As an explorer, it's handy to know the distance of a planet from the star, so a rough calculation can be made as to whether it's likely to be in the "Goldilocks" zone, and therefore a possible terraform candidate.
This distance is shown on the system map for single planets (the semi major axis). However, for bodies in binary or trinary configs, the semi major access is always usually zero, as it's the distance between the binary/trinary bodies. There's no indication as to the distance from the star itself. This would be a very handy addition, so we can decide by looking at the system map whether it's worth taking the time to travel to the bodies to do a detailed surface scan, like we can at present for single planets.
See below images:
[EDIT] Just remembered, iirc, the distance to the star is shown on the popup panel which appears when you target a body in the system map. Which is broken at the moment for me, but should be fixed in the patch coming early May.
This distance is shown on the system map for single planets (the semi major axis). However, for bodies in binary or trinary configs, the semi major access is always usually zero, as it's the distance between the binary/trinary bodies. There's no indication as to the distance from the star itself. This would be a very handy addition, so we can decide by looking at the system map whether it's worth taking the time to travel to the bodies to do a detailed surface scan, like we can at present for single planets.
See below images:


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