******************************************************************************* JPL/HORIZONS SOHO (P/1999 J6) 2024-May-10 01:40:24 Rec #:90002471 (+COV) Soln.date: 2021-Apr-16_12:13:58 # obs: 267 (1999-2010) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2454119.5 ! 2007-Jan-19.0000000 (TDB) RMSW= n.a. EC= .9842342020457168 QR= .04885808386393634 TP= 2453317.8072115099 OM= 81.59824796423456 W= 21.94708144120514 IN= 26.62913575934271 A= 3.098992135102343 MA= 144.8376066645197 ADIST= 6.149126186340749 PER= 5.4555546844561 N= .180664724 ANGMOM= .005356068 DAN= .05068 DDN= 1.11312 L= 101.4077586 B= 9.643652899999999 MOID= .00987452 TP= 2004-Nov-08.3072115099 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= n.a. M2= n.a. k1= n.a. 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= 4.94637336731E-7 A2= -1.888656765223E-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#7, data arc: 1999-05-10 to 2010-04-22 2: ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri May 10 01:40:24 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: SOHO (P/1999 J6) {source: JPL#7} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2026-Jun-18 00:00:00.0000 UT Stop time : A.D. 2026-Jun-19 00:00:00.0000 UT Step-size : 60 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -6378.137 {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 : ITRF93 {East-longitude positive} Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441} 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.240509.p240802 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-09. PREDICTS-> 2024-AUG-01 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 (>38.000=NO), 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= 2454119.5 ! 2007-Jan-19.0000000 (TDB) RMSW= n.a. EC= .9842342020457168 QR= .04885808386393634 TP= 2453317.8072115099 OM= 81.59824796423456 W= 21.94708144120514 IN= 26.62913575934271 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 1.022819346433292E+00 Y=-4.985995076138677E+00 Z=-3.180974695485901E+00 VX= 1.044845081229888E-03 VY=-9.349444478109138E-04 VZ=-1.072791628438462E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= n.a. M2= n.a. k1= n.a. 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= 4.94637336731E-7 A2= -1.888656765223E-9 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot RNG_3sigma RNGRT_3sig ************************************************************************* $$SOE 2026-Jun-18 00:00 0.079215686557 -99.2597911 14715793.2 112.482631 2026-Jun-18 01:00 0.076831797945 -98.8759833 14428576.1 126.929816 2026-Jun-18 02:00 0.074458943129 -98.3376823 14091304.3 143.388869 2026-Jun-18 03:00 0.072101159756 -97.6173949 13696609.9 162.150594 2026-Jun-18 04:00 0.069763202342 -96.6829019 13236040.8 183.538525 2026-Jun-18 05:00 0.067450664205 -95.4965698 12699945.1 207.905653 2026-Jun-18 06:00 0.065170116184 -94.0146543 12077371.9 235.626124 2026-Jun-18 07:00 0.062929261553 -92.1866671 11356012.5 267.079221 2026-Jun-18 08:00 0.060737104397 -89.9549152 10522214.1 302.621921 2026-Jun-18 09:00 0.058604125339 -87.2543898 9561113.65 342.545411 2026-Jun-18 10:00 0.056542453316 -84.0132610 8456959.49 387.010315 2026-Jun-18 11:00 0.054566014794 -80.1543316 7193704.69 435.955891 2026-Jun-18 12:00 0.052690632144 -75.5978971 5755978.58 488.981211 2026-Jun-18 13:00 0.050934031340 -70.2665143 4130564.49 545.203133 2026-Jun-18 14:00 0.049315707439 -64.0921199 2308717.50 603.108323 2026-Jun-18 15:00 0.047856588318 -57.0256781 305304.562 660.435072 2026-Jun-18 16:00 0.046578439054 -49.0489543 1938136.15 714.141704 2026-Jun-18 17:00 0.045502969452 -40.1870904 4329335.16 760.531613 2026-Jun-18 18:00 0.044650652566 -30.5195277 6866208.02 795.593415 2026-Jun-18 19:00 0.044039332933 -20.1859285 9502347.29 815.561741 2026-Jun-18 20:00 0.043682786430 -9.3837432 12180406.6 817.611083 2026-Jun-18 21:00 0.043589460189 1.6444786 14835793.3 800.497310 2026-Jun-18 22:00 0.043761634798 12.6330902 17402836.2 764.922767 2026-Jun-18 23:00 0.044195189254 23.3205293 19821590.0 713.470458 2026-Jun-19 00:00 0.044880021915 33.4755674 22043663.0 650.113342 $$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. STATISTICAL UNCERTAINTIES Output includes formal +/- 3 standard-deviation statistical orbit uncertainty quantities. There is a 99.7% (1-D) or 98.9% (2-D) chance the actual value is within given bounds. These statistical calculations assume observational data errors are random. If there are systematic biases (such as timing, reduction or star-catalog errors), results can be optimistic. Because the epoch covariance is mapped using linearized variational partial derivatives, results can also be optimistic for times far from the solution epoch, particularly for objects having close planetary encounters. '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 'RNG_3sigma RNGRT_3sig' = Range and range rate (radial velocity) formal 3-standard-deviation uncertainties. Units: KM, 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 = '1999 J6' START_TIME = '2026-Jun-18' STOP_TIME = '2026-Jun-19' STEP_SIZE = '1 hour' QUANTITIES = '19,39'