Verification of the high proper motion of Albus 4 (TYC 6017–419–1), a representative blue high proper motion object, in a Ks-band 2MASS image. The epochs of observation in the AC2000.2 (blue diamond), SuperCOSMOS (red square), and 2MASS (yellow circles) are shown in parenthesis. The DENIS epoch almost coincides with the 2MASS one.
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