Current and future wide field surveys in infrared passbands present opportunities for ultra low-mass stellar sample selection via proper motions, as well as or instead of purely photometric techniques. Furthermore, proper motion measurements yield additional clues as to candidate membership of cluster or field (kinematic) populations. In this paper we review some recent results and speculate as to the possibilities afforded by the next generation of wide-field infrared surveys.
- Proper motion
- Surveys: infrared