitude β (deg): 45🔑 Unlock

Observations

Measurement Noise (mas): 0.5 Observation Duration (years): 2.0 Observations per Year: 12

Animation

Astrometric Solution

Instructions

Star traces ellipse from parallax + linear proper motion
Parallax determines distance: d = 1/p parsecs
Fit recovers parallax and proper motion from noisy data
Gaia measures positions to ~0.01-1 mas precision
Higher noise → larger uncertainties in fit