  The International Celestial Reference Frame (ICRF) plays an important role in
astronomy and geodesy. The realization of ICRF is based on the position of
thousands of quasars observed using the Very-Long Baseline Interferometry
(VLBI) technique. Better quality of ICRF is achieved when the position of the
quasars is stable. In this study, we aim to analyze the stability of one of the
quasars in ICRF called 4C31.61 (2201+315). We performed VLBI data analysis by
using Vienna VLBI and Satellite Software (VieVS) to get the position of the
quasar. We also used the data of the quasar's position from the Paris
Observatory Geodetic VLBI Center. We examined the stability of the quasar
position by using the Allan standard deviation technique. We found that the
quasar 4C31.61 (2201+315) has a stable position with the dominance of white
noise across the majority of time scales.
