Recap:
Bounty: safe rescue of Sym Alvira, a Kian'thar from Shaum Hii.
Reason: he knows something the Empire does not want to get out, the Empire has put out a general bounty on his head for 10,000 credits
Last known location: unknown, but bounty hunters seeking him were involved in a gunfight in a cantina on Ririmanna VI.
The good news is there are now three bounty hunters known to be on the hunt, not four. One was killed in trhge gunfight.
Other known hunters: the bounty hunters remaining on Ririmanna VI are Jelyn Seruna, a Mon Cal; Sensii Maleri, a female dug known to use a Sorosuub Firelance; and a human male named Bato Xyanis. the bounty hunter that was killed was a human named Hyet Vilane
Ririmanna VI
Ririmanna VI is a terrestrial world in the Ririmanna system, obviously it is the sixth planet. It is a thickly overgrown swamp world, but is also a junk planet, home to tremendous scrapyards, where other systems dump their waste. The few inhabitants eke out an existence in the scrap heaps. There is only one known 'spaceport' .the locals call it Fottu.
The Ririmanna system is in the Oplovis sector (the next sector to the 'east' of the Atrivis Sector). If you take the Braxant Run hyperlane as far as Ketaris, then head 'north' into the sector you should be able to reach it in about 2 days with the Rampant Bulwarks speed of hyperdrive 2.0.
You should be able to make the trip in four jumps. The first jump to reach the Relgim Run Hyperlane, between Generis and Devon. Then the second jump down the Relgim Run to Fedje, to switch to the Braxant Run. The third jump takes you along the Braxant Run to Ketaris. The fourth jump is off the hyperlane, from Ketaris to Ririmanna VI.
The alternative, straight from Bisay IV to Ririmanna VI, would take almost four times as long, because it is off the hyperlanes.