******************************************************************************* JPL/HORIZONS Lemmon (C/2021 T4) 2024-May-06 07:08:17 Rec #:90004698 (+COV) Soln.date: 2024-Apr-29_13:12:18 # obs: 1935 (2021-2024) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2459991.5 ! 2023-Feb-16.0000000 (TDB) RMSW= n.a. EC= 1.000079645429152 QR= 1.483334896846756 TP= 2460157.0158690587 OM= 257.872536762289 W= 329.7996912315901 IN= 160.7760778884165 A= -18624.23132926656 MA= -6.4183910942667E-5 ADIST= 9.999999E99 PER= 9.999999E99 N= 3.88E-7 ANGMOM= .029629525 DAN= 1.59133 DDN= 21.86944 L= 286.6642807 B= -9.533621800000001 MOID= .497067 TP= 2023-Jul-31.5158690587 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 11.9 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= 0. A2= 0. A3= 2.365417480469E-9 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#76, data arc: 2021-08-07 to 2024-04-29 2: k1=4.5; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Mon May 6 07:08:17 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Lemmon (C/2021 T4) {source: JPL#76} Center body name: Solar System Barycenter (0) {source: DE441} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 1800-Jan-01 00:00:00.0000 TDB Stop time : A.D. 2200-Jan-01 00:00:00.0000 TDB Step-size : 400 calendar years ******************************************************************************* Center geodetic : 0.0, 0.0, 0.0 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)} Center radii : (undefined) Keplerian GM : 2.9630927493968080E-04 au^3/d^2 Small perturbers: Yes {source: SB441-N16} Output units : AU-D, deg, Julian Day Number (Tp) Calendar mode : Mixed Julian/Gregorian Output type : GEOMETRIC osculating elements Output format : 10 Reference frame : Ecliptic of J2000.0 ******************************************************************************* Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2459991.5 ! 2023-Feb-16.0000000 (TDB) RMSW= n.a. EC= 1.000079645429152 QR= 1.483334896846756 TP= 2460157.0158690587 OM= 257.872536762289 W= 329.7996912315901 IN= 160.7760778884165 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 2.461489661255370E+00 Y= 8.083144208599147E-01 Z=-5.215557781662032E-01 VX=-7.327636149623326E-03 VY=-1.250319200706491E-02 VZ=-3.732468272063531E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 11.9 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= 0. A2= 0. A3= 2.365417480469E-9 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* JDTDB EC QR IN OM W Tp N MA TA A AD PR ******************************************************************************* $$SOE 2378496.500000000 = A.D. 1800-Jan-01 00:00:00.0000 TDB EC= 9.999395643327874E-01 QR= 1.475515204878349E+00 IN= 1.607126682045223E+02 OM= 2.578062056131754E+02 W = 3.298439656711492E+02 Tp= 2460156.096138109919 N = 2.585352129876254E-07 MA= 3.599788881189199E+02 TA= 1.897006002455299E+02 A = 2.441464242777102E+04 AD= 4.882780934033717E+04 PR= 1.392460221723186E+09 2524593.500000000 = A.D. 2200-Jan-01 00:00:00.0000 TDB EC= 9.986443554424753E-01 QR= 1.486720205432667E+00 IN= 1.607798265688504E+02 OM= 2.578323964512966E+02 W = 3.296968606401691E+02 Tp= 2460155.844012975693 N = 2.715627149536751E-05 MA= 1.749886480508736E+00 TA= 1.697737299321238E+02 A = 1.096688801780832E+03 AD= 2.191890883356232E+03 PR= 1.325660630773304E+07 $$EOE ******************************************************************************* TIME Barycentric Dynamical Time ("TDB" or T_eph) output was requested. This continuous coordinate time is equivalent to the relativistic proper time of a clock at rest in a reference frame co-moving with the solar system barycenter but outside the system's gravity well. It is the independent variable in the solar system relativistic equations of motion. TDB runs at a uniform rate of one SI second per second and is independent of irregularities in Earth's rotation. 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. REFERENCE FRAME AND COORDINATES Ecliptic at the standard reference epoch Reference epoch: J2000.0 X-Y plane: adopted Earth orbital plane at the reference epoch Note: IAU76 obliquity of 84381.448 arcseconds wrt ICRF X-Y plane X-axis : ICRF Z-axis : perpendicular to the X-Y plane in the directional (+ or -) sense of Earth's north pole at the reference epoch. Symbol meaning [1 au= 149597870.700 km, 1 day= 86400.0 s]: JDTDB Julian Day Number, Barycentric Dynamical Time EC Eccentricity, e QR Periapsis distance, q (au) IN Inclination w.r.t X-Y plane, i (degrees) OM Longitude of Ascending Node, OMEGA, (degrees) W Argument of Perifocus, w (degrees) Tp Time of periapsis (Julian Day Number) N Mean motion, n (degrees/day) MA Mean anomaly, M (degrees) TA True anomaly, nu (degrees) A Semi-major axis, a (au) AD Apoapsis distance (au) PR Sidereal orbit period (day) ABERRATIONS AND CORRECTIONS Geometric osculating elements have NO corrections or aberrations applied. 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 = '2021 T4' TABLE_TYPE = 'ELEMENTS' START_TIME = '1800-01-01' STOP_TIME = '2200-01-01' STEP_SIZE = '400 years' CENTER = '@0' OUT_UNITS = 'AU-D'