Probe ships now have the ability to launch probes down Hyperspace Rifts. Okay they always had this capability but now you'll get a stellar Map of the sector the Hyperspace Rift leads to.
Use action code 112
Put the location of the Hyperspace Rift in the Location #1 slot. Note it is a move and do so the fleet will move there.
Put the fleet with the probe ship in the Fleet #1 slot.
You'll get a sector map as if you launched a sector probe.
Pirates, Smugglers, and Cybers can launch Rift sector probes at tec level 18, all others at tec level 40.
Either probe ship works for this.