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Astronomy · L4 · Stellar Kinematics: Proper Motion, Radial Velocity & Space Velocity · flowchart

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by @openstemUpdated Astronomy
Star's true 3D velocityComponent across the sky: tangentialComponent along the line of sight: radialMeasured as proper motion, an angular rateNeeds distance to convert to a true speedTangential velocity v_t = 4.74 x proper motion x distanceMeasured directly via Doppler shiftRadial velocity v_rCombine: v = sqrt of v_t squared plus v_r squaredFull 3D space velocity

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