******************************************************************************* JPL/HORIZONS Siding Spring (C/2013 A1) 2016-Apr-22 Rec #: n.a. Soln.date: 2016-Apr-22_14:11:17 # obs: 449 (2012-2016) NOTE: This trajectory was integrated off-line to include a non-gravitational gas-jet acceleration model, estimated from measurement data, as described in Farnocchia, et al (2015, solution #102) and updated in 2016 with twelve subsequent measurements (solution #105). Horizons is interpolating the trajectory data from a static, pre-computed file. Some quantities are therefore not available for output as a result of the file representation. If you require orbit uncertainties or more information, contact JPL. If an SPK file is needed, one may be retrieved here: ftp://ssd.jpl.nasa.gov/pub/xfr/c2013a1_s105_merged.bsp IAU76/J2000.0 helio. ecliptic osculating elements (au, days, degrees): EPOCH= 2457480.5 ! 2016-Apr-02.0 (TDB) RMSW= 0.1774 EC= 1.000085526301256 QR= 1.399764990633582 TP= 2456955.675811088666 OM= 300.9994099243701 W = 2.449169482138664 IN= 129.0329176101494 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 8.4864 M2= n.a. k1= 9. k2= n.a. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): (AJ1-AJ2=au/d^2;ET1-ET2=deg.;ALF=deg.;DEL=deg.;DTH=deg.) AMRAT= 0. DT= 0.0 A1= 0.0 A2= 0.0 A3= 0.0 AJ1= 8.332797598358188E-8 ET1= 57.84493936534588 AJ2= 1.857140671424592E-7 ET2= 149.0589506591809 ALF= 68.42599143656125 DEL= 17.23254921214774 DTH= 7.940553933291362 COMET comments 1: soln ref.= JPL#105, data arc: 2012-Oct-04 to 2016-Apr-17 2: k1=9.; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Thu Apr 25 05:47:15 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Siding Spring (1003228) {source: c2013a1_s105_merged} Center body name: Solar System Barycenter (0) {source: DE441} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 1950-Jan-01 00:00:00.0000 TDB Stop time : A.D. 2050-Jan-01 00:00:00.0000 TDB Step-size : 100 calendar years ******************************************************************************* 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) Keplerian GM : 2.9630927493968080E-04 au^3/d^2 Output units : AU-D, deg, Julian Day Number (Tp) Calendar mode : Mixed Julian/Gregorian Output type : GEOMETRIC osculating elements Output format : 10 Reference frame : Ecliptic of J2000.0 ******************************************************************************* JDTDB EC QR IN OM W Tp N MA TA A AD PR ******************************************************************************* $$SOE 2433282.500000000 = A.D. 1950-Jan-01 00:00:00.0000 TDB EC= 9.999462063653719E-01 QR= 1.402119469899812E+00 IN= 1.290044799844327E+02 OM= 3.009716827648344E+02 W = 2.409744331332233E+00 Tp= 2456956.002491294872 N = 2.343764968100735E-07 MA= 3.599944514874189E+02 TA= 1.943817076394232E+02 A = 2.606478405093981E+04 AD= 5.212816598240972E+04 PR= 1.535990190568149E+09 2469807.500000000 = A.D. 2050-Jan-01 00:00:00.0000 TDB EC= 9.997846907584290E-01 QR= 1.400374600175303E+00 IN= 1.289640146339002E+02 OM= 3.010395108173685E+02 W = 2.493746923593307E+00 Tp= 2456955.990107773803 N = 1.880281722901089E-06 MA= 2.416445916204949E-02 TA= 1.623094806311770E+02 A = 6.504015294257716E+03 AD= 1.300663021391526E+04 PR= 1.914606708214743E+08 $$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 [1 au= 149597870.700 km, 1 day= 86400.0 s]: JDTDB Julian Day Number, Barycentric Dynamical Time EC Eccentricity, e QR Periapsis distance, q (au) IN Inclination w.r.t X-Y plane, i (degrees) OM Longitude of Ascending Node, OMEGA, (degrees) W Argument of Perifocus, w (degrees) Tp Time of periapsis (Julian Day Number) N Mean motion, n (degrees/day) MA Mean anomaly, M (degrees) TA True anomaly, nu (degrees) A Semi-major axis, a (au) AD Apoapsis distance (au) PR Sidereal orbit period (day) ABERRATIONS AND CORRECTIONS Geometric osculating elements 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 ******************************************************************************* !$$SOF COMMAND = '2013 A1' TABLE_TYPE = 'ELEMENTS' START_TIME = '1950-01-01' STOP_TIME = '2050-01-01' STEP_SIZE = '100 years' CENTER = '@0' OUT_UNITS = 'AU-D'