a: Radial velocity versus [Fe/H] for APOGEE stars towards the UKS 1 field. b: kernel density estimation (KDE) of the VIRAC proper motions. c: CMD using VVV+2MASS J and K_s bands for stars within the half-light cluster radius. The six highest likelihood members of UKS 1 analysed in this work are marked with lime square symbols. a: average in radial velocity and metallicity of our sample is marked by the blue cross symbol, while the blue rectangle indicates 3σ_RV and 3σ_[Fe/H]. The black dotted lines in (a) and (b) indicate the nominal [Fe/H], μ_α cos δ, μ_δ, and radial velocity from Origlia et al. (2005) and Baumgardt et al. (2019), respectively. The blue dotted lines in (b) indicate our estimated μ_α cos δ and μ_δ using VIRAC proper motions. Error bars are provided in Tables 1 and 2.