******************************************************************************* JPL/HORIZONS 16P/Brooks 2 2025-Dec-12 17:45:29 Rec #:90000273 (+COV) Soln.date: 2015-May-12_21:59:19 # obs: 403 (1932-2015) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457164.5 ! 2015-May-22.0000000 (TDB) RMSW= n.a. EC= .5632234095202744 QR= 1.466792470259358 TP= 2456816.2433622442 OM= 159.2804324225749 W= 219.7488417157946 IN= 4.261187225367249 A= 3.358221347550548 MA= 55.77498981761082 ADIST= 5.249650224841737 PER= 6.1542081254094 N= .160154851 ANGMOM= .026048115 DAN= 4.04422 DDN= 1.60005 L= 18.9513213 B= -2.7232172 MOID= .47080499 TP= 2014-Jun-07.7433622442 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 12.2 M2= 15.6 k1= 13.5 k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 3.668540120125E-9 A2= -1.497779637575E-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#K074/9, data arc: 1932-10-21 to 2015-03-25 2: k1=13.5, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 17:45:29 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: 16P/Brooks 2 {source: JPL#K074/9} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2028-Apr-15 00:00:00.0000 UT Stop time : A.D. 2028-Apr-30 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= 2457164.5 ! 2015-May-22.0000000 (TDB) RMSW= n.a. EC= .5632234095202744 QR= 1.466792470259358 TP= 2456816.2433622442 OM= 159.2804324225749 W= 219.7488417157946 IN= 4.261187225367249 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-2.583921848413116E+00 Y= 1.901259974058908E+00 Z= 7.435721433730190E-01 VX=-9.127256717667965E-03 VY=-2.786235599837735E-03 VZ=-7.295230720003882E-04 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 12.2 M2= 15.6 k1= 13.5 k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 3.668540120125E-9 A2= -1.497779637575E-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 VmagSn VmagOb *************************************************************************** $$SOE 2028-Apr-15 00:00 1.888275225711 -0.4619027 26.4108476 56.0810382 2028-Apr-15 03:00 1.888242193273 -0.4532028 26.4111580 56.0798528 2028-Apr-15 06:00 1.888209788942 -0.4445021 26.4114626 56.0786334 2028-Apr-15 09:00 1.888178012771 -0.4358007 26.4117612 56.0773798 2028-Apr-15 12:00 1.888146864816 -0.4270985 26.4120539 56.0760918 2028-Apr-15 15:00 1.888116345128 -0.4183957 26.4123408 56.0747692 2028-Apr-15 18:00 1.888086453758 -0.4096921 26.4126217 56.0734118 2028-Apr-15 21:00 1.888057190756 -0.4009878 26.4128966 56.0720195 2028-Apr-16 00:00 1.888028556173 -0.3922829 26.4131657 56.0705921 2028-Apr-16 03:00 1.888000550056 -0.3835772 26.4134289 56.0691294 2028-Apr-16 06:00 1.887973172451 -0.3748710 26.4136861 56.0676312 2028-Apr-16 09:00 1.887946423406 -0.3661641 26.4139374 56.0660974 2028-Apr-16 12:00 1.887920302966 -0.3574566 26.4141828 56.0645278 2028-Apr-16 15:00 1.887894811173 -0.3487485 26.4144223 56.0629223 2028-Apr-16 18:00 1.887869948072 -0.3400398 26.4146558 56.0612807 2028-Apr-16 21:00 1.887845713703 -0.3313306 26.4148835 56.0596028 2028-Apr-17 00:00 1.887822108108 -0.3226208 26.4151052 56.0578886 2028-Apr-17 03:00 1.887799131326 -0.3139104 26.4153210 56.0561378 2028-Apr-17 06:00 1.887776783397 -0.3051995 26.4155308 56.0543503 2028-Apr-17 09:00 1.887755064357 -0.2964881 26.4157348 56.0525260 2028-Apr-17 12:00 1.887733974243 -0.2877762 26.4159328 56.0506648 2028-Apr-17 15:00 1.887713513091 -0.2790638 26.4161249 56.0487665 2028-Apr-17 18:00 1.887693680935 -0.2703510 26.4163110 56.0468309 2028-Apr-17 21:00 1.887674477809 -0.2616377 26.4164913 56.0448580 2028-Apr-18 00:00 1.887655903744 -0.2529239 26.4166656 56.0428476 2028-Apr-18 03:00 1.887637958772 -0.2442098 26.4168340 56.0407996 2028-Apr-18 06:00 1.887620642924 -0.2354952 26.4169964 56.0387139 2028-Apr-18 09:00 1.887603956228 -0.2267802 26.4171529 56.0365903 2028-Apr-18 12:00 1.887587898713 -0.2180649 26.4173035 56.0344287 2028-Apr-18 15:00 1.887572470405 -0.2093491 26.4174482 56.0322289 2028-Apr-18 18:00 1.887557671331 -0.2006331 26.4175869 56.0299910 2028-Apr-18 21:00 1.887543501515 -0.1919166 26.4177197 56.0277147 2028-Apr-19 00:00 1.887529960981 -0.1831999 26.4178466 56.0253999 2028-Apr-19 03:00 1.887517049752 -0.1744828 26.4179676 56.0230466 2028-Apr-19 06:00 1.887504767850 -0.1657655 26.4180826 56.0206545 2028-Apr-19 09:00 1.887493115295 -0.1570479 26.4181917 56.0182236 2028-Apr-19 12:00 1.887482092108 -0.1483300 26.4182948 56.0157538 2028-Apr-19 15:00 1.887471698306 -0.1396119 26.4183920 56.0132449 2028-Apr-19 18:00 1.887461933907 -0.1308935 26.4184833 56.0106968 2028-Apr-19 21:00 1.887452798927 -0.1221749 26.4185687 56.0081095 2028-Apr-20 00:00 1.887444293382 -0.1134561 26.4186481 56.0054827 2028-Apr-20 03:00 1.887436417287 -0.1047371 26.4187216 56.0028164 2028-Apr-20 06:00 1.887429170653 -0.0960180 26.4187891 56.0001105 2028-Apr-20 09:00 1.887422553495 -0.0872987 26.4188507 55.9973649 2028-Apr-20 12:00 1.887416565822 -0.0785792 26.4189064 55.9945794 2028-Apr-20 15:00 1.887411207644 -0.0698596 26.4189562 55.9917539 2028-Apr-20 18:00 1.887406478971 -0.0611399 26.4190000 55.9888884 2028-Apr-20 21:00 1.887402379811 -0.0524201 26.4190379 55.9859826 2028-Apr-21 00:00 1.887398910171 -0.0437002 26.4190698 55.9830366 2028-Apr-21 03:00 1.887396070055 -0.0349802 26.4190958 55.9800501 2028-Apr-21 06:00 1.887393859470 -0.0262602 26.4191159 55.9770232 2028-Apr-21 09:00 1.887392278419 -0.0175401 26.4191301 55.9739556 2028-Apr-21 12:00 1.887391326903 -0.0088200 26.4191383 55.9708472 2028-Apr-21 15:00 1.887391004926 -0.0000998 26.4191405 55.9676981 2028-Apr-21 18:00 1.887391312487 0.0086203 26.4191369 55.9645079 2028-Apr-21 21:00 1.887392249586 0.0173404 26.4191273 55.9612768 2028-Apr-22 00:00 1.887393816222 0.0260605 26.4191118 55.9580044 2028-Apr-22 03:00 1.887396012390 0.0347805 26.4190903 55.9546909 2028-Apr-22 06:00 1.887398838089 0.0435005 26.4190629 55.9513359 2028-Apr-22 09:00 1.887402293312 0.0522204 26.4190296 55.9479395 2028-Apr-22 12:00 1.887406378055 0.0609402 26.4189903 55.9445016 2028-Apr-22 15:00 1.887411092310 0.0696599 26.4189451 55.9410220 2028-Apr-22 18:00 1.887416436069 0.0783795 26.4188940 55.9375006 2028-Apr-22 21:00 1.887422409323 0.0870989 26.4188369 55.9339375 2028-Apr-23 00:00 1.887429012062 0.0958182 26.4187739 55.9303324 2028-Apr-23 03:00 1.887436244274 0.1045374 26.4187050 55.9266853 2028-Apr-23 06:00 1.887444105949 0.1132563 26.4186301 55.9229960 2028-Apr-23 09:00 1.887452597071 0.1219751 26.4185493 55.9192647 2028-Apr-23 12:00 1.887461717628 0.1306937 26.4184626 55.9154910 2028-Apr-23 15:00 1.887471467602 0.1394120 26.4183699 55.9116751 2028-Apr-23 18:00 1.887481846979 0.1481301 26.4182713 55.9078167 2028-Apr-23 21:00 1.887492855740 0.1568480 26.4181668 55.9039159 2028-Apr-24 00:00 1.887504493867 0.1655656 26.4180563 55.8999725 2028-Apr-24 03:00 1.887516761340 0.1742829 26.4179399 55.8959866 2028-Apr-24 06:00 1.887529658138 0.1829999 26.4178176 55.8919579 2028-Apr-24 09:00 1.887543184240 0.1917166 26.4176894 55.8878866 2028-Apr-24 12:00 1.887557339622 0.2004330 26.4175552 55.8837726 2028-Apr-24 15:00 1.887572124261 0.2091491 26.4174151 55.8796157 2028-Apr-24 18:00 1.887587538132 0.2178648 26.4172690 55.8754160 2028-Apr-24 21:00 1.887603581208 0.2265801 26.4171171 55.8711735 2028-Apr-25 00:00 1.887620253463 0.2352950 26.4169592 55.8668881 2028-Apr-25 03:00 1.887637554869 0.2440096 26.4167953 55.8625597 2028-Apr-25 06:00 1.887655485395 0.2527237 26.4166256 55.8581884 2028-Apr-25 09:00 1.887674045013 0.2614374 26.4164499 55.8537742 2028-Apr-25 12:00 1.887693233690 0.2701507 26.4162683 55.8493170 2028-Apr-25 15:00 1.887713051394 0.2788635 26.4160808 55.8448169 2028-Apr-25 18:00 1.887733498092 0.2875758 26.4158873 55.8402739 2028-Apr-25 21:00 1.887754573748 0.2962877 26.4156880 55.8356879 2028-Apr-26 00:00 1.887776278329 0.3049990 26.4154827 55.8310590 2028-Apr-26 03:00 1.887798611796 0.3137098 26.4152714 55.8263873 2028-Apr-26 06:00 1.887821574112 0.3224201 26.4150543 55.8216727 2028-Apr-26 09:00 1.887845165239 0.3311299 26.4148312 55.8169153 2028-Apr-26 12:00 1.887869385136 0.3398391 26.4146022 55.8121151 2028-Apr-26 15:00 1.887894233762 0.3485477 26.4143673 55.8072723 2028-Apr-26 18:00 1.887919711077 0.3572558 26.4141265 55.8023868 2028-Apr-26 21:00 1.887945817036 0.3659632 26.4138798 55.7974587 2028-Apr-27 00:00 1.887972551596 0.3746700 26.4136271 55.7924882 2028-Apr-27 03:00 1.887999914711 0.3833762 26.4133685 55.7874752 2028-Apr-27 06:00 1.888027906336 0.3920817 26.4131040 55.7824199 2028-Apr-27 09:00 1.888056526422 0.4007866 26.4128336 55.7773224 2028-Apr-27 12:00 1.888085774923 0.4094908 26.4125573 55.7721828 2028-Apr-27 15:00 1.888115651788 0.4181943 26.4122751 55.7670012 2028-Apr-27 18:00 1.888146156967 0.4268971 26.4119869 55.7617777 2028-Apr-27 21:00 1.888177290408 0.4355992 26.4116928 55.7565125 2028-Apr-28 00:00 1.888209052060 0.4443005 26.4113929 55.7512056 2028-Apr-28 03:00 1.888241441868 0.4530011 26.4110870 55.7458573 2028-Apr-28 06:00 1.888274459778 0.4617010 26.4107752 55.7404677 2028-Apr-28 09:00 1.888308105734 0.4704000 26.4104575 55.7350369 2028-Apr-28 12:00 1.888342379680 0.4790983 26.4101339 55.7295652 2028-Apr-28 15:00 1.888377281557 0.4877957 26.4098044 55.7240526 2028-Apr-28 18:00 1.888412811307 0.4964924 26.4094689 55.7184994 2028-Apr-28 21:00 1.888448968871 0.5051882 26.4091276 55.7129058 2028-Apr-29 00:00 1.888485754186 0.5138831 26.4087804 55.7072719 2028-Apr-29 03:00 1.888523167191 0.5225772 26.4084273 55.7015980 2028-Apr-29 06:00 1.888561207823 0.5312704 26.4080682 55.6958843 2028-Apr-29 09:00 1.888599876018 0.5399627 26.4077033 55.6901310 2028-Apr-29 12:00 1.888639171710 0.5486540 26.4073325 55.6843383 2028-Apr-29 15:00 1.888679094834 0.5573445 26.4069557 55.6785065 2028-Apr-29 18:00 1.888719645322 0.5660340 26.4065731 55.6726357 2028-Apr-29 21:00 1.888760823106 0.5747226 26.4061846 55.6667263 2028-Apr-30 00:00 1.888802628117 0.5834102 26.4057902 55.6607785 $$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 COMMAND = '90000273' QUANTITIES = '19,22' START_TIME = '2028-Apr-15' STEP_SIZE = '3 hours' STOP_TIME = '2028-Apr-30'