As of 7/15/2015, Petra Venj has a bounty that unlocks a new quest (The Archon-Slayer) via a bounty. Once the bounty is completed, you can't access the quest again until she has the bounty. Gonna do some testing later today to see if you could delete the bounty while in orbit so that it doesn't complete and see if you could replay it that way.

~Creeper

It might indeed work like the last Urn bounty from Eris. Would be interesting to know.

Yeah, that's what I was thinking :)

Just confirming that once you've started the mission, you can delete the bounty to keep playing the mission over and over again. I will also be submitting a PB shortly. (1:43)