******************************************************************************* JPL/HORIZONS 2P/Encke 2024-May-22 21:52:23 Rec #:90000090 (+COV) Soln.date: 2024-May-14_12:50:56 # obs: 3228 (2009-2023) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457763.5 ! 2017-Jan-10.0000000 (TDB) RMSW= n.a. EC= .8483341226125654 QR= .3359004239384861 TP= 2457822.5925215459 OM= 334.5599906516921 W= 186.5628226942317 IN= 11.77821845563401 A= 2.214739595515076 MA= 342.3293473152029 ADIST= 4.093578767091667 PER= 3.2960379803288 N= .299033655 ANGMOM= .013554296 DAN= 3.94884 DDN= .33691 L= 160.9858015 B= -1.3368229 MOID= .172819 TP= 2017-Mar-10.0925215459 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 2.4 M1= 15.5 M2= n.a. k1= 4.5 k2= n.a. PHCOF= n.a. COMET comments 1: soln ref.= JPL#K235/39, data arc: 2009-08-15 to 2023-10-13 2: k1=4.5; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed May 22 21:52:23 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 2P/Encke {source: JPL#K235/39} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2023-Oct-15 00:00:00.0000 UT Stop time : A.D. 2023-Oct-31 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 2.4 km 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.240522.p240815 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-22. PREDICTS-> 2024-AUG-14 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= 2457763.5 ! 2017-Jan-10.0000000 (TDB) RMSW= n.a. EC= .8483341226125654 QR= .3359004239384861 TP= 2457822.5925215459 OM= 334.5599906516921 W= 186.5628226942317 IN= 11.77821845563401 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 1.034320611791206E+00 Y= 5.453593139674745E-01 Z= 4.792306727526796E-01 VX=-1.822131087806253E-02 VY= 1.201743696214588E-03 VZ=-1.123280202511210E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 2.4 M1= 15.5 M2= n.a. k1= 4.5 k2= n.a. PHCOF= n.a. ******************************************************************************* Date__(UT)__HR:MN r rdot VmagSn VmagOb *************************************************************************** $$SOE 2023-Oct-15 00:00 0.394805400348 -22.9001958 63.9855166 80.7022504 2023-Oct-15 03:00 0.393161118963 -22.6559641 64.1322163 80.9242466 2023-Oct-15 06:00 0.391534641278 -22.4069317 64.2782063 81.1465044 2023-Oct-15 09:00 0.389926315296 -22.1530576 64.4234352 81.3689676 2023-Oct-15 12:00 0.388336491900 -21.8943031 64.5678507 81.5915781 2023-Oct-15 15:00 0.386765524698 -21.6306314 64.7113991 81.8142762 2023-Oct-15 18:00 0.385213769855 -21.3620085 64.8540257 82.0370001 2023-Oct-15 21:00 0.383681585916 -21.0884025 64.9956746 82.2596864 2023-Oct-16 00:00 0.382169333616 -20.8097845 65.1362889 82.4822699 2023-Oct-16 03:00 0.380677375681 -20.5261284 65.2758107 82.7046835 2023-Oct-16 06:00 0.379206076619 -20.2374109 65.4141809 82.9268584 2023-Oct-16 09:00 0.377755802497 -19.9436122 65.5513394 83.1487239 2023-Oct-16 12:00 0.376326920706 -19.6447154 65.6872254 83.3702079 2023-Oct-16 15:00 0.374919799720 -19.3407074 65.8217769 83.5912362 2023-Oct-16 18:00 0.373534808836 -19.0315786 65.9549312 83.8117331 2023-Oct-16 21:00 0.372172317909 -18.7173232 66.0866246 84.0316214 2023-Oct-17 00:00 0.370832697070 -18.3979392 66.2167929 84.2508219 2023-Oct-17 03:00 0.369516316441 -18.0734290 66.3453709 84.4692543 2023-Oct-17 06:00 0.368223545828 -17.7437990 66.4722928 84.6868366 2023-Oct-17 09:00 0.366954754412 -17.4090602 66.5974925 84.9034853 2023-Oct-17 12:00 0.365710310422 -17.0692279 66.7209030 85.1191156 2023-Oct-17 15:00 0.364490580809 -16.7243223 66.8424570 85.3336415 2023-Oct-17 18:00 0.363295930892 -16.3743685 66.9620868 85.5469757 2023-Oct-17 21:00 0.362126724014 -16.0193962 67.0797245 85.7590296 2023-Oct-18 00:00 0.360983321174 -15.6594405 67.1953020 85.9697139 2023-Oct-18 03:00 0.359866080656 -15.2945417 67.3087508 86.1789379 2023-Oct-18 06:00 0.358775357649 -14.9247453 67.4200027 86.3866105 2023-Oct-18 09:00 0.357711503864 -14.5501023 67.5289894 86.5926394 2023-Oct-18 12:00 0.356674867131 -14.1706690 67.6356428 86.7969321 2023-Oct-18 15:00 0.355665791008 -13.7865077 67.7398952 86.9993952 2023-Oct-18 18:00 0.354684614366 -13.3976859 67.8416791 87.1999351 2023-Oct-18 21:00 0.353731670986 -13.0042772 67.9409275 87.3984578 2023-Oct-19 00:00 0.352807289138 -12.6063608 68.0375742 87.5948693 2023-Oct-19 03:00 0.351911791166 -12.2040216 68.1315534 87.7890755 2023-Oct-19 06:00 0.351045493071 -11.7973505 68.2228003 87.9809823 2023-Oct-19 09:00 0.350208704087 -11.3864442 68.3112511 88.1704962 2023-Oct-19 12:00 0.349401726265 -10.9714050 68.3968431 88.3575238 2023-Oct-19 15:00 0.348624854050 -10.5523413 68.4795144 88.5419724 2023-Oct-19 18:00 0.347878373870 -10.1293669 68.5592050 88.7237500 2023-Oct-19 21:00 0.347162563720 -9.7026017 68.6358558 88.9027657 2023-Oct-20 00:00 0.346477692757 -9.2721707 68.7094095 89.0789292 2023-Oct-20 03:00 0.345824020899 -8.8382048 68.7798105 89.2521518 2023-Oct-20 06:00 0.345201798428 -8.4008402 68.8470048 89.4223461 2023-Oct-20 09:00 0.344611265610 -7.9602182 68.9109404 89.5894259 2023-Oct-20 12:00 0.344052652317 -7.5164854 68.9715674 89.7533071 2023-Oct-20 15:00 0.343526177663 -7.0697934 69.0288379 89.9139072 2023-Oct-20 18:00 0.343032049654 -6.6202983 69.0827062 90.0711457 2023-Oct-20 21:00 0.342570464847 -6.1681612 69.1331291 90.2249444 2023-Oct-21 00:00 0.342141608032 -5.7135472 69.1800658 90.3752274 2023-Oct-21 03:00 0.341745651922 -5.2566256 69.2234779 90.5219210 2023-Oct-21 06:00 0.341382756863 -4.7975697 69.2633297 90.6649543 2023-Oct-21 09:00 0.341053070561 -4.3365565 69.2995882 90.8042592 2023-Oct-21 12:00 0.340756727835 -3.8737662 69.3322234 90.9397703 2023-Oct-21 15:00 0.340493850380 -3.4093820 69.3612079 91.0714254 2023-Oct-21 18:00 0.340264546556 -2.9435902 69.3865173 91.1991652 2023-Oct-21 21:00 0.340068911202 -2.4765791 69.4081303 91.3229338 2023-Oct-22 00:00 0.339907025467 -2.0085396 69.4260285 91.4426787 2023-Oct-22 03:00 0.339778956669 -1.5396642 69.4401968 91.5583506 2023-Oct-22 06:00 0.339684758172 -1.0701468 69.4506231 91.6699040 2023-Oct-22 09:00 0.339624469295 -0.6001826 69.4572986 91.7772970 2023-Oct-22 12:00 0.339598115242 -0.1299676 69.4602173 91.8804911 2023-Oct-22 15:00 0.339605707053 0.3403019 69.4593770 91.9794519 2023-Oct-22 18:00 0.339647241588 0.8104294 69.4547783 92.0741487 2023-Oct-22 21:00 0.339722701533 1.2802186 69.4464251 92.1645547 2023-Oct-23 00:00 0.339832055427 1.7494740 69.4343246 92.2506468 2023-Oct-23 03:00 0.339975257720 2.2180008 69.4184871 92.3324060 2023-Oct-23 06:00 0.340152248858 2.6856056 69.3989260 92.4098173 2023-Oct-23 09:00 0.340362955380 3.1520968 69.3756579 92.4828694 2023-Oct-23 12:00 0.340607290056 3.6172845 69.3487026 92.5515551 2023-Oct-23 15:00 0.340885152036 4.0809812 69.3180826 92.6158711 2023-Oct-23 18:00 0.341196427028 4.5430020 69.2838238 92.6758178 2023-Oct-23 21:00 0.341540987496 5.0031649 69.2459546 92.7313997 2023-Oct-24 00:00 0.341918692881 5.4612912 69.2045065 92.7826249 2023-Oct-24 03:00 0.342329389841 5.9172055 69.1595138 92.8295054 2023-Oct-24 06:00 0.342772912516 6.3707363 69.1110131 92.8720568 2023-Oct-24 09:00 0.343249082801 6.8217160 69.0590441 92.9102982 2023-Oct-24 12:00 0.343757710650 7.2699812 69.0036486 92.9442525 2023-Oct-24 15:00 0.344298594386 7.7153733 68.9448711 92.9739457 2023-Oct-24 18:00 0.344871521033 8.1577378 68.8827580 92.9994074 2023-Oct-24 21:00 0.345476266658 8.5969256 68.8173583 93.0206704 2023-Oct-25 00:00 0.346112596730 9.0327923 68.7487229 93.0377706 2023-Oct-25 03:00 0.346780266487 9.4651989 68.6769046 93.0507467 2023-Oct-25 06:00 0.347479021318 9.8940115 68.6019581 93.0596407 2023-Oct-25 09:00 0.348208597150 10.3191018 68.5239398 93.0644972 2023-Oct-25 12:00 0.348968720846 10.7403470 68.4429079 93.0653633 2023-Oct-25 15:00 0.349759110609 11.1576301 68.3589218 93.0622889 2023-Oct-25 18:00 0.350579476389 11.5708395 68.2720425 93.0553260 2023-Oct-25 21:00 0.351429520304 11.9798697 68.1823321 93.0445290 2023-Oct-26 00:00 0.352308937047 12.3846206 68.0898539 93.0299546 2023-Oct-26 03:00 0.353217414316 12.7849984 67.9946723 93.0116611 2023-Oct-26 06:00 0.354154633223 13.1809147 67.8968523 92.9897090 2023-Oct-26 09:00 0.355120268726 13.5722871 67.7964601 92.9641601 2023-Oct-26 12:00 0.356113990035 13.9590390 67.6935621 92.9350783 2023-Oct-26 15:00 0.357135461040 14.3410994 67.5882257 92.9025284 2023-Oct-26 18:00 0.358184340715 14.7184033 67.4805184 92.8665768 2023-Oct-26 21:00 0.359260283532 15.0908910 67.3705081 92.8272910 2023-Oct-27 00:00 0.360362939863 15.4585085 67.2582631 92.7847395 2023-Oct-27 03:00 0.361491956381 15.8212072 67.1438517 92.7389917 2023-Oct-27 06:00 0.362646976445 16.1789441 67.0273421 92.6901179 2023-Oct-27 09:00 0.363827640490 16.5316813 66.9088026 92.6381887 2023-Oct-27 12:00 0.365033586403 16.8793859 66.7883014 92.5832757 2023-Oct-27 15:00 0.366264449888 17.2220303 66.6659063 92.5254506 2023-Oct-27 18:00 0.367519864826 17.5595917 66.5416847 92.4647854 2023-Oct-27 21:00 0.368799463623 17.8920521 66.4157039 92.4013524 2023-Oct-28 00:00 0.370102877554 18.2193980 66.2880304 92.3352240 2023-Oct-28 03:00 0.371429737085 18.5416206 66.1587303 92.2664725 2023-Oct-28 06:00 0.372779672197 18.8587153 66.0278692 92.1951701 2023-Oct-28 09:00 0.374152312693 19.1706816 65.8955116 92.1213888 2023-Oct-28 12:00 0.375547288490 19.4775233 65.7617218 92.0452005 2023-Oct-28 15:00 0.376964229912 19.7792478 65.6265628 91.9666763 2023-Oct-28 18:00 0.378402767955 20.0758663 65.4900971 91.8858873 2023-Oct-28 21:00 0.379862534559 20.3673938 65.3523863 91.8029039 2023-Oct-29 00:00 0.381343162851 20.6538482 65.2134907 91.7177957 2023-Oct-29 03:00 0.382844287390 20.9352512 65.0734701 91.6306320 2023-Oct-29 06:00 0.384365544394 21.2116272 64.9323830 91.5414811 2023-Oct-29 09:00 0.385906571955 21.4830036 64.7902868 91.4504108 2023-Oct-29 12:00 0.387467010248 21.7494107 64.6472381 91.3574877 2023-Oct-29 15:00 0.389046501724 22.0108813 64.5032922 91.2627778 2023-Oct-29 18:00 0.390644691292 22.2674507 64.3585034 91.1663462 2023-Oct-29 21:00 0.392261226494 22.5191566 64.2129247 91.0682569 2023-Oct-30 00:00 0.393895757669 22.7660386 64.0666081 90.9685728 2023-Oct-30 03:00 0.395547938100 23.0081388 63.9196044 90.8673562 2023-Oct-30 06:00 0.397217424160 23.2455007 63.7719631 90.7646678 2023-Oct-30 09:00 0.398903875441 23.4781699 63.6237328 90.6605677 2023-Oct-30 12:00 0.400606954882 23.7061936 63.4749607 90.5551146 2023-Oct-30 15:00 0.402326328872 23.9296202 63.3256928 90.4483660 2023-Oct-30 18:00 0.404061667363 24.1484999 63.1759740 90.3403787 2023-Oct-30 21:00 0.405812643961 24.3628839 63.0258480 90.2312079 2023-Oct-31 00:00 0.407578936012 24.5728245 62.8753572 90.1209077 $$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 = '90000090' QUANTITIES = '19,22' START_TIME = '2023-10-15' STEP_SIZE = '3 hours' STOP_TIME = '2023-10-31'