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Eccentricity of an Ellipse

An ellipse is a fundamental conic section defined by the constant sum of distances from any point on its curve to two fixed points, known as the foci. This geometric property can be physically demonstrated using a pencil, string, and two pins. By anchoring the string at both ends and maintaining it taut with a pencil, one can trace the outline of an ellipse.The shape and extent of the ellipse are determined by its eccentricity, e, defined as the ratio of the distance between the center and a...
Periodic Classification of the Elements04:00

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Unusual Results01:16

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Related Experiment Video

Updated: Jul 12, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

The strange periodic comet machholz.

D W Green, H Rickman, A C Porter

    Science (New York, N.Y.)
    |March 2, 1990
    PubMed
    Summary
    This summary is machine-generated.

    Comet Machholz is unique, approaching the sun closer than any planet. Its orbit shows it

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    Area of Science:

    • Astronomy
    • Cometary Science
    • Orbital Dynamics

    Background:

    • Periodic comet Machholz 1986 VIII (1986e) exhibits an exceptionally close perihelion.
    • Its orbital period is 5.25 years, with a decreasing perihelion distance.
    • This makes it a unique subject for cometary evolution studies.

    Purpose of the Study:

    • To review observations of comet Machholz since its discovery.
    • To investigate the comet's orbital evolution over 4000 years using numerical simulations.
    • To discuss prospects for observing its 1991 perihelion passage.

    Main Methods:

    • Review of observational data from comet discovery.
    • Numerical simulations of the comet's orbit over an extended period (4000 years).

    Main Results:

    • Comet Machholz's perihelion distance has decreased significantly since A.D. 700.
    • The comet is expected to reach an extremely small perihelion distance (0.03 AU) by 2450.
    • The comet's orbit is predicted to eventually lead to increasing perihelion distances if it survives.

    Conclusions:

    • Comet Machholz provides a rare opportunity to study cometary evolution under extreme solar proximity.
    • Numerical models predict significant changes in its orbit over millennia.
    • Further observations are crucial for understanding its long-term survival and behavior.