Bessel
Noun
Meaning
German mathematician and astronomer who made accurate measurements of stellar distances and who predicted the existence on an 8th planet (1784-1846)
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A Bessel filter (not shown) has an even poorer transition in the frequency domain, but maintains the best phase fidelity of a waveform.
Alpha Centauri A and over limb of Saturn The first direct measurement of the distance to a star ( 61 Cygni at 11.4 light-years ) was made in 1838 by Friedrich Bessel using the parallax technique.
Bessel roughly estimated the period of the companion of Sirius to be about half a century; C. A. F. Peters computed an orbit for it in 1851.
Bessel functions are therefore especially important for many problems of wave propagation and static potentials.
Bessel is responsible for the correction to the formula for the sample variance estimator named in his honour.
Asymptotic forms The Bessel functions have the following asymptotic forms.