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A Possible New Common Proper Motion Pair?
A Possible New Common Proper Motion Pair?
TYC 2523-1622-1 and TYC 2523-1878-1 in Ursa Major Careful measurement over many years reveals that all stars are moving independently through space and this results in slow changes in their position relative to the earth. Proper Motion is a vector, that is it has both a magnitude and a direction. The magnitude has units of arc seconds per year and the direction is expressed in degrees with 0 degrees being north, 90 degrees being east and so on. Most catalogues present variable star information in the form of the magnitude of the motion in both right ascension and in declination since these are at right angles to each other. For a pair to be considered a binary the two components would be expected to show very similar proper motion. Reliable and up-to-date results are not available for all stars but where such information is used it is clear that although many systems previously reported as binaries are in fact "just" double stars there are also previously unlisted binary stars just waiting to be identified. http://www.martin-nicholson.info/cpm/cpmmaster.htm Martin Nicholson, Daventry, England. My website is at http://www.martin-nicholson.info/1/1a.htm My informal Astronomical Blog is at http://ukastronomy.livejournal.com/ |
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