******************************************************************************* JPL/HORIZONS Lemmon (C/2025 A6) 2025-Dec-12 18:17:36 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 18:17:36 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: Lemmon (C/2025 A6) {source: JPL#20} Center body name: Sun (10) {source: DE441} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 2025-Nov-08 12:54:00.0000 UT Stop time : A.D. 2025-Nov-08 13:00:00.0000 UT Step-size : 18 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= 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 ********************************************************************************** Date__(UT)__HR:MN:SC.fff r rdot VmagSn VmagOb ********************************************************************************** $$SOE 2025-Nov-08 12:54:00.000 0.529903232538 -0.0072856 57.7985784 57.7985785 2025-Nov-08 12:54:20.000 0.529903231592 -0.0068651 57.7985784 57.7985785 2025-Nov-08 12:54:40.000 0.529903230702 -0.0064446 57.7985785 57.7985786 2025-Nov-08 12:55:00.000 0.529903229869 -0.0060241 57.7985785 57.7985786 2025-Nov-08 12:55:20.000 0.529903229092 -0.0056036 57.7985786 57.7985786 2025-Nov-08 12:55:40.000 0.529903228371 -0.0051831 57.7985786 57.7985787 2025-Nov-08 12:56:00.000 0.529903227706 -0.0047626 57.7985786 57.7985787 2025-Nov-08 12:56:20.000 0.529903227097 -0.0043421 57.7985787 57.7985787 2025-Nov-08 12:56:40.000 0.529903226545 -0.0039216 57.7985787 57.7985788 2025-Nov-08 12:57:00.000 0.529903226049 -0.0035011 57.7985787 57.7985788 2025-Nov-08 12:57:20.000 0.529903225609 -0.0030806 57.7985787 57.7985788 2025-Nov-08 12:57:40.000 0.529903225225 -0.0026601 57.7985787 57.7985788 2025-Nov-08 12:58:00.000 0.529903224897 -0.0022396 57.7985787 57.7985788 2025-Nov-08 12:58:20.000 0.529903224626 -0.0018191 57.7985788 57.7985788 2025-Nov-08 12:58:40.000 0.529903224411 -0.0013986 57.7985788 57.7985788 2025-Nov-08 12:59:00.000 0.529903224252 -0.0009781 57.7985788 57.7985789 2025-Nov-08 12:59:20.000 0.529903224149 -0.0005576 57.7985788 57.7985789 2025-Nov-08 12:59:40.000 0.529903224103 -0.0001371 57.7985788 57.7985788 2025-Nov-08 13:00:00.000 0.529903224113 0.0002834 57.7985788 57.7985788 $$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 = '2025 A6' QUANTITIES = '19,22' START_TIME = '2025-11-08 12:54' STEP_SIZE = '18' STOP_TIME = '2025-11-08 13:00'