  We report observations of a unique, large prominence eruption that was
observed in the He II 304 {\AA} passband of the the Extreme Ultraviolet
Imager/Full Sun Imager telescope aboard Solar Orbiter on 15-16 February 2022.
Observations from several vantage points (Solar Orbiter, the Solar-Terrestrial
Relations Observatory, the Solar and Heliospheric Observatory, and
Earth-orbiting satellites) were used to measure the kinematics of the erupting
prominence and the associated coronal mass ejection. Three-dimensional
reconstruction was used to calculate the deprojected positions and speeds of
different parts of the prominence. Observations in several passbands allowed us
to analyse the radiative properties of the erupting prominence. The leading
parts of the erupting prominence and the leading edge of the corresponding
coronal mass ejection propagate at speeds of around 1700 km/s and 2200 km/s,
respectively, while the trailing parts of the prominence are significantly
slower (around 500 km/s). Parts of the prominence are tracked up to heights of
over $6 R_\sun$. The He II emission is probably produced via collisional
excitation rather than scattering. Surprisingly, the brightness of a trailing
feature increases with height. The reported prominence is the first observed in
He II 304 {\AA} emission at such a great height (above 6 $R_\sun$).
