******************************************************************************* JPL/HORIZONS 12P/Pons-Brooks 2025-Dec-12 21:17:39 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 21:17:39 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. 2024-Jun-01 00:00:00.0000 UT Stop time : A.D. 2024-Jun-04 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.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 RNG_3sigma RNGRT_3sig *************************************************************************************** $$SOE 2024-Jun-01 00:00 1.54568979876935 -0.3716185 44.3786 /T 7557.7020 0.0043486 2024-Jun-01 01:00 1.54568100855400 -0.3589162 44.4074 /T 7545.1625 0.0043448 2024-Jun-01 02:00 1.54567252431630 -0.3461893 44.4362 /T 7532.6178 0.0043409 2024-Jun-01 03:00 1.54566434664625 -0.3334379 44.4650 /T 7520.0681 0.0043370 2024-Jun-01 04:00 1.54565647613349 -0.3206620 44.4939 /T 7507.5133 0.0043331 2024-Jun-01 05:00 1.54564891336738 -0.3078617 44.5227 /T 7494.9536 0.0043293 2024-Jun-01 06:00 1.54564165893670 -0.2950369 44.5515 /T 7482.3890 0.0043254 2024-Jun-01 07:00 1.54563471342997 -0.2821876 44.5803 /T 7469.8195 0.0043216 2024-Jun-01 08:00 1.54562807743526 -0.2693139 44.6090 /T 7457.2453 0.0043177 2024-Jun-01 09:00 1.54562175154022 -0.2564158 44.6378 /T 7444.6663 0.0043139 2024-Jun-01 10:00 1.54561573633216 -0.2434933 44.6666 /T 7432.0826 0.0043101 2024-Jun-01 11:00 1.54561003239789 -0.2305464 44.6954 /T 7419.4943 0.0043062 2024-Jun-01 12:00 1.54560464032393 -0.2175752 44.7241 /T 7406.9014 0.0043024 2024-Jun-01 13:00 1.54559956069637 -0.2045796 44.7529 /T 7394.3040 0.0042986 2024-Jun-01 14:00 1.54559479410089 -0.1915596 44.7817 /T 7381.7022 0.0042948 2024-Jun-01 15:00 1.54559034112273 -0.1785154 44.8104 /T 7369.0959 0.0042910 2024-Jun-01 16:00 1.54558620234688 -0.1654469 44.8392 /T 7356.4854 0.0042872 2024-Jun-01 17:00 1.54558237835776 -0.1523540 44.8679 /T 7343.8705 0.0042834 2024-Jun-01 18:00 1.54557886973947 -0.1392370 44.8966 /T 7331.2514 0.0042796 2024-Jun-01 19:00 1.54557567707572 -0.1260956 44.9254 /T 7318.6281 0.0042759 2024-Jun-01 20:00 1.54557280094985 -0.1129301 44.9541 /T 7306.0008 0.0042721 2024-Jun-01 21:00 1.54557024194476 -0.0997403 44.9828 /T 7293.3694 0.0042683 2024-Jun-01 22:00 1.54556800064294 -0.0865263 45.0115 /T 7280.7340 0.0042646 2024-Jun-01 23:00 1.54556607762652 -0.0732882 45.0402 /T 7268.0946 0.0042608 2024-Jun-02 00:00 1.54556447347725 -0.0600258 45.0689 /T 7255.4515 0.0042571 2024-Jun-02 01:00 1.54556318877646 -0.0467394 45.0976 /T 7242.8045 0.0042533 2024-Jun-02 02:00 1.54556222410507 -0.0334288 45.1263 /T 7230.1537 0.0042496 2024-Jun-02 03:00 1.54556158004364 -0.0200940 45.1550 /T 7217.4993 0.0042459 2024-Jun-02 04:00 1.54556125717231 -0.0067352 45.1837 /T 7204.8412 0.0042422 2024-Jun-02 05:00 1.54556125607084 0.0066477 45.2124 /T 7192.1796 0.0042384 2024-Jun-02 06:00 1.54556157731859 0.0200547 45.2410 /T 7179.5145 0.0042347 2024-Jun-02 07:00 1.54556222149454 0.0334857 45.2697 /T 7166.8459 0.0042310 2024-Jun-02 08:00 1.54556318917731 0.0469408 45.2984 /T 7154.1740 0.0042273 2024-Jun-02 09:00 1.54556448094497 0.0604198 45.3270 /T 7141.4988 0.0042236 2024-Jun-02 10:00 1.54556609737540 0.0739229 45.3557 /T 7128.8203 0.0042199 2024-Jun-02 11:00 1.54556803904596 0.0874500 45.3843 /T 7116.1386 0.0042163 2024-Jun-02 12:00 1.54557030653369 0.1010010 45.4129 /T 7103.4539 0.0042126 2024-Jun-02 13:00 1.54557290041516 0.1145760 45.4416 /T 7090.7660 0.0042089 2024-Jun-02 14:00 1.54557582126661 0.1281750 45.4702 /T 7078.0752 0.0042053 2024-Jun-02 15:00 1.54557906966384 0.1417978 45.4988 /T 7065.3814 0.0042016 2024-Jun-02 16:00 1.54558264618231 0.1554446 45.5274 /T 7052.6848 0.0041979 2024-Jun-02 17:00 1.54558655139706 0.1691152 45.5560 /T 7039.9854 0.0041943 2024-Jun-02 18:00 1.54559078588271 0.1828097 45.5846 /T 7027.2833 0.0041907 2024-Jun-02 19:00 1.54559535021355 0.1965281 45.6132 /T 7014.5785 0.0041870 2024-Jun-02 20:00 1.54560024496342 0.2102703 45.6418 /T 7001.8711 0.0041834 2024-Jun-02 21:00 1.54560547070577 0.2240364 45.6703 /T 6989.1612 0.0041798 2024-Jun-02 22:00 1.54561102801367 0.2378262 45.6989 /T 6976.4489 0.0041762 2024-Jun-02 23:00 1.54561691745984 0.2516398 45.7275 /T 6963.7341 0.0041725 2024-Jun-03 00:00 1.54562313961656 0.2654772 45.7560 /T 6951.0170 0.0041689 2024-Jun-03 01:00 1.54562969505568 0.2793384 45.7846 /T 6938.2977 0.0041653 2024-Jun-03 02:00 1.54563658434874 0.2932233 45.8131 /T 6925.5762 0.0041617 2024-Jun-03 03:00 1.54564380806683 0.3071319 45.8416 /T 6912.8526 0.0041582 2024-Jun-03 04:00 1.54565136678067 0.3210643 45.8702 /T 6900.1270 0.0041546 2024-Jun-03 05:00 1.54565926106058 0.3350203 45.8987 /T 6887.3994 0.0041510 2024-Jun-03 06:00 1.54566749147646 0.3490000 45.9272 /T 6874.6698 0.0041474 2024-Jun-03 07:00 1.54567605859786 0.3630034 45.9557 /T 6861.9385 0.0041439 2024-Jun-03 08:00 1.54568496299390 0.3770304 45.9842 /T 6849.2054 0.0041403 2024-Jun-03 09:00 1.54569420523333 0.3910810 46.0127 /T 6836.4706 0.0041367 2024-Jun-03 10:00 1.54570378588447 0.4051553 46.0412 /T 6823.7342 0.0041332 2024-Jun-03 11:00 1.54571370551527 0.4192531 46.0697 /T 6810.9963 0.0041297 2024-Jun-03 12:00 1.54572396469327 0.4333745 46.0981 /T 6798.2569 0.0041261 2024-Jun-03 13:00 1.54573456398567 0.4475195 46.1266 /T 6785.5161 0.0041226 2024-Jun-03 14:00 1.54574550395918 0.4616880 46.1551 /T 6772.7740 0.0041191 2024-Jun-03 15:00 1.54575678518012 0.4758801 46.1835 /T 6760.0306 0.0041155 2024-Jun-03 16:00 1.54576840821453 0.4900956 46.2120 /T 6747.2861 0.0041120 2024-Jun-03 17:00 1.54578037362790 0.5043347 46.2404 /T 6734.5405 0.0041085 2024-Jun-03 18:00 1.54579268198542 0.5185972 46.2688 /T 6721.7939 0.0041050 2024-Jun-03 19:00 1.54580533385182 0.5328832 46.2973 /T 6709.0464 0.0041015 2024-Jun-03 20:00 1.54581832979148 0.5471926 46.3257 /T 6696.2980 0.0040980 2024-Jun-03 21:00 1.54583167036836 0.5615255 46.3541 /T 6683.5488 0.0040945 2024-Jun-03 22:00 1.54584535614597 0.5758818 46.3825 /T 6670.7989 0.0040910 2024-Jun-03 23:00 1.54585938768753 0.5902614 46.4109 /T 6658.0484 0.0040876 2024-Jun-04 00:00 1.54587376555571 0.6046645 46.4393 /T 6645.2974 0.0040841 $$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. '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 '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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov *************************************************************************************** !$$SOF COMMAND = '90000223' QUANTITIES = '20,23,39' START_TIME = '2024-Jun-01' STEP_SIZE = '1 hours' STOP_TIME = '2024-Jun-04'