#2) Mercury
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Author:  John Van Vliet [ Tue, 03-01-17, 1:15 GMT ]
Post subject:  #2) Mercury

--- Edit on 07-25-2018
combined Mercury,Venus,Earth,Mars into one file

-- new as of 07-25-2018 ---

-- google docs ( Mercury is part of the inner solar system spice ssc ) ... sp=sharing

( the below code is out of date and only an example
 Replace "Mercury" "Sol"
   Texture "Mercury.7.08.ctx"
   Radius 2440
   # Before SPICE
     BodyFrame { EquatorJ2000 { Center "Sol" } }
     Ending   "1550 02 27 00:00:00.000"  # add 2 months for orbit drawing
     CustomOrbit "vsop87-mercury"
     CustomRotation "iau-mercury"
   # Spice
     OrbitFrame { EclipticJ2000  { Center "Sol/Mercury_bary" }}
     BodyFrame  { EclipticJ2000 { Center "Sol"              }}
     Ending     "2649 11 25 00:00:00.000"  # less 2 month for orbit drawing
       Kernel  "de438.bsp"
       Target  "199"
       Origin  "1"
       Period   0.2441  # earth years
       BoundingRadius 1e10
     #CustomRotation "iau-mercury"
       Kernel    [ "pck00010.tpc"  "naif0012.tls"  ]
       Frame     "IAU_MERCURY" 
     # After SPICE
       BodyFrame { EquatorJ2000 { Center "Sol" } }
       CustomOrbit "vsop87-mercury"
       CustomRotation "iau-mercury"
   Albedo            0.06

You already download the rotational model and leap second files from this thread

-- de438.bsp --
-- pck00010.tpc --
-- naif0012.tls --

the barycenter ssc is needed BEFORE planets can be added

you will notice that i am using the default celestia orbit and rotational model for the BEFORE and AFTER "spice"
for the planets it is almost spot on you might notice a small shift or turn but not much
the real BIG changes are with the moons ( but not "The Moon" )

a note of WARNING!!!!!!!
the times for "Ending " for the pre and spice sections
the pre spice has 2 months added for the orbit drawing and the post sipce is less 2 months
BE VERY CAREFUL on the days and months , not every month has 31 days
there is 28/29 , 30 ,and 31
if you list too many days you WILL get an error
Feb 31 will give you an error

WARNING - for Linux and maybe Apple users ( Apple is an unknown at this time )
this file needs to be part of a single "SolarSystem.SPICE.ssc file
the c-Language read order is in affect on these Operating Systems

Author:  John Van Vliet [ Tue, 17-07-18, 17:25 GMT ]
Post subject:  Re: #2) Mercury

--- update --

updated to use the de438.bsp file

Author:  t00fri [ Tue, 17-07-18, 19:00 GMT ]
Post subject:  Re: #2) Mercury


many thanks for your ongoing Spice update!

Do you have an idea how we might run precision tests for the current Spice accuracy once all has been installed ? That would be quite essential e.g. for celestia.Sci. Perhaps via Charon-Pluto eclipses as seen from Earth, the timings of which are pretty well known ?...Testing in the Jovian system would require the spice kernels for the Galilean moons besides Jupiter.

Any better ideas?


Author:  John Van Vliet [ Tue, 17-07-18, 21:01 GMT ]
Post subject:  Re: #2) Mercury

i have only so far updated the inner solar system

one check for the 438 bsp is to see if the pre and post spice orbits line up , a test i have not done yet

seeing this is just a normal spice update for the locations of barycenter and planet center

Author:  John Van Vliet [ Tue, 17-07-18, 21:31 GMT ]
Post subject:  Re: #2) Mercury

error fixed with the de438.bsp

--- fixed ---
just found an error with the new 433.bsp do to the use of PC and not barycenter

use the older 436.bsp for now

Author:  t00fri [ Wed, 18-07-18, 6:43 GMT ]
Post subject:  Re: #2) Mercury



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