******************************************************************************* JPL/HORIZONS 71P/Clark 2025-Dec-12 17:47:26 Rec #:90000728 (+COV) Soln.date: 2022-Mar-22_08:34:06 # obs: 1400 (2011-2018) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457163.5 ! 2015-May-21.0000000 (TDB) RMSW= n.a. EC= .4955129174670403 QR= 1.580931671716921 TP= 2457934.5674806023 OM= 59.55653744015697 W= 208.9885598684031 IN= 9.449230631898326 A= 3.133740637677544 MA= 223.0058925951059 ADIST= 4.686549603638166 PER= 5.5475698154472 N= .177668117 ANGMOM= .026450451 DAN= 4.17304 DDN= 1.6494 L= 268.2144849 B= -4.5635204 MOID= .57307202 TP= 2017-Jun-30.0674806023 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= .680 M1= 11.1 M2= 14.6 k1= 14.25 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= 65.31944 A1= 2.209280490875E-8 A2= -2.342285513878E-9 A3= -3.609778285027E-9 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#K172/5, data arc: 2011-01-28 to 2018-01-17 2: k1=14.25, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 17:47:26 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: 71P/Clark {source: JPL#K172/5} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1930-May-31 00:00:00.0000 UT Stop time : A.D. 1930-Jun-01 00:00:00.0000 UT Step-size : 60 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 0.68 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= 2457163.5 ! 2015-May-21.0000000 (TDB) RMSW= n.a. EC= .4955129174670403 QR= 1.580931671716921 TP= 2457934.5674806023 OM= 59.55653744015697 W= 208.9885598684031 IN= 9.449230631898326 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.179420443381826E+00 Y= 3.732898412676574E+00 Z= 2.198013462904443E+00 VX=-5.192721429142201E-03 VY=-3.119680207919879E-03 VZ=-8.340251139381320E-04 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= .680 M1= 11.1 M2= 14.6 k1= 14.25 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= 65.31944 A1= 2.209280490875E-8 A2= -2.342285513878E-9 A3= -3.609778285027E-9 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************** Date__(UT)__HR:MN r rdot delta deldot ******************************************************************************** $$SOE 1930-May-31 00:00 4.474117412196 -2.8898863 5.29365451310962 11.5249825 1930-May-31 01:00 4.474047866586 -2.8902666 5.29393170422900 11.5120241 1930-May-31 02:00 4.473978311821 -2.8906469 5.29420858347137 11.4990628 1930-May-31 03:00 4.473908747901 -2.8910272 5.29448515076578 11.4860986 1930-May-31 04:00 4.473839174827 -2.8914075 5.29476140604172 11.4731314 1930-May-31 05:00 4.473769592597 -2.8917879 5.29503734922912 11.4601613 1930-May-31 06:00 4.473700001213 -2.8921682 5.29531298025840 11.4471884 1930-May-31 07:00 4.473630400673 -2.8925485 5.29558829906041 11.4342126 1930-May-31 08:00 4.473560790979 -2.8929288 5.29586330556643 11.4212339 1930-May-31 09:00 4.473491172129 -2.8933092 5.29613799970828 11.4082524 1930-May-31 10:00 4.473421544125 -2.8936895 5.29641238141816 11.3952681 1930-May-31 11:00 4.473351906965 -2.8940698 5.29668645062872 11.3822811 1930-May-31 12:00 4.473282260650 -2.8944502 5.29696020727306 11.3692912 1930-May-31 13:00 4.473212605180 -2.8948305 5.29723365128475 11.3562986 1930-May-31 14:00 4.473142940555 -2.8952108 5.29750678259780 11.3433033 1930-May-31 15:00 4.473073266774 -2.8955912 5.29777960114665 11.3303052 1930-May-31 16:00 4.473003583838 -2.8959715 5.29805210686618 11.3173045 1930-May-31 17:00 4.472933891747 -2.8963518 5.29832429969172 11.3043010 1930-May-31 18:00 4.472864190500 -2.8967322 5.29859617955904 11.2912950 1930-May-31 19:00 4.472794480098 -2.8971125 5.29886774640434 11.2782862 1930-May-31 20:00 4.472724760541 -2.8974929 5.29913900016428 11.2652749 1930-May-31 21:00 4.472655031828 -2.8978732 5.29940994077593 11.2522609 1930-May-31 22:00 4.472585293959 -2.8982536 5.29968056817677 11.2392444 1930-May-31 23:00 4.472515546935 -2.8986339 5.29995088230474 11.2262253 1930-Jun-01 00:00 4.472445790755 -2.8990143 5.30022088309822 11.2132036 $$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 'delta deldot' = Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer. 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 ******************************************************************************** !$$SOF COMMAND = '90000728' QUANTITIES = '19,20' START_TIME = '1930-05-31' STEP_SIZE = '1 hour' STOP_TIME = '1930-06-01'