shepherd satellite

Save This Word!

a small moon orbiting near a planetary ring, whose gravitational pull helps confine the ring and the ring's extent.
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
Also called shepherd moon .
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use shepherd satellite in a sentence

Scientific definitions for shepherd satellite

shepherd satellite
[ shĕpərd ]

A moon that orbits near the edge of a planetary ring, stabilizing the ring's particles through gravitational pull and confining the ring to a sharply defined band. For example, the moons of Uranus known as Cordelia and Ophelia are shepherd satellites that constrain Uranus's rings to a narrow band. It is believed that the gravity of the fast-moving inner satellite Cordelia causes the particles of the inner ring to speed up and move to outer orbits, while at the same time the gravity of the slower, outer satellite Ophelia decelerates outer particles, pushing them inward. The result is a compressed, well-defined ring. Also called shepherd moon
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.