Fix orbital elements of Pluto's moons (Fix #3242)

data/ssystem_major.ini

@@ -32,6 +32,8 @@
 # - Planetary Physical Parameters: https://ssd.jpl.nasa.gov/planets/phys_par.html
 # Source for discovery circumstances:
 # - Planet and Satellite Names and Discoverers: https://planetarynames.wr.usgs.gov/Page/Planets
+# Mean orbital elements of Pluto's moons (based on 200 years of orbital integration.)
+# M. Brozović, M. R. Showalter, R. A. Jacobson, M. W. Buie (2015) "The orbits and masses of satellites of Pluto". Icarus 246:317-329.
 
 [adrastea]
 iau_moon_number=JXV
@@ -263,15 +265,15 @@ iau_moon_number=PI
 absolute_magnitude=0.9
 albedo=0.372
 name=Charon
-orbit_AscendingNode=93.5582
-orbit_Eccentricity=0.0002
-orbit_Epoch=2451545.0
-orbit_Inclination=0.0048
-orbit_LongOfPericenter=227.3188
-orbit_MeanLongitude=320.7583
-orbit_Period=6.387246
-orbit_SemiMajorAxis=19636
-orbit_visualization_period=6.387246
+orbit_AscendingNode=0.0
+orbit_Eccentricity=0.00005
+orbit_Epoch=2451544.5
+orbit_Inclination=0.0
+orbit_LongOfPericenter=189.9
+orbit_MeanLongitude=276.0
+orbit_Period=6.3872
+orbit_SemiMajorAxis=19596
+orbit_visualization_period=6.3872
 parent=Pluto
 radius=606.0
 rot_equator_ascending_node=287.6
@@ -733,14 +735,14 @@ type=moon
 iau_moon_number=PIII
 albedo=0.195
 name=Hydra
-orbit_AscendingNode=227.6182145734207
-orbit_Eccentricity=0.008469198926346792
-orbit_Epoch=2457939.5
-orbit_Inclination=1.974020787636261
-orbit_LongOfPericenter=585.8426709065136
-orbit_MeanLongitude=616.67133430897493
-orbit_Period=-38.46736637831656
-orbit_SemiMajorAxis=64900.41061999993140051606
+orbit_AscendingNode=122.7
+orbit_Eccentricity=0.00554
+orbit_Epoch=2451544.5
+orbit_Inclination=0.3
+orbit_LongOfPericenter=258.0
+orbit_MeanLongitude=228.4
+orbit_Period=38.2021
+orbit_SemiMajorAxis=64721
 # orbit_visualization_period=38.46736637831656
 parent=Pluto
 radius=114
@@ -827,14 +829,14 @@ type=moon
 iau_moon_number=PIV
 albedo=0.56
 name=Kerberos
-orbit_AscendingNode=227.3764616597038
-orbit_Eccentricity=0.004864921999738080
-orbit_Epoch=2457939.5
-orbit_Inclination=1.977798409818596
-orbit_LongOfPericenter=381.3281088678735
-orbit_MeanLongitude=434.71660906890009
-orbit_Period=-32.53390657388361
-orbit_SemiMajorAxis=58042.31318993637053040642
+orbit_AscendingNode=313.3
+orbit_Eccentricity=0.0
+orbit_Epoch=2451544.5
+orbit_Inclination=0.4
+orbit_LongOfPericenter=0.0
+orbit_MeanLongitude=261.9
+orbit_Period=32.1679
+orbit_SemiMajorAxis=57750
 # orbit_visualization_period=32.53390657388361
 parent=Pluto
 radius=19
@@ -1316,14 +1318,14 @@ type=moon
 iau_moon_number=PII
 albedo=0.195
 name=Nix
-orbit_AscendingNode=227.3936998012682
-orbit_Eccentricity=0.007055550100747613
-orbit_Epoch=2457939.5
-orbit_Inclination=1.970279363687845
-orbit_LongOfPericenter=429.6519171553174
-orbit_MeanLongitude=435.361493583422711
-orbit_Period=-25.25822149243385
-orbit_SemiMajorAxis=49029.22098644075783712999
+orbit_AscendingNode=0.0
+orbit_Eccentricity=0.0
+orbit_Epoch=2451544.5
+orbit_Inclination=0.0
+orbit_LongOfPericenter=0.0
+orbit_MeanLongitude=85.0
+orbit_Period=24.8548
+orbit_SemiMajorAxis=48690
 # orbit_visualization_period=25.25822149243385
 parent=Pluto
 radius=92
@@ -1813,14 +1815,14 @@ mass_kg=1.98847e30
 iau_moon_number=PV
 albedo=0.56
 name=Styx
-orbit_AscendingNode=227.3514962106030
-orbit_Eccentricity=0.02752939327739043
-orbit_Epoch=2457939.5
-orbit_Inclination=1.970282720825102
-orbit_LongOfPericenter=489.4487321111029
-orbit_MeanLongitude=491.321816443564161
-orbit_Period=-21.12062061792411
-orbit_SemiMajorAxis=43516.96054847804075659521
+orbit_AscendingNode=0.0
+orbit_Eccentricity=0.00001
+orbit_Epoch=2451544.5
+orbit_Inclination=0.0
+orbit_LongOfPericenter=17.8
+orbit_MeanLongitude=180.5
+orbit_Period=20.1617
+orbit_SemiMajorAxis=42413
 # orbit_visualization_period=21.12062061792411
 parent=Pluto
 radius=16