API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 51P-A/Harrington 2024-May-02 00:42:08 Rec #:90000594 (+COV) Soln.date: 2016-Feb-23_16:13:17 # obs: 246 (1994-2015) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2451677.5 ! 2000-May-13.0000000 (TDB) RMSW= n.a. EC= .5620663599153678 QR= 1.568096864999769 TP= 2452066.1933476874 OM= 119.1877795469232 W= 233.587839407905 IN= 8.654956945930117 A= 3.580672324457031 MA= 303.4588923007594 ADIST= 5.593247783914293 PER= 6.7757140820375 N= .145464562 ANGMOM= .026922639 DAN= 3.67588 DDN= 1.83669 L= 352.4616269 B= -6.9558459 MOID= .58170003 TP= 2001-Jun-05.6933476874 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 2.4 M1= 10.6 M2= 15.1 k1= 15. k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 2.625456571579E-8 A2= 3.101463317871E-9 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#8, data arc: 1994-09-10 to 2015-06-25 2: k1=15., k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Thu May 2 00:42:08 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 51P-A/Harrington {source: JPL#8} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2022-Oct-02 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 : 2.4 km 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= 2451677.5 ! 2000-May-13.0000000 (TDB) RMSW= n.a. EC= .5620663599153678 QR= 1.568096864999769 TP= 2452066.1933476874 OM= 119.1877795469232 W= 233.587839407905 IN= 8.654956945930117 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-2.257717034329483E+00 Y=-2.653305587281499E+00 Z=-6.068464511078981E-01 VX= 9.075936068832667E-03 VY=-4.980423852556540E-04 VZ=-1.446960546420133E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 2.4 M1= 10.6 M2= 15.1 k1= 15. k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 2.625456571579E-8 A2= 3.101463317871E-9 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2022-Oct-02 00:00 1.692508056237 -0.1741198 2022-Oct-02 02:00 1.692499871312 -0.1660135 2022-Oct-02 04:00 1.692492076532 -0.1579070 2022-Oct-02 06:00 1.692484671905 -0.1498002 2022-Oct-02 08:00 1.692477657442 -0.1416934 2022-Oct-02 10:00 1.692471033148 -0.1335863 2022-Oct-02 12:00 1.692464799031 -0.1254791 2022-Oct-02 14:00 1.692458955100 -0.1173718 2022-Oct-02 16:00 1.692453501359 -0.1092643 2022-Oct-02 18:00 1.692448437816 -0.1011567 2022-Oct-02 20:00 1.692443764476 -0.0930490 2022-Oct-02 22:00 1.692439481345 -0.0849412 2022-Oct-03 00:00 1.692435588427 -0.0768333 2022-Oct-03 02:00 1.692432085726 -0.0687253 2022-Oct-03 04:00 1.692428973248 -0.0606172 2022-Oct-03 06:00 1.692426250995 -0.0525090 2022-Oct-03 08:00 1.692423918970 -0.0444008 2022-Oct-03 10:00 1.692421977176 -0.0362926 2022-Oct-03 12:00 1.692420425616 -0.0281842 2022-Oct-03 14:00 1.692419264291 -0.0200759 2022-Oct-03 16:00 1.692418493203 -0.0119675 2022-Oct-03 18:00 1.692418112353 -0.0038591 2022-Oct-03 20:00 1.692418121740 0.0042493 2022-Oct-03 22:00 1.692418521366 0.0123576 2022-Oct-04 00:00 1.692419311230 0.0204660 2022-Oct-04 02:00 1.692420491330 0.0285744 2022-Oct-04 04:00 1.692422061667 0.0366827 2022-Oct-04 06:00 1.692424022238 0.0447910 2022-Oct-04 08:00 1.692426373040 0.0528993 2022-Oct-04 10:00 1.692429114073 0.0610075 2022-Oct-04 12:00 1.692432245332 0.0691156 2022-Oct-04 14:00 1.692435766814 0.0772236 2022-Oct-04 16:00 1.692439678516 0.0853316 2022-Oct-04 18:00 1.692443980432 0.0934395 2022-Oct-04 20:00 1.692448672559 0.1015473 2022-Oct-04 22:00 1.692453754892 0.1096549 2022-Oct-05 00:00 1.692459227424 0.1177625 $$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 *******************************************************************************