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.
http://www.martin-nicholson.info/1/1a.htm
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