******************************************************************************* JPL/HORIZONS Borisov (C/2019 Q4) 2024-Apr-27 05:20:22 Rec #:90004534 (+COV) Soln.date: 2020-Aug-21_09:32:58 # obs: 1428 (2019-2020) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2459062.5 ! 2020-Aug-01.0000000 (TDB) RMSW= n.a. EC= 3.356215101434632 QR= 2.006581893840375 TP= 2458826.0450702133 OM= 308.1487262895379 W= 209.12367864468 IN= 44.05257068647377 A= -.8516123560275226 MA= -63.45574427083102 ADIST= 9.999999E99 PER= 9.999999E99 N= 1.254125917 ANGMOM= .050858617 DAN= -4.52463 DDN= 2.22313 L= 149.9705615 B= -19.7799618 MOID= 1.09389997 TP= 2019-Dec-08.5450702133 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 13.7 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= 87.2916 A1= 7.093444347382E-8 A2= -1.443811535835E-8 A3= 6.534734368324E-10 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#53, data arc: 2019-08-30 to 2020-07-06 2: k1=4.5; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat Apr 27 05:20:23 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Borisov (C/2019 Q4) {source: JPL#53} 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.240426.p240720 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-26. PREDICTS-> 2024-JUL-19 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= 2459062.5 ! 2020-Aug-01.0000000 (TDB) RMSW= n.a. EC= 3.356215101434632 QR= 2.006581893840375 TP= 2458826.0450702133 OM= 308.1487262895379 W= 209.12367864468 IN= 44.05257068647377 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.833839753341088E+00 Y=-1.944308319861094E+00 Z=-4.758509313320815E+00 VX= 6.911226675674507E-04 VY=-1.281641184304400E-02 VZ=-1.706378766629272E-02 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 13.7 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= 87.2916 A1= 7.093444347382E-8 A2= -1.443811535835E-8 A3= 6.534734368324E-10 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 1991-Jan-01 00:00:00.000 200.4533051072 -32.4224852 32.4254952 32.4255050 1991-Jan-02 23:12:00.000 200.4164741872 -32.4225177 32.4255285 32.4255381 1991-Jan-04 22:24:00.000 200.3796432303 -32.4225501 32.4255618 32.4255712 1991-Jan-06 21:36:00.000 200.3428122366 -32.4225824 32.4255949 32.4256042 1991-Jan-08 20:48:00.000 200.3059812063 -32.4226146 32.4256279 32.4256371 1991-Jan-10 20:00:00.000 200.2691501393 -32.4226468 32.4256609 32.4256700 1991-Jan-12 19:12:00.000 200.2323190358 -32.4226790 32.4256938 32.4257029 1991-Jan-14 18:24:00.000 200.1954878957 -32.4227112 32.4257267 32.4257358 1991-Jan-16 17:36:00.000 200.1586567190 -32.4227434 32.4257597 32.4257688 1991-Jan-18 16:48:00.000 200.1218255057 -32.4227757 32.4257926 32.4258017 1991-Jan-20 16:00:00.000 200.0849942557 -32.4228080 32.4258255 32.4258347 1991-Jan-22 15:12:00.000 200.0481629691 -32.4228403 32.4258585 32.4258677 1991-Jan-24 14:24:00.000 200.0113316457 -32.4228726 32.4258915 32.4259007 1991-Jan-26 13:36:00.000 199.9745002856 -32.4229050 32.4259246 32.4259338 1991-Jan-28 12:48:00.000 199.9376688887 -32.4229374 32.4259577 32.4259669 1991-Jan-30 12:00:00.000 199.9008374549 -32.4229698 32.4259908 32.4260001 1991-Feb-01 11:12:00.000 199.8640059843 -32.4230023 32.4260239 32.4260332 1991-Feb-03 10:24:00.000 199.8271744768 -32.4230348 32.4260571 32.4260664 1991-Feb-05 09:36:00.000 199.7903429323 -32.4230673 32.4260903 32.4260996 1991-Feb-07 08:48:00.000 199.7535113509 -32.4230998 32.4261235 32.4261328 1991-Feb-09 08:00:00.000 199.7166797325 -32.4231324 32.4261568 32.4261661 1991-Feb-11 07:12:00.000 199.6798480772 -32.4231649 32.4261900 32.4261993 1991-Feb-13 06:24:00.000 199.6430163849 -32.4231975 32.4262233 32.4262326 1991-Feb-15 05:36:00.000 199.6061846556 -32.4232300 32.4262565 32.4262658 1991-Feb-17 04:48:00.000 199.5693528893 -32.4232626 32.4262898 32.4262990 1991-Feb-19 04:00:00.000 199.5325210860 -32.4232951 32.4263230 32.4263323 1991-Feb-21 03:12:00.000 199.4956892458 -32.4233277 32.4263563 32.4263655 1991-Feb-23 02:24:00.000 199.4588573686 -32.4233602 32.4263895 32.4263987 1991-Feb-25 01:36:00.000 199.4220254544 -32.4233928 32.4264227 32.4264319 1991-Feb-27 00:48:00.000 199.3851935033 -32.4234253 32.4264560 32.4264651 1991-Mar-01 00:00:00.000 199.3483615151 -32.4234579 32.4264892 32.4264984 $$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/hrzn_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov ********************************************************************************** !$$SOF COMMAND = '2I' START_TIME = '1991-01-01' STOP_TIME = '1991-03-01' STEP_SIZE = '30' QUANTITIES = '19,22' CENTER = '@Sun'