Launched in 1990, the NASA/ESA Hubble Space Telescope remains the premier UV and visible light telescope in orbit. With well over 1.6 million observations from 10 different scientific instruments, the ESA Hubble Science Archive is a treasure trove of astronomical data to be exploited.
European Space Agency, 2017, A Precision Measurement Of The Mass Of The Cepheid V350 Sgr, 1.0, European Space Agency, https://doi.org/10.5270/esa-lc4bh80