Peculiar Motions
Peculiar Stars
Stars with spectra that cannot be conveniently fitted into any of the standard spectral classifications. They are denoted by a p after their spectral type.
Peculiar motions are one cause of the observed scatter in the Hubble diagram of velocity against distance.
its motion relative to the mean of all the stars, is Motion called its peculiar motion (motus peculiaris).
Giant structures, infall, and large-scale peculiar motions give new insight into how clusters form vis-a-vis galaxies. The two basic possibilities are bottom-up and top-down.
22 The peculiar motion of Saturn's co-orbital satellites, Janus and Epimetheus, which play a never-ending game of tag as they move on their orbits around the planet.
system are usually designated U, V, and W, given in km/s, with U positive in the direction of the Galactic center, V positive in the direction of galactic rotation, and W positive in the direction of the North Galactic Pole.[4] The peculiar motion of ...
It is now known that these perturbations were spurious; Pluto's small mass could not have produced a gravitational force strong enough to be the source of the peculiar motions.
In addition to the motion due to the expansion of the Universe, galaxies have "relative motions" due to the gravitational pull of neighboring galaxies. Because of these peculiar motions, ...
 See also: Galaxy, Gravitation, Mass, Cluster, Density
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