API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 103P/Hartley 2 2025-Dec-12 17:58:43 Rec #:90000956 (+COV) Soln.date: 2025-May-01_10:45:38 # obs: 8768 (2008-2025) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457152.5 ! 2015-May-10.0000000 (TDB) RMSW= n.a. EC= .6935978573940613 QR= 1.064947369015373 TP= 2457863.957983132 OM= 219.7421743331336 W= 181.3218438419628 IN= 13.59946797122405 A= 3.475652487146584 MA= 251.7821727283165 ADIST= 5.886357605277794 PER= 6.4798167304528 N= .152107123 ANGMOM= .023102058 DAN= 5.88281 DDN= 1.06506 L= 41.0269705 B= -.3107832 MOID= .0732373 TP= 2017-Apr-20.4579831320 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= .800 M1= 16. 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= 12.23374 A1= 1.384525597095E-9 A2= 1.464430894703E-10 A3= 1.812240295112E-10 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#K233/5, data arc: 2008-05-05 to 2025-04-28 2: k1=4.5; ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Fri Dec 12 17:58:43 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: 103P/Hartley 2 {source: JPL#K233/5} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2030-Apr-03 00:00:00.0000 UT Stop time : A.D. 2030-Apr-08 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 0.8 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.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= 2457152.5 ! 2015-May-10.0000000 (TDB) RMSW= n.a. EC= .6935978573940613 QR= 1.064947369015373 TP= 2457863.957983132 OM= 219.7421743331336 W= 181.3218438419628 IN= 13.59946797122405 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-2.587271773317512E+00 Y=-4.299320078989071E+00 Z=-1.388418539171043E+00 VX= 5.270405685456616E-03 VY= 1.531480138817955E-04 VZ= 8.572362243937557E-04 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= .800 M1= 16. 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= 12.23374 A1= 1.384525597095E-9 A2= 1.464430894703E-10 A3= 1.812240295112E-10 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2030-Apr-03 00:00 1.068612106048 -0.7784781 2030-Apr-03 03:00 1.068557306109 -0.7396540 2030-Apr-03 06:00 1.068505309352 -0.7008212 2030-Apr-03 09:00 1.068456116384 -0.6619803 2030-Apr-03 12:00 1.068409727777 -0.6231316 2030-Apr-03 15:00 1.068366144073 -0.5842757 2030-Apr-03 18:00 1.068325365778 -0.5454130 2030-Apr-03 21:00 1.068287393368 -0.5065439 2030-Apr-04 00:00 1.068252227285 -0.4676689 2030-Apr-04 03:00 1.068219867939 -0.4287884 2030-Apr-04 06:00 1.068190315707 -0.3899030 2030-Apr-04 09:00 1.068163570933 -0.3510129 2030-Apr-04 12:00 1.068139633929 -0.3121188 2030-Apr-04 15:00 1.068118504973 -0.2732211 2030-Apr-04 18:00 1.068100184312 -0.2343201 2030-Apr-04 21:00 1.068084672158 -0.1954164 2030-Apr-05 00:00 1.068071968692 -0.1565105 2030-Apr-05 03:00 1.068062074062 -0.1176027 2030-Apr-05 06:00 1.068054988382 -0.0786935 2030-Apr-05 09:00 1.068050711735 -0.0397834 2030-Apr-05 12:00 1.068049244169 -0.0008729 2030-Apr-05 15:00 1.068050585700 0.0380377 2030-Apr-05 18:00 1.068054736313 0.0769478 2030-Apr-05 21:00 1.068061695958 0.1158570 2030-Apr-06 00:00 1.068071464552 0.1547648 2030-Apr-06 03:00 1.068084041981 0.1936708 2030-Apr-06 06:00 1.068099428097 0.2325746 2030-Apr-06 09:00 1.068117622719 0.2714756 2030-Apr-06 12:00 1.068138625633 0.3103735 2030-Apr-06 15:00 1.068162436595 0.3492677 2030-Apr-06 18:00 1.068189055323 0.3881579 2030-Apr-06 21:00 1.068218481508 0.4270435 2030-Apr-07 00:00 1.068250714804 0.4659241 2030-Apr-07 03:00 1.068285754834 0.5047993 2030-Apr-07 06:00 1.068323601188 0.5436686 2030-Apr-07 09:00 1.068364253423 0.5825316 2030-Apr-07 12:00 1.068407711065 0.6213877 2030-Apr-07 15:00 1.068453973604 0.6602366 2030-Apr-07 18:00 1.068503040501 0.6990778 2030-Apr-07 21:00 1.068554911183 0.7379108 2030-Apr-08 00:00 1.068609585043 0.7767352 $$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 *******************************************************************************