Five probes, five mission limits

Vega 1’s Venus balloon transmitted atmospheric data for 46.5 hours, until its battery failed.

The consulted excerpt provides no supported Phobos 2 milestone or operating constraint.

Galileo began orbiting Jupiter on 8 December 1995, the first spacecraft to do so; the excerpt notes no science-shaping constraint.

Huygens made the first soft landing on Titan on 14 January 2005; the excerpt identifies no further operating constraint.