of the same box with HRI ROSAT (ROSAT X-ray Images, 1994a; ROSAT Guest Observer Program, 1994b) it is seen (Fig.1) that in this case a single object, which could be connected with this brightness, can be situated very close to us, if its temperature is $T_{bb}  \la
10^{5}\ \rm K$.

Estimations of proper motions
-----------------------------

Close objects (of NS type) can have considerable proper motions. For example, at a velocity of $\approx\,200\,{\rm  km/s}$ and a distance of 100 pc the proper motion up to 0.4 arcsec/year can be expected from such an object. But if the object has a non–thermal spectrum, it may be photometrically lost among the great number of other objects. That is why the proper motion measurement is of special importance as an opportunity to select [*all*]{} close objects with high spatial velocities. The proper motion measurement procedure was as follows.

All images were reduced to one frame of reference with the help of bright stellar–like objects with normal stellar color indices. Since these objects lie in the range of 20-21$^m$, they are the most probable stars at the distance of several kiloparsecs and, correspondingly, are good reference points for construction of motionless frame of reference. Since 