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Proper motion and membership determination in the young open cluster NGC 1662
Relative proper motions and cluster membership probabilities of 30 starswithin an area of 14' of diameter centered in the opencluster NGC 1662 (alpha =04h48m, delta=+10o56') are determined by combining positions ofstars observed by the Valinhos CCD meridian circle with those from otherastrometric catalogues. Our basic source for first epoch of starsbrighter than B=13 magnitudes is the AC2000 Catalogue, which provides atime baseline of about 90 years, whereas the USNO-A2.0 Catalogue is usedfor fainter stars, providing a time baseline of about 40 years in thisregion. Average accuracies in proper motion of 2 mas/yr and 7 mas/yr areachieved, respectively, when the AC2000 or the USNO-A2.0 is used.Membership determination is obtained by applying the Zhao & He(\cite{zha}) method. The cluster proper motion was found to be (-3.2+/-0.6) mas/yr in right ascension and (-1.6+/- 0.6) mas/yr in declination.
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