******************************************************************************* Revised: Apr 21, 2022 Mars Reconnaisance Orbiter (MRO) / (Sun) -74 http://marsprogram.jpl.nasa.gov/mro/ NOTE (2014-Jun-10): C/2013 A1 (Siding Spring) will have its closest approach to Mars on Oct 19, 2014 at a distance of about 135,000 km. Location of predicted MRO minimum risk from comet particles (occultation mid-point): Latitude: 7.6083 deg Time: 19-OCT-2014 20:08:07.182392952 ET (CSS CA + 98 min) MISSION LAUNCH DATE: MARS ARRIVAL DATE: Aug 12, 2005 11:43 UTC (it's up and away) March 10, 2006 Notes: Aug 10, 2005: Original launch was scrubbed (gyros) Aug 11, 2005: Second attemped was launch scrubbed (fueling sensors) LAUNCH VEHICLE: Atlas V two-stage. Separation from Centaur: 2005-Aug-12 12:40:51.68 UTC BACKGROUND: MRO aerobraked for 6 months from the post-insertion 35 hour orbit, saving 450 kg of fuel. Primary science phase starts in November of 2006 and nominally operates for 2 Earth years from a 112 minute, near circular polar orbit. SPACECRAFT PHYSICAL PROPERTIES: Height= 6.5 m Solar panels = 20 m^2 Width = 13.6 m (tip-to-tip) launch weight= 2180 kg SPACECRAFT TRAJECTORY: Trajectory starts after Centaur launch stage separation (cruise phase). Trajectory after 2022-Apr-21 is PREDICTION. Trajectory files (from MRO Nav., JPL) Start (TDB) End (TDB) -------------------------------------- ----------------- ----------------- mro_cruise 2005-Aug-12 12:42 2006-Mar-10 22:06 mro_ab 2006-Mar-10 22:06 2006-Sep-12 06:40 misc reconstruction (mro_psp1-62) 2006-Sep-12 06:40 2022-Apr-01 01:01 mro_psp_rec 2022-Apr-01 01:01 2022-Apr-17 16:34 mro_psp 2022-Apr-17 16:34 2022-Sep-02 02:55 ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Mon May 23 05:19:05 2022 Pasadena, USA / Horizons ******************************************************************************* Target body name: Mars Reconnaissance Orbiter (spacecraft) (-74) {source: MRO_MERGED} Center body name: Mars Barycenter (4) {source: DE441} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 2022-May-22 00:00:00.0000 TDB Stop time : A.D. 2022-May-23 00:00:00.0000 TDB Step-size : 720 minutes ******************************************************************************* Center geodetic : 0.00000000,0.00000000,0.0000000 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.00000000,0.00000000,0.0000000 {E-lon(deg),Dxy(km),Dz(km)} Center radii : (undefined) Output units : KM-S Output type : GEOMETRIC cartesian states Output format : 1 (position only) Reference frame : Ecliptic of J2000.0 ******************************************************************************* JDTDB X Y Z ******************************************************************************* $$SOE 2459721.500000000 = A.D. 2022-May-22 00:00:00.0000 TDB 2.615353755143860E+03 5.410112782583881E+02 -2.491150185148976E+03 2459722.000000000 = A.D. 2022-May-22 12:00:00.0000 TDB -3.495159540344693E+03 -5.551069096048225E+02 9.252465537814477E+02 2459722.500000000 = A.D. 2022-May-23 00:00:00.0000 TDB 3.491185350937938E+03 4.083500559468409E+02 1.096540860137564E+03 $$EOE ******************************************************************************* TIME Barycentric Dynamical Time ("TDB" or T_eph) output was requested. This continuous relativistic coordinate time is equivalent to the relativistic proper time of a clock at rest in a reference frame comoving 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 dates prior to 1582-Oct-15 are in the Julian calendar system. Later calendar dates are in the Gregorian system. 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 X X-component of position vector (km) Y Y-component of position vector (km) Z Z-component of position vector (km) 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 *******************************************************************************