13. On 10 October your 1500 zone time DR position is LAT 27°35.6' S, LONG 44°49.0' W. You are on course 342°T at a speed of 24 knots. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?

The optimal celestial fix utilizes bright bodies with altitudes between 30 and 60 and wide azimuth separation. Moon, Al Na'ir, and Rigil Kentaurus satisfy these criteria at the specified date, time, and DR position, providing strong crossing angles for an accurate fix.