 Techniques for identifying extrasolar objects generally cannot determine whether an object has "cleared its orbit", except indirectly via an orbit-clearing criterion.The wording of the 2006 definition is heliocentric in its use of the word "Sun" instead of "star or stars", and is thus not applicable to the numerous objects which have been identified in orbit around other stars.A separate "working" definition for extrasolar planets was, however, recommended by a working group of the IAU in 2003 and includes the criterion