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Archimedes' Principle01:13

Archimedes' Principle

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Related Experiment Video

Updated: Jul 11, 2026

Murine Neural Plate Targeting by In Utero Nano-Injection (NEPTUNE) at Embryonic Day 7.5
10:49

Murine Neural Plate Targeting by In Utero Nano-Injection (NEPTUNE) at Embryonic Day 7.5

Published on: February 14, 2022

1981N1: A Neptune Arc?

W B Hubbard

    Science (New York, N.Y.)
    |March 14, 1986
    PubMed
    Summary
    This summary is machine-generated.

    A 1981 Neptune object, initially thought to be a satellite, was likely a planetary arc. Simultaneous observations at Flagstaff, Arizona, ruled out a satellite and constrained arc geometries.

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    Area of Science:

    • Planetary Science
    • Astronomy
    • Neptune System Dynamics

    Background:

    • In 1981, an object near Neptune was detected via stellar occultation and initially identified as a new satellite.
    • Subsequent reinterpretation proposed the object might have been a Neptune arc, similar to one observed in 1984.

    Purpose of the Study:

    • To re-evaluate the nature of the 1981 Neptune object.
    • To differentiate between a potential Neptune satellite and a planetary arc.
    • To constrain the possible geometries of Neptune arcs.

    Main Methods:

    • Analysis of simultaneous stellar occultation measurements from 1981.
    • Comparison of observations from Tucson, Arizona, and Flagstaff, Arizona.
    • Geometric modeling to assess the feasibility of arc configurations.

    Main Results:

    • The 1981 object did not occult the star during simultaneous observations at Flagstaff, Arizona.
    • This null result contradicts the interpretation of the object as a Neptune satellite.
    • The findings significantly constrain the possible shapes and orientations of Neptune arcs.

    Conclusions:

    • The 1981 Neptune object is unlikely to have been a satellite.
    • The data supports the hypothesis that the object was a Neptune arc.
    • This study provides crucial observational constraints for understanding Neptune's arc phenomena.