******************************************************************************* JPL/HORIZONS Borisov (C/2019 Q4) 2025-Dec-12 17:51:31 Rec #:90004557 (+COV) Soln.date: 2024-Jun-24_15:49:04 # obs: 964 (2019-2020) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2458853.5 ! 2020-Jan-05.0000000 (TDB) RMSW= n.a. EC= 3.356475782676596 QR= 2.006520878500843 TP= 2458826.052845906 OM= 308.1477292269942 W= 209.1236864378081 IN= 44.05264247909138 A= -.8514922551937886 MA= 34.42947030737667 ADIST= 9.999999E99 PER= 9.999999E99 N= 1.254391264 ANGMOM= .050859365 DAN= -4.52423 DDN= 2.22307 L= 149.9695468 B= -19.7799936 MOID= 1.09291995 TP= 2019-Dec-08.5528459060 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 13.8 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= -65.1301 A1= 4.85958814621E-8 A2= 1.879898667336E-8 A3= 2.835503220558E-9 Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 0. R0= 1. COMET comments 1: soln ref.= JPL#54, data arc: 2019-02-24 to 2020-09-30 2: k1=4.5; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 17:51:31 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: Borisov (C/2019 Q4) {source: JPL#54} Center body name: Sun (10) {source: DE441} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 1991-Jan-01 00:00:00.0000 UT Stop time : A.D. 1991-Mar-01 00:00:00.0000 UT Step-size : 30 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= 2458853.5 ! 2020-Jan-05.0000000 (TDB) RMSW= n.a. EC= 3.356475782676596 QR= 2.006520878500843 TP= 2458826.052845906 OM= 308.1477292269942 W= 209.1236864378081 IN= 44.05264247909138 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.746422156220264E+00 Y= 7.994315507603348E-01 Z=-8.420898120636099E-01 VX=-3.266387554200373E-03 VY=-1.273246218308122E-02 VZ=-2.137606337596023E-02 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 13.8 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= -65.1301 A1= 4.85958814621E-8 A2= 1.879898667336E-8 A3= 2.835503220558E-9 Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 0. R0= 1. ********************************************************************************** Date__(UT)__HR:MN:SC.fff r rdot VmagSn VmagOb ********************************************************************************** $$SOE 1991-Jan-01 00:00:00.000 200.4639599544 -32.4243451 32.4273544 32.4273641 1991-Jan-02 23:12:00.000 200.4271269564 -32.4243520 32.4273616 32.4273712 1991-Jan-04 22:24:00.000 200.3902939155 -32.4243844 32.4273949 32.4274042 1991-Jan-06 21:36:00.000 200.3534608379 -32.4244167 32.4274280 32.4274372 1991-Jan-08 20:48:00.000 200.3166277235 -32.4244490 32.4274610 32.4274702 1991-Jan-10 20:00:00.000 200.2797945726 -32.4244812 32.4274940 32.4275031 1991-Jan-12 19:12:00.000 200.2429613851 -32.4245134 32.4275269 32.4275360 1991-Jan-14 18:24:00.000 200.2061281610 -32.4245456 32.4275598 32.4275689 1991-Jan-16 17:36:00.000 200.1692949004 -32.4245778 32.4275927 32.4276018 1991-Jan-18 16:48:00.000 200.1324616031 -32.4246100 32.4276256 32.4276348 1991-Jan-20 16:00:00.000 200.0956282692 -32.4246423 32.4276586 32.4276677 1991-Jan-22 15:12:00.000 200.0587948986 -32.4246746 32.4276916 32.4277007 1991-Jan-24 14:24:00.000 200.0219614913 -32.4247069 32.4277246 32.4277338 1991-Jan-26 13:36:00.000 199.9851280472 -32.4247393 32.4277576 32.4277668 1991-Jan-28 12:48:00.000 199.9482945664 -32.4247717 32.4277907 32.4277999 1991-Jan-30 12:00:00.000 199.9114610487 -32.4248041 32.4278238 32.4278331 1991-Feb-01 11:12:00.000 199.8746274941 -32.4248366 32.4278570 32.4278662 1991-Feb-03 10:24:00.000 199.8377939027 -32.4248691 32.4278901 32.4278994 1991-Feb-05 09:36:00.000 199.8009602743 -32.4249016 32.4279233 32.4279326 1991-Feb-07 08:48:00.000 199.7641266090 -32.4249341 32.4279565 32.4279658 1991-Feb-09 08:00:00.000 199.7272929067 -32.4249667 32.4279898 32.4279991 1991-Feb-11 07:12:00.000 199.6904591675 -32.4249992 32.4280230 32.4280323 1991-Feb-13 06:24:00.000 199.6536253912 -32.4250318 32.4280562 32.4280656 1991-Feb-15 05:36:00.000 199.6167915780 -32.4250643 32.4280895 32.4280988 1991-Feb-17 04:48:00.000 199.5799577278 -32.4250969 32.4281227 32.4281320 1991-Feb-19 04:00:00.000 199.5431238407 -32.4251294 32.4281560 32.4281652 1991-Feb-21 03:12:00.000 199.5062899166 -32.4251619 32.4281892 32.4281985 1991-Feb-23 02:24:00.000 199.4694559555 -32.4251945 32.4282225 32.4282317 1991-Feb-25 01:36:00.000 199.4326219574 -32.4252270 32.4282557 32.4282649 1991-Feb-27 00:48:00.000 199.3957879224 -32.4252596 32.4282889 32.4282981 1991-Mar-01 00:00:00.000 199.3589538504 -32.4252921 32.4283222 32.4283313 $$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 = '2I' QUANTITIES = '19,22' START_TIME = '1991-01-01' STEP_SIZE = '30' STOP_TIME = '1991-03-01'