******************************************************************************* JPL/HORIZONS 12P/Pons-Brooks 2025-Dec-12 18:07:51 Rec #:90000223 (+COV) Soln.date: 2022-May-09_10:46:48 # obs: 430 (1812-1954) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2414270.5 ! 1897-Dec-12.0000000 (TDB) RMSW= n.a. EC= .9546793966627336 QR= .7745662359217889 TP= 2409204.3283676389 OM= 255.7625218419923 W= 199.1315081578012 IN= 73.9093741705598 A= 17.09081916137854 MA= 70.670742511341 ADIST= 33.4070720868353 PER= 70.656565071711 N= .013949536 ANGMOM= .021166473 DAN= 15.4416 DDN= .79604 L= 81.25434970000001 B= -18.3546696 MOID= .18651199 TP= 1884-Jan-28.8283676389 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 5. M2= 11. k1= 15. k2= 10. 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= -9.793811291456E-10 A2= -2.709762193263E-10 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#J542/1, data arc: 1812-08-18 to 1954-09-03 2: k1=15.0, k2=10.0; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 18:07:51 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: 12P/Pons-Brooks {source: JPL#J542/1} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2095-Aug-27 00:00:00.0000 UT Stop time : A.D. 2095-Sep-02 00:00:00.0000 UT Step-size : 180 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.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 (>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= 2414270.5 ! 1897-Dec-12.0000000 (TDB) RMSW= n.a. EC= .9546793966627336 QR= .7745662359217889 TP= 2409204.3283676389 OM= 255.7625218419923 W= 199.1315081578012 IN= 73.9093741705598 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-5.030385393040465E+00 Y=-2.359549665228674E+01 Z=-6.232037106320721E+00 VX=-2.251229415231440E-04 VY=-2.521444768552887E-03 VZ= 1.694756805598230E-04 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 5. M2= 11. k1= 15. k2= 10. 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= -9.793811291456E-10 A2= -2.709762193263E-10 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN delta deldot S-O-T /r **************************************************************** $$SOE 2095-Aug-27 00:00 1.52526785294830 -0.6395644 31.0630 /L 2095-Aug-27 03:00 1.52522492594717 -0.5496540 31.1157 /L 2095-Aug-27 06:00 1.52518849794108 -0.4595159 31.1685 /L 2095-Aug-27 09:00 1.52515858525993 -0.3691530 31.2212 /L 2095-Aug-27 12:00 1.52513520402221 -0.2785683 31.2739 /L 2095-Aug-27 15:00 1.52511837013400 -0.1877646 31.3266 /L 2095-Aug-27 18:00 1.52510809928742 -0.0967451 31.3793 /L 2095-Aug-27 21:00 1.52510440695961 -0.0055126 31.4320 /L 2095-Aug-28 00:00 1.52510730841151 0.0859298 31.4846 /L 2095-Aug-28 03:00 1.52511681868643 0.1775791 31.5372 /L 2095-Aug-28 06:00 1.52513295260923 0.2694323 31.5898 /L 2095-Aug-28 09:00 1.52515572478498 0.3614863 31.6424 /L 2095-Aug-28 12:00 1.52518514959774 0.4537381 31.6950 /L 2095-Aug-28 15:00 1.52522124120985 0.5461845 31.7475 /L 2095-Aug-28 18:00 1.52526401356050 0.6388226 31.8000 /L 2095-Aug-28 21:00 1.52531348036505 0.7316491 31.8525 /L 2095-Aug-29 00:00 1.52536965511360 0.8246609 31.9049 /L 2095-Aug-29 03:00 1.52543255107051 0.9178550 31.9573 /L 2095-Aug-29 06:00 1.52550218127306 1.0112281 32.0097 /L 2095-Aug-29 09:00 1.52557855853075 1.1047771 32.0620 /L 2095-Aug-29 12:00 1.52566169542452 1.1984988 32.1143 /L 2095-Aug-29 15:00 1.52575160430550 1.2923901 32.1665 /L 2095-Aug-29 18:00 1.52584829729472 1.3864477 32.2187 /L 2095-Aug-29 21:00 1.52595178628190 1.4806685 32.2709 /L 2095-Aug-30 00:00 1.52606208292483 1.5750492 32.3230 /L 2095-Aug-30 03:00 1.52617919864864 1.6695865 32.3751 /L 2095-Aug-30 06:00 1.52630314464522 1.7642773 32.4271 /L 2095-Aug-30 09:00 1.52643393187239 1.8591184 32.4791 /L 2095-Aug-30 12:00 1.52657157105317 1.9541064 32.5310 /L 2095-Aug-30 15:00 1.52671607267559 2.0492380 32.5828 /L 2095-Aug-30 18:00 1.52686744699146 2.1445101 32.6346 /L 2095-Aug-30 21:00 1.52702570401666 2.2399193 32.6864 /L 2095-Aug-31 00:00 1.52719085352976 2.3354624 32.7381 /L 2095-Aug-31 03:00 1.52736290507219 2.4311361 32.7897 /L 2095-Aug-31 06:00 1.52754186794740 2.5269370 32.8413 /L 2095-Aug-31 09:00 1.52772775122074 2.6228619 32.8928 /L 2095-Aug-31 12:00 1.52792056371866 2.7189074 32.9443 /L 2095-Aug-31 15:00 1.52812031402897 2.8150703 32.9957 /L 2095-Aug-31 18:00 1.52832701049986 2.9113472 33.0470 /L 2095-Aug-31 21:00 1.52854066124002 3.0077348 33.0982 /L 2095-Sep-01 00:00 1.52876127411842 3.1042298 33.1494 /L 2095-Sep-01 03:00 1.52898885676362 3.2008289 33.2005 /L 2095-Sep-01 06:00 1.52922341656412 3.2975287 33.2515 /L 2095-Sep-01 09:00 1.52946496066792 3.3943258 33.3025 /L 2095-Sep-01 12:00 1.52971349598238 3.4912171 33.3534 /L 2095-Sep-01 15:00 1.52996902917429 3.5881990 33.4042 /L 2095-Sep-01 18:00 1.53023156666960 3.6852683 33.4549 /L 2095-Sep-01 21:00 1.53050111465344 3.7824217 33.5056 /L 2095-Sep-02 00:00 1.53077767907036 3.8796559 33.5561 /L $$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. 'delta deldot' = Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer. Units: AU and KM/S 'S-O-T /r' = Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers' location at print-time. The '/r' column provides a code indicating the targets' apparent position relative to the Sun in the observers' sky, as described below: Case A: For an observing location on the surface of a rotating body, that body rotational sense is considered: /T indicates target TRAILS Sun (evening sky: rises and sets AFTER Sun) /L indicates target LEADS Sun (morning sky: rises and sets BEFORE Sun) Case B: For an observing point that does not have a rotational model (such as a spacecraft), the "leading" and "trailing" condition is defined by the observers' heliocentric ORBITAL motion: * If continuing in the observers' current direction of heliocentric motion would encounter the targets' apparent longitude first, followed by the Sun's, the target LEADS the Sun as seen by the observer. * If the Sun's apparent longitude would be encountered first, followed by the targets', the target TRAILS the Sun. Two other codes can be output: /* indicates observer is Sun-centered (undefined) /? Target is aligned with Sun center (no lead or trail) The S-O-T solar elongation angle is numerically the minimum separation angle of the Sun and target in the sky in any direction. It does NOT indicate the amount of separation in the leading or trailing directions, which would be defined along the equator of a spherical coordinate system. Units: DEGREES 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 COMMAND = '90000223' QUANTITIES = '20,23' START_TIME = '2095-Aug-27' STEP_SIZE = '3 hours' STOP_TIME = '2095-Sep-02'