How to use Proper-motion in a sentence

proper-motion
  • His most interesting paper is "On the Proper Motion of the Solar System," and was published in the Phil.

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  • If these suppositions have a basis of reality, the proper motion of Algol should be disturbed by a small, but measurable undulation, corresponding to the projection of its orbit upon the sky; and although certainty on the point cannot be attained for some years to come, Lewis Boss regarded the evidence available in 1895 as tending to confirm Dr Chandler's theory.6 Proceedings Amer.

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  • He made a great number of observations of stars with proper motion.

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  • No correction for any defect in it has been found necessary; moreover, no rotation of the base relative to the directions of the stars without proper motion has been detected.

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  • In many other double stars the two components have very nearly the same proper motion.

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  • The stars selected to be examined for parallax are usually either the brightest stars or those with an especially large proper motion.

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  • If three plates (or three sets of exposures on one plate) are taken at intervals of six months, when the stars in the region have their maximum parallactic displacements, the first and third plates serve to eliminate the proper motion of the star, and the detection of a parallax is easy.

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  • Bossert's catalogue (Paris Observations, 1890), which consist of lists of stars of large proper motion determined from a variety of sources.

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  • In the table is given a list of the stars now known to have an annual proper motion of more than 3".

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  • When the parallax of a star is known, we are able to infer from its proper motion its actual linear speed in miles per hour, in so far as the motion is transverse to the line of sight.

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  • It will be seen that the proper motion of any star may be regarded as made up of two components.

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  • A very weighty objection is that the stars whose parallaxes are determined are mainly those of large proper motion and therefore not fairly representative of the bulk of the stars; in fact their peculiar motions will not neutralize one another in the mean.

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  • On the 23rd of September he detected near the predicted place a small star unrecorded in the map, and next evening found that it had a proper motion.

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  • They need, after a time, to be corrected, not only systematically for precession, but also empirically for proper motion.

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  • Bakos et al. calculated the equatorial coordinates for epoch and equinox 2000.0 using their astrometry and proper motion measurements.

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  • The astrometric precision will also enable proper motion studies, and accurate comparisions of oh masers with methanol, water and other species.

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  • In all, 389 distinct X-ray sources were detected, at least two-thirds of which were associated with a single proper-motion cluster member.

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