Ike longitude where Duna is right overhead

[RenevB]

I just landed on Ike, aiming for a relatively flat place where you could see Duna. I ended up at about 79 23 west and Duna appears quite close to being straight overhead. The law of round numbers (not sure if such a law actually exists) makes me guess Duna is straight overhead for Ike longitude 80 west, but is there anyone who has the exact numbers for this?

The wiki does say that Ike is on average overhead at Duna longitude 3 east, but doesn't seem to have anything for the reverse.

I'm also aware this might not technically be a gameplay question, but I'm still curious.

[indroth]

I would imagine the exact position would oscillate somewhat because the orbit isn't perfectly circular.

[Tank Buddy]

I'm afraid I don't, but you can just cancel your horizontal velocity from orbit when Duna is overhead.