******************************************************************************* JPL/HORIZONS 161P/Hartley-IRAS 2024-May-04 06:23:41 Rec #:90001099 (+COV) Soln.date: 2021-Apr-15_23:27:43 # obs: 335 (1983-2005) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2453190.5 ! 2004-Jul-04.0000000 (TDB) RMSW= n.a. EC= .8350880971909477 QR= 1.274829386138673 TP= 2453542.3505345765 OM= 1.398165371226708 W= 47.09145237546669 IN= 95.69805019936666 A= 7.730366119265318 MA= 343.865251715405 ADIST= 14.18590285239196 PER= 21.493557171106 N= .045856825 ANGMOM= .026310914 DAN= 1.49145 DDN= 5.42228 L= 355.3013825 B= 46.7877546 MOID= .448405 TP= 2005-Jun-20.8505345765 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 11.5 M2= 15. k1= 11.5 k2= 5. PHCOF= .030 COMET comments 1: soln ref.= JPL#60, data arc: 1983-11-23 to 2005-10-12 2: k1=11.5, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat May 4 06:23:41 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 161P/Hartley-IRAS {source: JPL#60} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2026-Nov-24 00:00:00.0000 UT Stop time : A.D. 2026-Nov-30 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.240503.p240727 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-03. PREDICTS-> 2024-JUL-26 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= 2453190.5 ! 2004-Jul-04.0000000 (TDB) RMSW= n.a. EC= .8350880971909477 QR= 1.274829386138673 TP= 2453542.3505345765 OM= 1.398165371226708 W= 47.09145237546669 IN= 95.69805019936666 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 1.137347722065211E+00 Y= 1.934873777426413E+00 Z=-3.413988895176102E+00 VX= 3.937169414875713E-03 VY=-4.563144704130237E-03 VZ= 8.381603043577247E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 11.5 M2= 15. k1= 11.5 k2= 5. PHCOF= .030 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2026-Nov-24 00:00 1.266121476115 -0.9402550 2026-Nov-24 03:00 1.266054805998 -0.9069026 2026-Nov-24 06:00 1.265990543734 -0.8735429 2026-Nov-24 09:00 1.265928689837 -0.8401762 2026-Nov-24 12:00 1.265869244804 -0.8068028 2026-Nov-24 15:00 1.265812209109 -0.7734230 2026-Nov-24 18:00 1.265757583209 -0.7400370 2026-Nov-24 21:00 1.265705367542 -0.7066451 2026-Nov-25 00:00 1.265655562527 -0.6732475 2026-Nov-25 03:00 1.265608168564 -0.6398445 2026-Nov-25 06:00 1.265563186031 -0.6064364 2026-Nov-25 09:00 1.265520615290 -0.5730235 2026-Nov-25 12:00 1.265480456683 -0.5396059 2026-Nov-25 15:00 1.265442710532 -0.5061841 2026-Nov-25 18:00 1.265407377140 -0.4727582 2026-Nov-25 21:00 1.265374456792 -0.4393285 2026-Nov-26 00:00 1.265343949752 -0.4058952 2026-Nov-26 03:00 1.265315856264 -0.3724588 2026-Nov-26 06:00 1.265290176556 -0.3390193 2026-Nov-26 09:00 1.265266910834 -0.3055771 2026-Nov-26 12:00 1.265246059286 -0.2721325 2026-Nov-26 15:00 1.265227622079 -0.2386857 2026-Nov-26 18:00 1.265211599363 -0.2052369 2026-Nov-26 21:00 1.265197991267 -0.1717865 2026-Nov-27 00:00 1.265186797901 -0.1383348 2026-Nov-27 03:00 1.265178019356 -0.1048819 2026-Nov-27 06:00 1.265171655704 -0.0714282 2026-Nov-27 09:00 1.265167706997 -0.0379739 2026-Nov-27 12:00 1.265166173267 -0.0045193 2026-Nov-27 15:00 1.265167054529 0.0289353 2026-Nov-27 18:00 1.265170350776 0.0623898 2026-Nov-27 21:00 1.265176061983 0.0958437 2026-Nov-28 00:00 1.265184188106 0.1292968 2026-Nov-28 03:00 1.265194729081 0.1627490 2026-Nov-28 06:00 1.265207684824 0.1961998 2026-Nov-28 09:00 1.265223055234 0.2296491 2026-Nov-28 12:00 1.265240840188 0.2630965 2026-Nov-28 15:00 1.265261039546 0.2965418 2026-Nov-28 18:00 1.265283653146 0.3299848 2026-Nov-28 21:00 1.265308680809 0.3634251 2026-Nov-29 00:00 1.265336122336 0.3968625 2026-Nov-29 03:00 1.265365977508 0.4302968 2026-Nov-29 06:00 1.265398246088 0.4637276 2026-Nov-29 09:00 1.265432927819 0.4971547 2026-Nov-29 12:00 1.265470022425 0.5305778 2026-Nov-29 15:00 1.265509529610 0.5639967 2026-Nov-29 18:00 1.265551449058 0.5974111 2026-Nov-29 21:00 1.265595780438 0.6308207 2026-Nov-30 00:00 1.265642523394 0.6642252 $$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 ******************************************************************************* !$$SOF COMMAND = '161P' START_TIME = '2026-Nov-24' STOP_TIME = '2026-Nov-30' STEP_SIZE = '3 hours' QUANTITIES = '19'