API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 129P/Shoemaker-Levy 3 2025-Dec-12 17:59:24 Rec #:90001042 (+COV) Soln.date: 2025-Jun-27_14:17:32 # obs: 720 (2002-2025) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2456480.5 ! 2013-Jul-07.0000000 (TDB) RMSW= n.a. EC= .09063771161848871 QR= 3.913588667158151 TP= 2456698.6053654668 OM= 185.1562747183833 W= 309.1329714845262 IN= 3.432831417729866 A= 4.303662816415645 MA= 335.9224071331397 ADIST= 4.693736965673138 PER= 8.9282338951736 N= .110394317 ANGMOM= .035539334 DAN= 4.03736 DDN= 4.52728 L= 134.3396298 B= -2.6621551 MOID= 2.92763996 TP= 2014-Feb-10.1053654668 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 14.4 M2= n.a. k1= 4.5 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= 1.216310858727E-9 A2= -2.583903074265E-10 A3= 0. Non-standard or simulated/proxy model: ALN= .04083733261 NK= 2.6 NM= 2. NN= 3. R0= 5. COMET comments 1: soln ref.= JPL#K223/34, data arc: 2002-11-04 to 2025-05-27 2: k1=4.5;Nongrav. accels. using CO driven g(r) ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Fri Dec 12 17:59:24 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: 129P/Shoemaker-Levy 3 {source: JPL#K223/34} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2031-Nov-05 00:00:00.0000 UT Stop time : A.D. 2031-Nov-06 00:00:00.0000 UT Step-size : 180 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.251212.p260310 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-DEC-12. PREDICTS-> 2026-MAR-09 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= 2456480.5 ! 2013-Jul-07.0000000 (TDB) RMSW= n.a. EC= .09063771161848871 QR= 3.913588667158151 TP= 2456698.6053654668 OM= 185.1562747183833 W= 309.1329714845262 IN= 3.432831417729866 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.055655381214349E+00 Y= 3.582371525297577E+00 Z= 1.299269090198899E+00 VX=-8.564295689507121E-03 VY=-2.567850152732161E-03 VZ=-9.847053682856073E-04 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 14.4 M2= n.a. k1= 4.5 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= 1.216310858727E-9 A2= -2.583903074265E-10 A3= 0. Non-standard or simulated/proxy model: ALN= .04083733261 NK= 2.6 NM= 2. NN= 3. R0= 5. ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2031-Nov-05 00:00 3.933368304350 -0.0015420 2031-Nov-05 03:00 3.933368205615 -0.0011931 2031-Nov-05 06:00 3.933368132069 -0.0008442 2031-Nov-05 09:00 3.933368083712 -0.0004953 2031-Nov-05 12:00 3.933368060544 -0.0001465 2031-Nov-05 15:00 3.933368062564 0.0002024 2031-Nov-05 18:00 3.933368089773 0.0005513 2031-Nov-05 21:00 3.933368142170 0.0009002 2031-Nov-06 00:00 3.933368219756 0.0012490 $$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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov *******************************************************************************