******************************************************************************* JPL/HORIZONS ISON (C/2012 S1) 2025-Dec-12 17:50:16 Rec #:90004181 (+COV) Soln.date: 2025-Nov-21_13:42:48 # obs: 6684 (2011-2013) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2456413.5 ! 2013-May-01.0000000 (TDB) RMSW= n.a. EC= 1.00000509491957 QR= .01246672509220626 TP= 2456625.2645311668 OM= 295.6865414817095 W= 345.5411966905318 IN= 62.16289620932959 A= -2446.893404476403 MA= -.001724386918197071ADIST= 9.999999E99 PER= 9.999999E99 N= 8.143E-6 ANGMOM= .002716272 DAN= .01267 DDN= .78735 L= 288.8208505 B= -12.7554438 MOID= .0229938 TP= 2013-Nov-28.7645311668 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 10.4 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= 8.537815093994E-8 A2= 5.695189237595E-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#57, data arc: 2011-09-30 to 2013-11-22 2: k1=4.5; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 17:50:16 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: ISON (C/2012 S1) {source: JPL#57} Center body name: Sun (10) {source: DE441} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 1801-Nov-01 00:00:00.0000 UT Stop time : A.D. 1801-Dec-31 00:00:00.0000 UT Step-size : 60 steps ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -695700.0 {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 : IAU_SUN {East-longitude positive} Center radii : 695700.0, 695700.0, 695700.0 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : None 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 n.a. , 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= 2456413.5 ! 2013-May-01.0000000 (TDB) RMSW= n.a. EC= 1.00000509491957 QR= .01246672509220626 TP= 2456625.2645311668 OM= 295.6865414817095 W= 345.5411966905318 IN= 62.16289620932959 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.445349738222006E+00 Y= 3.101113524187381E+00 Z= 1.865345564350600E+00 VX= 4.232981685901609E-03 VY=-9.600824088002148E-03 VZ=-6.472975964240551E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 10.4 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= 8.537815093994E-8 A2= 5.695189237595E-9 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ********************************************************************************** Date__(UT)__HR:MN:SC.fff r rdot VmagSn VmagOb ********************************************************************************** $$SOE 1801-Nov-01 00:00:00.000 200.0252726149 -2.9900102 2.9901215 2.9901605 1801-Nov-02 00:00:00.000 200.0235457132 -2.9900411 2.9901523 2.9901913 1801-Nov-03 00:00:00.000 200.0218187942 -2.9900708 2.9901820 2.9902209 1801-Nov-04 00:00:00.000 200.0200918581 -2.9901006 2.9902117 2.9902506 1801-Nov-05 00:00:00.000 200.0183649048 -2.9901303 2.9902414 2.9902802 1801-Nov-06 00:00:00.000 200.0166379343 -2.9901600 2.9902710 2.9903098 1801-Nov-07 00:00:00.000 200.0149109467 -2.9901897 2.9903006 2.9903393 1801-Nov-08 00:00:00.000 200.0131839419 -2.9902193 2.9903302 2.9903689 1801-Nov-09 00:00:00.000 200.0114569200 -2.9902489 2.9903598 2.9903984 1801-Nov-10 00:00:00.000 200.0097298811 -2.9902785 2.9903894 2.9904279 1801-Nov-11 00:00:00.000 200.0080028250 -2.9903081 2.9904189 2.9904574 1801-Nov-12 00:00:00.000 200.0062757519 -2.9903377 2.9904484 2.9904869 1801-Nov-13 00:00:00.000 200.0045486616 -2.9903673 2.9904779 2.9905163 1801-Nov-14 00:00:00.000 200.0028215543 -2.9903969 2.9905074 2.9905458 1801-Nov-15 00:00:00.000 200.0010944299 -2.9904264 2.9905368 2.9905753 1801-Nov-16 00:00:00.000 199.9993672884 -2.9904560 2.9905663 2.9906047 1801-Nov-17 00:00:00.000 199.9976401298 -2.9904856 2.9905958 2.9906342 1801-Nov-18 00:00:00.000 199.9959129542 -2.9905152 2.9906252 2.9906637 1801-Nov-19 00:00:00.000 199.9941857614 -2.9905449 2.9906547 2.9906933 1801-Nov-20 00:00:00.000 199.9924585515 -2.9905745 2.9906842 2.9907228 1801-Nov-21 00:00:00.000 199.9907313244 -2.9906042 2.9907137 2.9907524 1801-Nov-22 00:00:00.000 199.9890040802 -2.9906339 2.9907433 2.9907820 1801-Nov-23 00:00:00.000 199.9872768188 -2.9906637 2.9907729 2.9908117 1801-Nov-24 00:00:00.000 199.9855495403 -2.9906935 2.9908025 2.9908413 1801-Nov-25 00:00:00.000 199.9838222445 -2.9907233 2.9908321 2.9908710 1801-Nov-26 00:00:00.000 199.9820949315 -2.9907531 2.9908618 2.9909007 1801-Nov-27 00:00:00.000 199.9803676013 -2.9907829 2.9908914 2.9909304 1801-Nov-28 00:00:00.000 199.9786402538 -2.9908127 2.9909212 2.9909601 1801-Nov-29 00:00:00.000 199.9769128891 -2.9908425 2.9909509 2.9909898 1801-Nov-30 00:00:00.000 199.9751855073 -2.9908723 2.9909806 2.9910194 1801-Dec-01 00:00:00.000 199.9734581083 -2.9909020 2.9910102 2.9910490 1801-Dec-02 00:00:00.000 199.9717306921 -2.9909316 2.9910399 2.9910785 1801-Dec-03 00:00:00.000 199.9700032588 -2.9909612 2.9910695 2.9911080 1801-Dec-04 00:00:00.000 199.9682758085 -2.9909907 2.9910990 2.9911373 1801-Dec-05 00:00:00.000 199.9665483412 -2.9910200 2.9911285 2.9911666 1801-Dec-06 00:00:00.000 199.9648208570 -2.9910493 2.9911579 2.9911957 1801-Dec-07 00:00:00.000 199.9630933559 -2.9910784 2.9911872 2.9912247 1801-Dec-08 00:00:00.000 199.9613658380 -2.9911074 2.9912163 2.9912536 1801-Dec-09 00:00:00.000 199.9596383034 -2.9911363 2.9912454 2.9912824 1801-Dec-10 00:00:00.000 199.9579107521 -2.9911651 2.9912743 2.9913110 1801-Dec-11 00:00:00.000 199.9561831843 -2.9911938 2.9913031 2.9913396 1801-Dec-12 00:00:00.000 199.9544555999 -2.9912223 2.9913318 2.9913680 1801-Dec-13 00:00:00.000 199.9527279991 -2.9912507 2.9913604 2.9913963 1801-Dec-14 00:00:00.000 199.9510003819 -2.9912790 2.9913888 2.9914244 1801-Dec-15 00:00:00.000 199.9492727485 -2.9913072 2.9914172 2.9914525 1801-Dec-16 00:00:00.000 199.9475450988 -2.9913352 2.9914454 2.9914804 1801-Dec-17 00:00:00.000 199.9458174329 -2.9913632 2.9914734 2.9915082 1801-Dec-18 00:00:00.000 199.9440897509 -2.9913910 2.9915014 2.9915359 1801-Dec-19 00:00:00.000 199.9423620528 -2.9914187 2.9915292 2.9915635 1801-Dec-20 00:00:00.000 199.9406343388 -2.9914463 2.9915570 2.9915910 1801-Dec-21 00:00:00.000 199.9389066089 -2.9914738 2.9915846 2.9916184 1801-Dec-22 00:00:00.000 199.9371788631 -2.9915013 2.9916121 2.9916457 1801-Dec-23 00:00:00.000 199.9354511015 -2.9915286 2.9916396 2.9916729 1801-Dec-24 00:00:00.000 199.9337233241 -2.9915558 2.9916669 2.9917000 1801-Dec-25 00:00:00.000 199.9319955311 -2.9915829 2.9916941 2.9917270 1801-Dec-26 00:00:00.000 199.9302677224 -2.9916100 2.9917212 2.9917539 1801-Dec-27 00:00:00.000 199.9285398981 -2.9916369 2.9917483 2.9917807 1801-Dec-28 00:00:00.000 199.9268120582 -2.9916638 2.9917752 2.9918075 1801-Dec-29 00:00:00.000 199.9250842029 -2.9916906 2.9918021 2.9918341 1801-Dec-30 00:00:00.000 199.9233563322 -2.9917173 2.9918288 2.9918607 1801-Dec-31 00:00:00.000 199.9216284460 -2.9917439 2.9918555 2.9918872 $$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 'VmagSn VmagOb' = Magnitude of target centers' velocity with respect to the Sun ("VmagSn") and the observer ("VmagOb") at the time light left the target center to be observed (print time minus down-leg light-time). These are absolute values of the velocity vectors (total speeds) and do NOT indicate direction of motion. Units: 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 ********************************************************************************** !$$SOF CENTER = '@Sun' COMMAND = '2012 S1' QUANTITIES = '19,22' START_TIME = '1801-11-01' STEP_SIZE = '60' STOP_TIME = '1801-12-31'