API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Ephemeris / API_USER Tue Apr 23 15:15:56 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Earth (399) {source: DE441} Center body name: Voyager 1 (spacecraft) (-31) {source: VOYAGER_1_ST+REFIT2022_M} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 1977-Sep-18 18:00:00.0000 TDB Stop time : A.D. 1977-Sep-18 20:00:00.0000 TDB Step-size : 10 minutes ******************************************************************************* Center geodetic : 0.0, 0.0, 0.0 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)} Center radii : (undefined) Output units : KM-S Calendar mode : Mixed Julian/Gregorian Output type : GEOMETRIC cartesian states Output format : 6 (LT, range, and range-rate) Reference frame : Ecliptic of J2000.0 ******************************************************************************* JDTDB LT RG RR ******************************************************************************* $$SOE 2443405.250000000 = A.D. 1977-Sep-18 18:00:00.0000 TDB 3.872221832720090E+01 1.160862901152420E+07 1.006477632494801E+01 2443405.256944444 = A.D. 1977-Sep-18 18:10:00.0000 TDB 3.874236165698371E+01 1.161466782987210E+07 1.006461816567419E+01 2443405.263888889 = A.D. 1977-Sep-18 18:20:00.0000 TDB 3.876250467021510E+01 1.162070655332026E+07 1.006445999262513E+01 2443405.270833333 = A.D. 1977-Sep-18 18:30:00.0000 TDB 3.878264736686769E+01 1.162674518186049E+07 1.006430180583577E+01 2443405.277777778 = A.D. 1977-Sep-18 18:40:00.0000 TDB 3.880278974691394E+01 1.163278371548453E+07 1.006414360534106E+01 2443405.284722222 = A.D. 1977-Sep-18 18:50:00.0000 TDB 3.882293181032649E+01 1.163882215418417E+07 1.006398539117597E+01 2443405.291666667 = A.D. 1977-Sep-18 19:00:00.0000 TDB 3.884307355707798E+01 1.164486049795121E+07 1.006382716337558E+01 2443405.298611111 = A.D. 1977-Sep-18 19:10:00.0000 TDB 3.886321498714121E+01 1.165089874677750E+07 1.006366892197494E+01 2443405.305555556 = A.D. 1977-Sep-18 19:20:00.0000 TDB 3.888335610048896E+01 1.165693690065488E+07 1.006351066700915E+01 2443405.312500000 = A.D. 1977-Sep-18 19:30:00.0000 TDB 3.890349689709405E+01 1.166297495957520E+07 1.006335239851337E+01 2443405.319444444 = A.D. 1977-Sep-18 19:40:00.0000 TDB 3.892363737692959E+01 1.166901292353039E+07 1.006319411652280E+01 2443405.326388889 = A.D. 1977-Sep-18 19:50:00.0000 TDB 3.894377753996848E+01 1.167505079251234E+07 1.006303582107266E+01 2443405.333333333 = A.D. 1977-Sep-18 20:00:00.0000 TDB 3.896391738618385E+01 1.168108856651299E+07 1.006287751219822E+01 $$EOE ******************************************************************************* TIME Barycentric Dynamical Time ("TDB" or T_eph) output was requested. This continuous coordinate time is equivalent to the relativistic proper time of a clock at rest in a reference frame co-moving with the solar system barycenter but outside the system's gravity well. It is the independent variable in the solar system relativistic equations of motion. TDB runs at a uniform rate of one SI second per second and is independent of irregularities in Earth's rotation. CALENDAR SYSTEM Mixed calendar mode was active such that calendar dates after AD 1582-Oct-15 (if any) are in the modern Gregorian system. Dates prior to 1582-Oct-5 (if any) are in the Julian calendar system, which is automatically extended for dates prior to its adoption on 45-Jan-1 BC. The Julian calendar is useful for matching historical dates. The Gregorian calendar more accurately corresponds to the Earth's orbital motion and seasons. A "Gregorian-only" calendar mode is available if such physical events are the primary interest. REFERENCE FRAME AND COORDINATES Ecliptic at the standard reference epoch Reference epoch: J2000.0 X-Y plane: adopted Earth orbital plane at the reference epoch Note: IAU76 obliquity of 84381.448 arcseconds wrt ICRF X-Y plane X-axis : ICRF Z-axis : perpendicular to the X-Y plane in the directional (+ or -) sense of Earth's north pole at the reference epoch. Symbol meaning: JDTDB Julian Day Number, Barycentric Dynamical Time LT One-way down-leg Newtonian light-time (sec) RG Range; distance from coordinate center (km) RR Range-rate; radial velocity wrt coord. center (km/sec) ABERRATIONS AND CORRECTIONS Geometric state vectors have NO corrections or aberrations applied. Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA General site: https://ssd.jpl.nasa.gov/ Mailing list: https://ssd.jpl.nasa.gov/email_list.html System news : https://ssd.jpl.nasa.gov/horizons/news.html User Guide : https://ssd.jpl.nasa.gov/horizons/manual.html Connect : browser https://ssd.jpl.nasa.gov/horizons/app.html#/x API https://ssd-api.jpl.nasa.gov/doc/horizons.html command-line telnet ssd.jpl.nasa.gov 6775 e-mail/batch https://ssd.jpl.nasa.gov/ftp/ssd/hrzn_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov *******************************************************************************