The file p11-a.bsp was created October 1994 using a series of Pioneer 11 orbit solutions
of unknown pedigree.  It uses the DE-118 inertial reference frame. This trajectory solution
is presumably not as good as p11_sat336.bsp described below.

Time of Jupiter closest approach obtained using WebGeocalc is:  1974 12 03 05:21:29.8 UTC
Time of Saturn closest approach obtained using WebGeocalc is:   1979 09 01 16:29:33.6 UTC

Summary for: p11-a.bsp
 
Body: PIONEER-11 (-24) w.r.t. JUPITER BARYCENTER (5)
      Start of Interval (ET)              End of Interval (ET)
      -----------------------------       -----------------------------
      1974 OCT 05 22:42:17.672            1975 JAN 30 11:59:26.237
 
Body: PIONEER-11 (-24) w.r.t. SATURN BARYCENTER (6)
      Start of Interval (ET)              End of Interval (ET)
      -----------------------------       -----------------------------
      1979 JUN 27 13:38:08.390            1979 AUG 28 00:00:50.182
      1979 AUG 28 00:00:50.182            1979 NOV 06 21:40:29.946
 
Body: PIONEER-11 (-24) w.r.t. SUN (10)
      Start of Interval (ET)              End of Interval (ET)
      -----------------------------       -----------------------------
      1973 APR 09 03:55:06.852            1973 APR 11 15:00:44.185
      1973 APR 11 15:00:44.185            1974 OCT 05 22:42:17.672
      1975 JAN 30 11:59:26.237            1979 JUN 27 13:38:08.390
      1979 NOV 06 21:40:29.946            1990 JAN 02 00:00:57.183
 
Body: PIONEER-11 (-24) w.r.t. EARTH (399)
      Start of Interval (ET)              End of Interval (ET)
      -----------------------------       -----------------------------
      1973 APR 06 02:25:44.185            1973 APR 09 03:55:06.852
 
Bodies: EARTH BARYCENTER (3) w.r.t. SOLAR SYSTEM BARYCENTER (0)
        JUPITER BARYCENTER (5) w.r.t. SOLAR SYSTEM BARYCENTER (0)
        SATURN BARYCENTER (6) w.r.t. SOLAR SYSTEM BARYCENTER (0)
        SUN (10) w.r.t. SOLAR SYSTEM BARYCENTER (0)
        EARTH (399) w.r.t. EARTH BARYCENTER (3)
        Start of Interval (ET)              End of Interval (ET)
        -----------------------------       -----------------------------
        1973 APR 06 02:25:44.185            1990 JAN 02 00:00:57.183
 
Bodies: IO (501) w.r.t. JUPITER BARYCENTER (5)
        EUROPA (502) w.r.t. JUPITER BARYCENTER (5)
        GANYMEDE (503) w.r.t. JUPITER BARYCENTER (5)
        CALLISTO (504) w.r.t. JUPITER BARYCENTER (5)
        JUPITER (599) w.r.t. JUPITER BARYCENTER (5)
        Start of Interval (ET)              End of Interval (ET)
        -----------------------------       -----------------------------
        1974 NOV 01 00:00:45.182            1974 DEC 31 00:00:45.183
 
Bodies: MIMAS (601) w.r.t. SATURN BARYCENTER (6)
        ENCELADUS (602) w.r.t. SATURN BARYCENTER (6)
        TETHYS (603) w.r.t. SATURN BARYCENTER (6)
        DIONE (604) w.r.t. SATURN BARYCENTER (6)
        RHEA (605) w.r.t. SATURN BARYCENTER (6)
        TITAN (606) w.r.t. SATURN BARYCENTER (6)
        HYPERION (607) w.r.t. SATURN BARYCENTER (6)
        IAPETUS (608) w.r.t. SATURN BARYCENTER (6)
        SATURN (699) w.r.t. SATURN BARYCENTER (6)
        Start of Interval (ET)              End of Interval (ET)
        -----------------------------       -----------------------------
        1979 AUG 01 00:00:50.183            1979 SEP 30 00:00:50.182
 



The file p11_sat336.bsp (originally named p11.sat336.bsp) was created by Robert Jacobson
around Summer 2010. It uses the J2000 reference frame. It covers ONLY a short
time around Saturn closest approach.

Time of Saturn closest approach obtained using Webgeocalc is: 1979 09 01 16:30:33.4 UTC

Summary for: p11_sat336.bsp
 
Body: PIONEER-11 (-24) w.r.t. SATURN BARYCENTER (6)
      Start of Interval (ET)              End of Interval (ET)
      -----------------------------       -----------------------------
      1979 AUG 20 12:00:00.000            1979 SEP 05 00:00:00.000


More details about the files are available in the comment areas of the files.
You may read these comments using the "commnt" utility program available in
any SPICE Toolkit.