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   71044
   The new X-ray nova XTE J1748-288 was discovered in June 1998. VLA
   observations of the radio counterpart revealed proper motions of >20
   mas/day, which would correspond to a speed of > 0.1 c assuming a
   distance of 10 kpc. Although 70 days have passed since the onset of the
   flare, the source is still as bright as 100 mJy at 2 GHz. Thus this
   source is evidently a jet system, probably similar to SS 433, which has
   a persistent jet of 0.26 c. With ASCA, it is possible to detect
   Doppler-shifted lines from jets, and to determine jet parameters such
   as velocity, inclination, and temperature. However, ASCA has never
   observed any jet system at the very moment of jet ejection except for
   SS 433. Therefore, it is strongly desired to observe the new jet XTE
   J1748-288 with ASCA as soon as possible.
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