******************************************************************************* JPL/HORIZONS 16P/Brooks 2 2024-May-04 23:03:46 Rec #:90000273 (+COV) Soln.date: 2024-Feb-21_10:04:25 # obs: 256 (2014-2022) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457551.5 ! 2016-Jun-12.0000000 (TDB) RMSW= n.a. EC= .5689747343717468 QR= 1.454508119049787 TP= 2456823.2687061126 OM= 159.3430168103752 W= 220.1660462077172 IN= 4.30690001028072 A= 3.374530996297229 MA= 115.7852610431851 ADIST= 5.294553873544672 PER= 6.1990956116619 N= .158995174 ANGMOM= .025986482 DAN= 4.03765 DDN= 1.59053 L= 19.4292193 B= -2.7764429 MOID= .45996001 TP= 2014-Jun-14.7687061126 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= 9.248783588409E-9 A2= -3.719175159931E-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#K212/8, data arc: 2014-05-05 to 2022-01-29 2: k1=13.5, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat May 4 23:03:46 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 16P/Brooks 2 {source: JPL#K212/8} 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.240503.p240727 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-03. PREDICTS-> 2024-JUL-26 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= 2457551.5 ! 2016-Jun-12.0000000 (TDB) RMSW= n.a. EC= .5689747343717468 QR= 1.454508119049787 TP= 2456823.2687061126 OM= 159.3430168103752 W= 220.1660462077172 IN= 4.30690001028072 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-4.785156657112749E+00 Y= 2.223233811607666E-01 Z= 2.127861045142695E-01 VX=-2.834284549944352E-03 VY=-4.988562127700583E-03 VZ=-1.677926330814655E-03 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= 9.248783588409E-9 A2= -3.719175159931E-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 1.888064191870 -0.4331393 26.4124156 56.0837159 2028-Apr-15 03:00 1.888033236095 -0.4244361 26.4127065 56.0825550 2028-Apr-15 06:00 1.888002908661 -0.4157322 26.4129915 56.0813600 2028-Apr-15 09:00 1.887973209618 -0.4070276 26.4132705 56.0801309 2028-Apr-15 12:00 1.887944139016 -0.3983223 26.4135436 56.0788674 2028-Apr-15 15:00 1.887915696906 -0.3896164 26.4138108 56.0775693 2028-Apr-15 18:00 1.887887883333 -0.3809098 26.4140721 56.0762365 2028-Apr-15 21:00 1.887860698346 -0.3722025 26.4143275 56.0748687 2028-Apr-16 00:00 1.887834141989 -0.3634947 26.4145769 56.0734658 2028-Apr-16 03:00 1.887808214308 -0.3547862 26.4148205 56.0720276 2028-Apr-16 06:00 1.887782915346 -0.3460771 26.4150581 56.0705539 2028-Apr-16 09:00 1.887758245146 -0.3373674 26.4152898 56.0690447 2028-Apr-16 12:00 1.887734203749 -0.3286572 26.4155155 56.0674996 2028-Apr-16 15:00 1.887710791195 -0.3199464 26.4157354 56.0659186 2028-Apr-16 18:00 1.887688007525 -0.3112351 26.4159493 56.0643016 2028-Apr-16 21:00 1.887665852775 -0.3025233 26.4161573 56.0626482 2028-Apr-17 00:00 1.887644326985 -0.2938109 26.4163593 56.0609585 2028-Apr-17 03:00 1.887623430189 -0.2850981 26.4165555 56.0592323 2028-Apr-17 06:00 1.887603162423 -0.2763847 26.4167457 56.0574694 2028-Apr-17 09:00 1.887583523721 -0.2676709 26.4169299 56.0556696 2028-Apr-17 12:00 1.887564514116 -0.2589567 26.4171083 56.0538330 2028-Apr-17 15:00 1.887546133641 -0.2502420 26.4172807 56.0519592 2028-Apr-17 18:00 1.887528382325 -0.2415269 26.4174472 56.0500482 2028-Apr-17 21:00 1.887511260199 -0.2328114 26.4176078 56.0480998 2028-Apr-18 00:00 1.887494767292 -0.2240955 26.4177624 56.0461140 2028-Apr-18 03:00 1.887478903631 -0.2153793 26.4179111 56.0440906 2028-Apr-18 06:00 1.887463669243 -0.2066626 26.4180539 56.0420294 2028-Apr-18 09:00 1.887449064154 -0.1979456 26.4181908 56.0399303 2028-Apr-18 12:00 1.887435088389 -0.1892283 26.4183217 56.0377933 2028-Apr-18 15:00 1.887421741970 -0.1805107 26.4184467 56.0356182 2028-Apr-18 18:00 1.887409024920 -0.1717928 26.4185657 56.0334048 2028-Apr-18 21:00 1.887396937261 -0.1630745 26.4186788 56.0311531 2028-Apr-19 00:00 1.887385479013 -0.1543560 26.4187860 56.0288629 2028-Apr-19 03:00 1.887374650195 -0.1456373 26.4188873 56.0265341 2028-Apr-19 06:00 1.887364450826 -0.1369183 26.4189826 56.0241666 2028-Apr-19 09:00 1.887354880922 -0.1281990 26.4190720 56.0217603 2028-Apr-19 12:00 1.887345940499 -0.1194796 26.4191554 56.0193150 2028-Apr-19 15:00 1.887337629574 -0.1107599 26.4192330 56.0168307 2028-Apr-19 18:00 1.887329948159 -0.1020401 26.4193045 56.0143072 2028-Apr-19 21:00 1.887322896267 -0.0933201 26.4193702 56.0117445 2028-Apr-20 00:00 1.887316473911 -0.0845999 26.4194299 56.0091423 2028-Apr-20 03:00 1.887310681101 -0.0758796 26.4194837 56.0065006 2028-Apr-20 06:00 1.887305517847 -0.0671592 26.4195315 56.0038193 2028-Apr-20 09:00 1.887300984157 -0.0584387 26.4195734 56.0010982 2028-Apr-20 12:00 1.887297080039 -0.0497180 26.4196094 55.9983373 2028-Apr-20 15:00 1.887293805500 -0.0409973 26.4196395 55.9955364 2028-Apr-20 18:00 1.887291160545 -0.0322765 26.4196636 55.9926955 2028-Apr-20 21:00 1.887289145179 -0.0235557 26.4196817 55.9898143 2028-Apr-21 00:00 1.887287759404 -0.0148348 26.4196939 55.9868929 2028-Apr-21 03:00 1.887287003223 -0.0061139 26.4197002 55.9839310 2028-Apr-21 06:00 1.887286876638 0.0026070 26.4197006 55.9809286 2028-Apr-21 09:00 1.887287379648 0.0113280 26.4196950 55.9778856 2028-Apr-21 12:00 1.887288512253 0.0200489 26.4196835 55.9748019 2028-Apr-21 15:00 1.887290274450 0.0287697 26.4196661 55.9716773 2028-Apr-21 18:00 1.887292666237 0.0374905 26.4196427 55.9685117 2028-Apr-21 21:00 1.887295687609 0.0462113 26.4196134 55.9653052 2028-Apr-22 00:00 1.887299338562 0.0549319 26.4195781 55.9620574 2028-Apr-22 03:00 1.887303619089 0.0636525 26.4195369 55.9587684 2028-Apr-22 06:00 1.887308529182 0.0723730 26.4194898 55.9554380 2028-Apr-22 09:00 1.887314068834 0.0810933 26.4194367 55.9520662 2028-Apr-22 12:00 1.887320238035 0.0898135 26.4193777 55.9486529 2028-Apr-22 15:00 1.887327036774 0.0985335 26.4193128 55.9451978 2028-Apr-22 18:00 1.887334465041 0.1072534 26.4192420 55.9417011 2028-Apr-22 21:00 1.887342522822 0.1159731 26.4191652 55.9381625 2028-Apr-23 00:00 1.887351210104 0.1246926 26.4190824 55.9345819 2028-Apr-23 03:00 1.887360526871 0.1334119 26.4189938 55.9309594 2028-Apr-23 06:00 1.887370473110 0.1421310 26.4188992 55.9272947 2028-Apr-23 09:00 1.887381048801 0.1508498 26.4187986 55.9235879 2028-Apr-23 12:00 1.887392253928 0.1595684 26.4186922 55.9198388 2028-Apr-23 15:00 1.887404088472 0.1682867 26.4185798 55.9160474 2028-Apr-23 18:00 1.887416552412 0.1770047 26.4184614 55.9122136 2028-Apr-23 21:00 1.887429645728 0.1857224 26.4183372 55.9083373 2028-Apr-24 00:00 1.887443368397 0.1944398 26.4182070 55.9044185 2028-Apr-24 03:00 1.887457720396 0.2031569 26.4180709 55.9004571 2028-Apr-24 06:00 1.887472701701 0.2118736 26.4179288 55.8964530 2028-Apr-24 09:00 1.887488312287 0.2205900 26.4177808 55.8924062 2028-Apr-24 12:00 1.887504552127 0.2293060 26.4176269 55.8883167 2028-Apr-24 15:00 1.887521421193 0.2380216 26.4174671 55.8841844 2028-Apr-24 18:00 1.887538919457 0.2467368 26.4173013 55.8800092 2028-Apr-24 21:00 1.887557046890 0.2554516 26.4171296 55.8757912 2028-Apr-25 00:00 1.887575803461 0.2641659 26.4169520 55.8715302 2028-Apr-25 03:00 1.887595189138 0.2728798 26.4167685 55.8672264 2028-Apr-25 06:00 1.887615203888 0.2815933 26.4165790 55.8628796 2028-Apr-25 09:00 1.887635847678 0.2903062 26.4163836 55.8584899 2028-Apr-25 12:00 1.887657120473 0.2990187 26.4161823 55.8540572 2028-Apr-25 15:00 1.887679022236 0.3077307 26.4159750 55.8495816 2028-Apr-25 18:00 1.887701552932 0.3164421 26.4157619 55.8450630 2028-Apr-25 21:00 1.887724712521 0.3251531 26.4155428 55.8405015 2028-Apr-26 00:00 1.887748500964 0.3338634 26.4153177 55.8358970 2028-Apr-26 03:00 1.887772918223 0.3425732 26.4150868 55.8312497 2028-Apr-26 06:00 1.887797964254 0.3512825 26.4148499 55.8265596 2028-Apr-26 09:00 1.887823639016 0.3599911 26.4146072 55.8218266 2028-Apr-26 12:00 1.887849942466 0.3686991 26.4143585 55.8170509 2028-Apr-26 15:00 1.887876874559 0.3774065 26.4141038 55.8122324 2028-Apr-26 18:00 1.887904435249 0.3861133 26.4138433 55.8073713 2028-Apr-26 21:00 1.887932624491 0.3948194 26.4135768 55.8024677 2028-Apr-27 00:00 1.887961442236 0.4035249 26.4133045 55.7975215 2028-Apr-27 03:00 1.887990888436 0.4122296 26.4130262 55.7925329 2028-Apr-27 06:00 1.888020963042 0.4209337 26.4127420 55.7875020 2028-Apr-27 09:00 1.888051666002 0.4296371 26.4124519 55.7824289 2028-Apr-27 12:00 1.888082997264 0.4383397 26.4121559 55.7773136 2028-Apr-27 15:00 1.888114956777 0.4470416 26.4118539 55.7721563 2028-Apr-27 18:00 1.888147544485 0.4557427 26.4115461 55.7669572 2028-Apr-27 21:00 1.888180760334 0.4644431 26.4112323 55.7617162 2028-Apr-28 00:00 1.888214604268 0.4731427 26.4109126 55.7564337 2028-Apr-28 03:00 1.888249076230 0.4818415 26.4105871 55.7511097 2028-Apr-28 06:00 1.888284176161 0.4905395 26.4102556 55.7457444 2028-Apr-28 09:00 1.888319904003 0.4992366 26.4099182 55.7403379 2028-Apr-28 12:00 1.888356259695 0.5079329 26.4095749 55.7348904 2028-Apr-28 15:00 1.888393243176 0.5166284 26.4092257 55.7294021 2028-Apr-28 18:00 1.888430854384 0.5253230 26.4088706 55.7238731 2028-Apr-28 21:00 1.888469093255 0.5340167 26.4085096 55.7183037 2028-Apr-29 00:00 1.888507959724 0.5427095 26.4081427 55.7126940 2028-Apr-29 03:00 1.888547453727 0.5514013 26.4077699 55.7070443 2028-Apr-29 06:00 1.888587575196 0.5600923 26.4073912 55.7013548 2028-Apr-29 09:00 1.888628324065 0.5687823 26.4070066 55.6956257 2028-Apr-29 12:00 1.888669700263 0.5774713 26.4066161 55.6898571 2028-Apr-29 15:00 1.888711703723 0.5861594 26.4062197 55.6840494 2028-Apr-29 18:00 1.888754334372 0.5948465 26.4058174 55.6782028 2028-Apr-29 21:00 1.888797592140 0.6035326 26.4054092 55.6723175 2028-Apr-30 00:00 1.888841476953 0.6122177 26.4049952 55.6663938 $$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 = '90000273' START_TIME = '2028-Apr-15' STOP_TIME = '2028-Apr-30' STEP_SIZE = '3 hours' QUANTITIES = '19,22'