******************************************************************************* JPL/HORIZONS 16P/Brooks 2 2024-May-10 17:13:10 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 Fri May 10 17:13:10 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.240510.p240803 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-10. PREDICTS-> 2024-AUG-02 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 ************************************************** $$SOE 2028-Apr-15 00:00 1.888064191870 -0.4331393 2028-Apr-15 03:00 1.888033236095 -0.4244361 2028-Apr-15 06:00 1.888002908661 -0.4157322 2028-Apr-15 09:00 1.887973209618 -0.4070276 2028-Apr-15 12:00 1.887944139016 -0.3983223 2028-Apr-15 15:00 1.887915696906 -0.3896164 2028-Apr-15 18:00 1.887887883333 -0.3809098 2028-Apr-15 21:00 1.887860698346 -0.3722025 2028-Apr-16 00:00 1.887834141989 -0.3634947 2028-Apr-16 03:00 1.887808214308 -0.3547862 2028-Apr-16 06:00 1.887782915346 -0.3460771 2028-Apr-16 09:00 1.887758245146 -0.3373674 2028-Apr-16 12:00 1.887734203749 -0.3286572 2028-Apr-16 15:00 1.887710791195 -0.3199464 2028-Apr-16 18:00 1.887688007525 -0.3112351 2028-Apr-16 21:00 1.887665852775 -0.3025233 2028-Apr-17 00:00 1.887644326985 -0.2938109 2028-Apr-17 03:00 1.887623430189 -0.2850981 2028-Apr-17 06:00 1.887603162423 -0.2763847 2028-Apr-17 09:00 1.887583523721 -0.2676709 2028-Apr-17 12:00 1.887564514116 -0.2589567 2028-Apr-17 15:00 1.887546133641 -0.2502420 2028-Apr-17 18:00 1.887528382325 -0.2415269 2028-Apr-17 21:00 1.887511260199 -0.2328114 2028-Apr-18 00:00 1.887494767292 -0.2240955 2028-Apr-18 03:00 1.887478903631 -0.2153793 2028-Apr-18 06:00 1.887463669243 -0.2066626 2028-Apr-18 09:00 1.887449064154 -0.1979456 2028-Apr-18 12:00 1.887435088389 -0.1892283 2028-Apr-18 15:00 1.887421741970 -0.1805107 2028-Apr-18 18:00 1.887409024920 -0.1717928 2028-Apr-18 21:00 1.887396937261 -0.1630745 2028-Apr-19 00:00 1.887385479013 -0.1543560 2028-Apr-19 03:00 1.887374650195 -0.1456373 2028-Apr-19 06:00 1.887364450826 -0.1369183 2028-Apr-19 09:00 1.887354880922 -0.1281990 2028-Apr-19 12:00 1.887345940499 -0.1194796 2028-Apr-19 15:00 1.887337629574 -0.1107599 2028-Apr-19 18:00 1.887329948159 -0.1020401 2028-Apr-19 21:00 1.887322896267 -0.0933201 2028-Apr-20 00:00 1.887316473911 -0.0845999 2028-Apr-20 03:00 1.887310681101 -0.0758796 2028-Apr-20 06:00 1.887305517847 -0.0671592 2028-Apr-20 09:00 1.887300984157 -0.0584387 2028-Apr-20 12:00 1.887297080039 -0.0497180 2028-Apr-20 15:00 1.887293805500 -0.0409973 2028-Apr-20 18:00 1.887291160545 -0.0322765 2028-Apr-20 21:00 1.887289145179 -0.0235557 2028-Apr-21 00:00 1.887287759404 -0.0148348 2028-Apr-21 03:00 1.887287003223 -0.0061139 2028-Apr-21 06:00 1.887286876638 0.0026070 2028-Apr-21 09:00 1.887287379648 0.0113280 2028-Apr-21 12:00 1.887288512253 0.0200489 2028-Apr-21 15:00 1.887290274450 0.0287697 2028-Apr-21 18:00 1.887292666237 0.0374905 2028-Apr-21 21:00 1.887295687609 0.0462113 2028-Apr-22 00:00 1.887299338562 0.0549319 2028-Apr-22 03:00 1.887303619089 0.0636525 2028-Apr-22 06:00 1.887308529182 0.0723730 2028-Apr-22 09:00 1.887314068834 0.0810933 2028-Apr-22 12:00 1.887320238035 0.0898135 2028-Apr-22 15:00 1.887327036774 0.0985335 2028-Apr-22 18:00 1.887334465041 0.1072534 2028-Apr-22 21:00 1.887342522822 0.1159731 2028-Apr-23 00:00 1.887351210104 0.1246926 2028-Apr-23 03:00 1.887360526871 0.1334119 2028-Apr-23 06:00 1.887370473110 0.1421310 2028-Apr-23 09:00 1.887381048801 0.1508498 2028-Apr-23 12:00 1.887392253928 0.1595684 2028-Apr-23 15:00 1.887404088472 0.1682867 2028-Apr-23 18:00 1.887416552412 0.1770047 2028-Apr-23 21:00 1.887429645728 0.1857224 2028-Apr-24 00:00 1.887443368397 0.1944398 2028-Apr-24 03:00 1.887457720396 0.2031569 2028-Apr-24 06:00 1.887472701701 0.2118736 2028-Apr-24 09:00 1.887488312287 0.2205900 2028-Apr-24 12:00 1.887504552127 0.2293060 2028-Apr-24 15:00 1.887521421193 0.2380216 2028-Apr-24 18:00 1.887538919457 0.2467368 2028-Apr-24 21:00 1.887557046890 0.2554516 2028-Apr-25 00:00 1.887575803461 0.2641659 2028-Apr-25 03:00 1.887595189138 0.2728798 2028-Apr-25 06:00 1.887615203888 0.2815933 2028-Apr-25 09:00 1.887635847678 0.2903062 2028-Apr-25 12:00 1.887657120473 0.2990187 2028-Apr-25 15:00 1.887679022236 0.3077307 2028-Apr-25 18:00 1.887701552932 0.3164421 2028-Apr-25 21:00 1.887724712521 0.3251531 2028-Apr-26 00:00 1.887748500964 0.3338634 2028-Apr-26 03:00 1.887772918223 0.3425732 2028-Apr-26 06:00 1.887797964254 0.3512825 2028-Apr-26 09:00 1.887823639016 0.3599911 2028-Apr-26 12:00 1.887849942466 0.3686991 2028-Apr-26 15:00 1.887876874559 0.3774065 2028-Apr-26 18:00 1.887904435249 0.3861133 2028-Apr-26 21:00 1.887932624491 0.3948194 2028-Apr-27 00:00 1.887961442236 0.4035249 2028-Apr-27 03:00 1.887990888436 0.4122296 2028-Apr-27 06:00 1.888020963042 0.4209337 2028-Apr-27 09:00 1.888051666002 0.4296371 2028-Apr-27 12:00 1.888082997264 0.4383397 2028-Apr-27 15:00 1.888114956777 0.4470416 2028-Apr-27 18:00 1.888147544485 0.4557427 2028-Apr-27 21:00 1.888180760334 0.4644431 2028-Apr-28 00:00 1.888214604268 0.4731427 2028-Apr-28 03:00 1.888249076230 0.4818415 2028-Apr-28 06:00 1.888284176161 0.4905395 2028-Apr-28 09:00 1.888319904003 0.4992366 2028-Apr-28 12:00 1.888356259695 0.5079329 2028-Apr-28 15:00 1.888393243176 0.5166284 2028-Apr-28 18:00 1.888430854384 0.5253230 2028-Apr-28 21:00 1.888469093255 0.5340167 2028-Apr-29 00:00 1.888507959724 0.5427095 2028-Apr-29 03:00 1.888547453727 0.5514013 2028-Apr-29 06:00 1.888587575196 0.5600923 2028-Apr-29 09:00 1.888628324065 0.5687823 2028-Apr-29 12:00 1.888669700263 0.5774713 2028-Apr-29 15:00 1.888711703723 0.5861594 2028-Apr-29 18:00 1.888754334372 0.5948465 2028-Apr-29 21:00 1.888797592140 0.6035326 2028-Apr-30 00:00 1.888841476953 0.6122177 $$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 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'