A Doppler-approach-scaling scan holds the rest wavelength fixed and varies the approach speed across three rows, checking that the signed shift ratio delta-lambda / lambda = v / c grows in magnitude row by row. The arithmetic is exact only for the stated velocities, rest wavelengths, shifts, and rows in the ideal low-speed Doppler model. Real observations add cadence, bandpass, stellar variability, line identification, detector calibration, background/noise, finite precision, and measurement uncertainty.
Three exact rows show signed approach-speed scaling. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
A faster approach gives a larger blueshift ratio
The signed training ratio keeps the approach direction negative; larger magnitude radial speed makes a larger magnitude blueshift.
λΔλ=cv=6−2=3−1
A faster approach gives a larger blueshift ratio
The signed training ratio keeps the approach direction negative; larger magnitude radial speed makes a larger magnitude blueshift.
λΔλ=cv=6−3=2−1
A faster approach gives a larger blueshift ratio
The signed training ratio keeps the approach direction negative; larger magnitude radial speed makes a larger magnitude blueshift.