API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 51P-D/Harrington 2024-May-02 06:17:04 Rec #:90000596 (+COV) Soln.date: 2023-May-04_09:44:41 # obs: 142 (2015-2022) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2458624.5 ! 2019-May-21.0000000 (TDB) RMSW= n.a. EC= .542449283991264 QR= 1.697254316817907 TP= 2459855.2080084924 OM= 83.68268363141401 W= 269.2318496152992 IN= 5.425130539472045 A= 3.709434293149487 MA= 190.2156811697246 ADIST= 5.721614269481067 PER= 7.1444652172891 N= .137956621 ANGMOM= .027833021 DAN= 2.63711 DDN= 2.59903 L= 352.9110773 B= -5.4246415 MOID= .70341003 TP= 2022-Oct-02.7080084924 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 18.5 M2= n.a. k1= 5.75 k2= n.a. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 0. A2= 1.426904916763E-8 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#K222/5, data arc: 2015-05-30 to 2022-11-21 2: k1=5.75; ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Thu May 2 06:17:05 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 51P-D/Harrington {source: JPL#K222/5} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2022-Oct-01 00:00:00.0000 UT Stop time : A.D. 2022-Oct-05 00:00:00.0000 UT Step-size : 120 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -6378.137 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : ITRF93 {East-longitude positive} Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441} Rel. light bend : Sun {source: DE441} Rel. lght bnd GM: 1.3271E+11 km^3/s^2 Small-body perts: Yes {source: SB441-N16} Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Calendar mode : Mixed Julian/Gregorian EOP file : eop.240501.p240725 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-01. PREDICTS-> 2024-JUL-24 Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO ) Table cut-offs 2: Solar elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO ) Table cut-offs 3: RA/DEC angular rate ( 0.0=NO ) ******************************************************************************* Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2458624.5 ! 2019-May-21.0000000 (TDB) RMSW= n.a. EC= .542449283991264 QR= 1.697254316817907 TP= 2459855.2080084924 OM= 83.68268363141401 W= 269.2318496152992 IN= 5.425130539472045 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-5.672301422306630E+00 Y= 1.002344890460535E-01 Z= 6.309488160663212E-01 VX= 6.470931884344799E-05 VY=-4.462601095396478E-03 VZ=-1.997114448406544E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 18.5 M2= n.a. k1= 5.75 k2= n.a. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 0. A2= 1.426904916763E-8 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2022-Oct-01 00:00 1.692428123876 -0.0738417 2022-Oct-01 02:00 1.692424765116 -0.0657349 2022-Oct-01 04:00 1.692421796519 -0.0576281 2022-Oct-01 06:00 1.692419218090 -0.0495212 2022-Oct-01 08:00 1.692417029831 -0.0414142 2022-Oct-01 10:00 1.692415231744 -0.0333071 2022-Oct-01 12:00 1.692413823833 -0.0252001 2022-Oct-01 14:00 1.692412806098 -0.0170930 2022-Oct-01 16:00 1.692412178540 -0.0089858 2022-Oct-01 18:00 1.692411941161 -0.0008787 2022-Oct-01 20:00 1.692412093961 0.0072285 2022-Oct-01 22:00 1.692412636940 0.0153356 2022-Oct-02 00:00 1.692413570097 0.0234427 2022-Oct-02 02:00 1.692414893432 0.0315498 2022-Oct-02 04:00 1.692416606943 0.0396569 2022-Oct-02 06:00 1.692418710628 0.0477639 2022-Oct-02 08:00 1.692421204485 0.0558709 2022-Oct-02 10:00 1.692424088511 0.0639778 2022-Oct-02 12:00 1.692427362704 0.0720847 2022-Oct-02 14:00 1.692431027059 0.0801915 2022-Oct-02 16:00 1.692435081573 0.0882982 2022-Oct-02 18:00 1.692439526242 0.0964048 2022-Oct-02 20:00 1.692444361060 0.1045112 2022-Oct-02 22:00 1.692449586022 0.1126176 2022-Oct-03 00:00 1.692455201122 0.1207239 2022-Oct-03 02:00 1.692461206356 0.1288300 2022-Oct-03 04:00 1.692467601714 0.1369360 2022-Oct-03 06:00 1.692474387192 0.1450418 2022-Oct-03 08:00 1.692481562781 0.1531475 2022-Oct-03 10:00 1.692489128473 0.1612530 2022-Oct-03 12:00 1.692497084260 0.1693584 2022-Oct-03 14:00 1.692505430134 0.1774635 2022-Oct-03 16:00 1.692514166084 0.1855685 2022-Oct-03 18:00 1.692523292103 0.1936732 2022-Oct-03 20:00 1.692532808178 0.2017777 2022-Oct-03 22:00 1.692542714301 0.2098821 2022-Oct-04 00:00 1.692553010459 0.2179861 2022-Oct-04 02:00 1.692563696642 0.2260900 2022-Oct-04 04:00 1.692574772838 0.2341936 2022-Oct-04 06:00 1.692586239035 0.2422969 2022-Oct-04 08:00 1.692598095219 0.2504000 2022-Oct-04 10:00 1.692610341379 0.2585028 2022-Oct-04 12:00 1.692622977499 0.2666053 2022-Oct-04 14:00 1.692636003567 0.2747075 2022-Oct-04 16:00 1.692649419568 0.2828095 2022-Oct-04 18:00 1.692663225486 0.2909111 2022-Oct-04 20:00 1.692677421308 0.2990123 2022-Oct-04 22:00 1.692692007016 0.3071133 2022-Oct-05 00:00 1.692706982596 0.3152139 $$EOE ******************************************************************************* Column meaning: TIME Times PRIOR to 1962 are UT1, a mean-solar time closely related to the prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1 using integer leap-seconds for 1972 and later years. Conversion from the internal Barycentric Dynamical Time (TDB) of solar system dynamics to the non-uniform civil UT time-scale requested for output has not been determined for UTC times after the next July or January 1st. Therefore, the last known leap-second is used as a constant over future intervals. Time tags refer to the UT time-scale conversion from TDB on Earth regardless of observer location within the solar system, although clock rates may differ due to the local gravity field and no analog to "UT" may be defined for that location. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. 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. NOTE: "n.a." in output means quantity "not available" at the print-time. 'r rdot' = The Sun's apparent range ("r", light-time aberrated) and range-rate ("rdot") relative to the target center, as seen by the observer. A positive "rdot" means the target center was moving away from the Sun, negative means moving toward the Sun. Units: AU and KM/S 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 *******************************************************************************