Satellite Ephemeris File Release Satellite Ephemeris: MAR097 Location: ssd.jpl.nasa.gov/pub/eph/satellites/nio/LINUX_PC/mar097.nio Size(nio): 463429632 bytes Enter SATEPHMERGE/13 19-Apr-2012 16:24:30.291 linked 24-May-2011 16:26:51 Merge of forward and back Fit to data MAR097.3 Ephemeris Version Number: 17 Timespan from JED 2415023.500(04-JAN-1900) to JED 2488071.500(03-JAN-2100) File Epoch Julian Date: 2447575.50 Master Interval: 4.0000 Days Equinox Reference Julian Date: 2451545.00 Planetary Ephemeris Number: DE-0424/LE-0424 Bodies on the File: Name Number GM NDIV NDEG Model Phobos 401 7.087546066894452E-04 16 15 SATORBINT Deimos 402 9.615569648120313E-05 8 15 SATORBINT Mars 499 4.282837362069909E+04 16 7 SATORBINT System 4.282837442560939E+04 Additional Constants on the File: AU 1.495978706996262E+08 RADIUS 3.396000000000000E+03 J402 1.956608644161255E-03 J403 3.147495502044837E-05 J404 -1.538684158075500E-05 J405 5.726838132552375E-06 J406 -4.855911997138415E-06 J407 -4.104248699958376E-06 J408 -5.956559226330613E-07 POLTIM 2.451545000000000E+06 ZACPL4 3.176808445956354E+02 ZDEPL4 5.288644035581287E+01 DACPL4 -1.061000000000000E-01 DDEPL4 -6.090000000000000E-02 WPL4 1.766304618256669E+02 WDP4 3.508919822600000E+02 GMB 4.035032363095674E+05 GM6 3.794058520000016E+07 GM5 1.267127648000003E+08 GMS 1.327124400409446E+11 J409 1.253363975517135E-06 J410 -3.330918862126270E-06 C40201 5.059272195139364E-10 S40201 -5.147009277292778E-11 C40202 -5.463224794135697E-05 S40202 3.158707724361160E-05 C40301 4.109090032246660E-06 S40301 2.719452675643503E-05 C40302 -5.447251395885167E-06 S40302 2.855970476290750E-06 C40303 4.888056849863661E-06 S40303 3.566177891809616E-06 C40401 3.999947537530113E-06 S40401 3.570249415447233E-06 C40402 -2.129908841685001E-07 S40402 -2.008184763796351E-06 C40403 3.858711198744610E-07 S40403 -1.154592388506631E-08 C40404 6.544820538570149E-09 S40404 -2.719922969620904E-07 C40501 4.142805937253578E-07 S40501 1.818130570108600E-06 C40502 -6.955834817020413E-07 S40502 -1.886872260655691E-07 C40503 1.094322223414943E-07 S40503 8.976174654506701E-09 C40504 -3.613124209643927E-08 S40504 -2.633398394977253E-08 C40505 -1.095648196953601E-08 S40505 9.306830494325348E-09 C40601 1.418130959981680E-06 S40601 -1.194714368923638E-06 C40602 1.071930993033025E-07 S40602 1.827658261048369E-07 C40603 1.981403352450276E-08 S40603 6.904474992092157E-09 C40604 3.817371692891542E-09 S40604 9.989041654259300E-09 C40605 1.337842123684313E-09 S40605 1.309802225642035E-09 C40606 6.435093524189051E-10 S40606 1.914711941702754E-10 401RAD 1.132000000000000E+01 401J02 1.056571048845342E-01 401C02_02 1.475359333353391E-02 401S02_02 0.000000000000000E+00 401LIB 1.386000000000000E+00 MARS_ANG11 3.379191830000000E+00 MARS_ANG21 0.000000000000000E+00 MARS_ANG12 2.467682669000000E+01 MARS_ANG22 0.000000000000000E+00 MARS_ANG13 8.196837223580000E+01 MARS_ANG23 -5.772329368900000E-06 MARS_ANG14 2.518937924240000E+01 MARS_ANG24 -3.111842783790000E-09 MARS_ANG15 1.333846200000000E+02 MARS_ANG25 3.508919853030000E+02 MARS_SPIN11 4.350000000000000E+02 MARS_SPIN21 -1.680000000000000E+02 MARS_SPIN12 -9.700000000000000E+01 MARS_SPIN22 -1.190000000000000E+02 MARS_SPIN13 -1.700000000000000E+01 MARS_SPIN23 -1.700000000000000E+01 MARS_SPIN14 -9.000000000000000E+00 MARS_SPIN24 -4.000000000000000E+00 MARS_REL1 -1.760000000000000E+02 MARS_REL2 -8.000000000000000E+00 MARS_REL3 -1.000000000000000E+00 MARS_COREFAC 7.000000000000001E-02 MARS_COREW -1.500000000000000E+00 MARS_NUT_I00 -1.400000000000000E+00 MARS_NUT_M11 -4.000000000000000E-01 MARS_NUT_M21 -6.326000000000000E+02 MARS_NUT_M12 0.000000000000000E+00 MARS_NUT_M22 -4.420000000000000E+01 MARS_NUT_M13 0.000000000000000E+00 MARS_NUT_M23 -4.000000000000000E+00 MARS_NUT_Q11 -4.910000000000000E+01 MARS_NUT_Q21 -1.045000000000000E+02 MARS_NUT_Q12 5.157000000000000E+02 MARS_NUT_Q22 1.097000000000000E+03 MARS_NUT_Q13 1.128000000000000E+02 MARS_NUT_Q23 2.401000000000000E+02 MARS_NUT_Q14 1.920000000000000E+01 MARS_NUT_Q24 4.090000000000000E+01 MARS_NUT_Q15 3.000000000000000E+00 MARS_NUT_Q25 6.500000000000000E+00 MARS_NUT_Q16 4.000000000000000E-01 MARS_NUT_Q26 1.000000000000000E+00 400K2 1.830000000000000E-01 400PSI 0.000000000000000E+00 401PSI -2.880128347837982E-01 Chebyshev interpolation error: 2.000 meters Release to: Horizons/NAIF Time: 28-Sep-2012 09:45:49 Preparer: R. A. Jacobson Comments: DDA Abstract below Revised Ephemerides of the Martian Satellites R. A. Jacobson (JPL/Caltech) Jacobson (2010 AJ 139, 668) developed our previous ephemerides for the Martian satellites by fitting numerically integrated orbits to observations through 2007. We included the Viking and Phobos_2 Doppler tracking data to provide information on the satellite GMs. We subsequently acquired the tracking data from three Phobos close approaches by the Mars Express spacecraft (Morley 2011 private comm.) and additional Mars Express imaging observations of Deimos through 2011 (Pasewaldt et al. 2012 A&A 525, A144). We also improved our numerical model by adopting the latest published Martian gravity field (Konopliv et al. 2011 Icarus 211, 401) and including the gravitational effect of the tides raised on Mars by the Sun as well as by the satellites. Moreover, we adopted the Phobos forced libration amplitude which was observed with the Mars Express imaging (Willner et al. 2010 Earth and Planetary Sci. Let. 294, 541). Our new ephemerides are based on our numerical model fit to all of satellite observations and spacecraft tracking data. Our fit determined the epoch states and GMs of the satellites, the Phobos gravitational harmonics J2 and C22, and the Martian tidal quality factor Q. Presented at the AAS Division of Dynamical Astronomy Meeting, Mt. Hood, Oregon, 6-10 May 2012.