Abstract:
Quasars are ideal targets to use for astrometric calibration of large scale astronomical surveys as
they have negligible proper motion and parallax. The forthcoming 4-m International Liquid Mirror Telescope
(ILMT) will survey the sky that covers a width of about 27'. To carry out astrometric calibration of the
ILMT observations, we aimed to compile a list of quasars with accurate equatorial coordinates and falling in
the ILMT stripe. Towards this, we cross-correlated all the quasars that are known till the present date with
the sources in the Gaia-DR2 catalogue, as the Gaia-DR2 sources have position uncertainties as small as a
few milli arcsec (mas). We present here the results of this cross-correlation which is a catalogue of 6738
quasars that is suitable for astrometric calibration of the ILMT fields. In this work, we present this quasar
catalogue. This catalogue of quasars can also be used to study quasar variability over diverse time scales
when the ILMT starts its observations. While preparing this catalogue, we also confirmed that quasars in the
ILMT stripe have proper motion and parallax lesser than 20 mas yr-1 and 10 mas, respectively.
