We present a proper motion study of the distant globular cluster NGC 7006 based on the measurement of 25 photographic plates spanning a 40-year interval .

The absolute proper motion determined with respect to extragalactic objects is ( \mu _ { \alpha } cos \delta , \mu _ { \delta } ) = ( -0.96 , -1.14 ) \pm ( 0.35 , 0.40 ) mas yr ^ { -1 } .
The total space velocity of NGC 7006 in a Galactocentric rest frame is 279 km s ^ { -1 } , placing the cluster on one of the most energetic orbits ( R _ { a } = 102 kpc ) known to date for clusters within 40-kpc from the Galactic center .

We compare the orbits — as determined from full space velocities — of four clusters that have apocentric radii larger than 80 kpc with those of Galactic satellites with well-measured proper motions .
These clusters are NGC 5466 , NGC 6934 , NGC 7006 and Pal 13 and the satellites are the Sagittarius dwarf spheroidal galaxy ( dSph ) , the Large Magellanic Cloud , Ursa Minor dSph and Sculptor dSph .
Only NGC 5466 and NGC 6934 seem to have similar orbital parameters , indicating a possible phase-space association .
NGC 7006 , Pal 13 and the “ pair ” NGC 5466 , NGC 6934 do not show any dynamical association with the Galactic satellites considered here .
NGC 5466 , NGC 6934 , NGC 7006 and Pal 13 have orbits which are highly eccentric and of various inclinations with respect to the Galactic plane .
In contrast , the orbits of the Galactic satellites are of low to moderate eccentricity and highly inclined .
Based on orbit types , chemical abundances and cluster parameters , we discuss the properties of the hypothetical host systems of the remote globulars in the Searle-Zinn paradigm .
It is apparent that clusters such as NGC 5466 , NGC 6934 and NGC 7006 formed in systems that more likely resemble the Fornax dSph , rather than the Sagittarius dSph .

We also discuss plausible causes for the difference found so far between the orbit type of outer halo clusters and that of Galactic satellites and for the tentative , yet suggestive phase-space scatter found among outer halo clusters .