******************************************************************************* JPL/HORIZONS Lemmon (C/2025 A6) 2025-Dec-12 17:47:06 Rec #:90004896 (+COV) Soln.date: 2025-Dec-12_11:12:31 # obs: 1610 (2024-2025) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2460930.5 ! 2025-Sep-12.0000000 (TDB) RMSW= n.a. EC= .9956136821335816 QR= .5298887175088707 TP= 2460988.0385696311 OM= 108.0977800349062 W= 132.9703509586263 IN= 143.6636934611868 A= 120.8049059931774 MA= 359.957289340473 ADIST= 241.079923268846 PER= 1327.8073240731 N= .000742296 ANGMOM= .017689356 DAN= 3.29045 DDN= .62995 L= 328.9492773 B= 25.693286 MOID= .30768001 TP= 2025-Nov-08.5385696311 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 10.6 M2= n.a. k1= 11.25 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= 2.46502661705E-8 A2= -3.703544437885E-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#20, data arc: 2024-11-12 to 2025-11-19 2: k1=11.25; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 17:47:06 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: Lemmon (C/2025 A6) {source: JPL#20} 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= 2460930.5 ! 2025-Sep-12.0000000 (TDB) RMSW= n.a. EC= .9956136821335816 QR= .5298887175088707 TP= 2460988.0385696311 OM= 108.0977800349062 W= 132.9703509586263 IN= 143.6636934611868 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 1.826941295967608E-01 Y= 9.669455394597328E-01 Z= 8.650778893235875E-01 VX= 8.717714144311904E-03 VY=-1.833210643040876E-02 VZ=-6.097419919552803E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 10.6 M2= n.a. k1= 11.25 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= 2.46502661705E-8 A2= -3.703544437885E-9 A3= 0. 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 ******************************************************************************* $$SOE 2378496.500000000 = A.D. 1800-Jan-01 00:00:00.0000 TDB EC= 9.956902633766910E-01 QR= 5.253658024474700E-01 IN= 1.435831260383905E+02 OM= 1.081755340025493E+02 W = 1.331358573108973E+02 Tp= 2460987.623379526660 N = 7.327885098816859E-04 MA= 2.995514526202503E+02 TA= 1.835253386990249E+02 A = 1.219020669629929E+02 AD= 2.432787681235384E+02 PR= 4.912740785989189E+05 2524593.500000000 = A.D. 2200-Jan-01 00:00:00.0000 TDB EC= 9.950713411219991E-01 QR= 5.328132470082814E-01 IN= 1.436561978174088E+02 OM= 1.081008738663489E+02 W = 1.329730710216937E+02 Tp= 2460987.592445663642 N = 8.774570661972854E-04 MA= 5.581145303544355E+01 TA= 1.759794693397610E+02 A = 1.081051174765792E+02 AD= 2.156774217061502E+02 PR= 4.102764840223629E+05 $$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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov ******************************************************************************* !$$SOF CENTER = '@0' COMMAND = '2025 A6' OUT_UNITS = 'AU-D' START_TIME = '1800-01-01' STEP_SIZE = '400 years' STOP_TIME = '2200-01-01' TABLE_TYPE = 'ELEMENTS'