sentences:  The next mission to use a halo orbit was Solar and Heliospheric Observatory (SOHO), also a joint ESA/NASA mission to study the Sun, which arrived at Sun–Earth in 1996.It used an orbit similar to ISEE-3.Although several other missions since then have traveled to Lagrange points, they typically have used the related non-periodic variations called Lissajous orbits rather than an actual halo orbit.