My current WIP involves an athletics competition on a non-terraformed moon, namely the Earth's moon. And while it would be a bit difficult to play certain sports without a breathable atmosphere, the javelin throw strikes me as an event that would be better enjoyed in the moon's 'fresh air' – or rather, lack of it. So, other than the additional challenge of wearing a space suit (and trying to make the damn thing land point first), I would expect an outdoor javelin throw on the moon, after accounting for other variables.
The only thing is: would it? I don't know if the air on Earth has the effect of reducing the length of a javelin throw through obvious frictional effects (as it would with a thrown stone or shot put) or increasing it by giving it something to glide on (as it would with a paper plane).
My hunch is that a realistic world record, after factoring in the other variables like restricted movement from wearing a space suit, would be somewhere in the 400-500 metre range for men, 300-400 metres for women, and 350-450 for eligible non-binary folks. (For comparison, the world records back on Earth currently stand at 98.48 and 72.28 metres for men and women respectively.) Are my guesses realistic?