  We used 1,477,047 data from DR1-TGAS, in order to analyse the minimum
require- ments of accuracy, necessary to detect sub-stellar objects in the
astrometric mea- surements of Gaia. We found that the first set of data (DR1)
does not have enough accuracy, so sub-stellar objects can not be easily
detected. Barely, it would be possible to detect jovian and higher mass
objects, with orbital periods over 5 years. We made the calculations of the
minimum values of the astrometric angle produced by an or- biting sub-stellar
object using a range of different masses. We estimate the efficiency and
effectiveness of the DR1-TGAS data in order to detect sub-stellar objects and
the minimum accuracy that Gaia would be required to detect these objects using
the datasets that the mission will release in the near future.
