******************************************************************************* JPL/HORIZONS 2P/Encke 2024-May-08 19:33:55 Rec #:90000037 Soln.date: - # obs: 87 (1818-1832) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2389080.5 ! 1828-Dec-24.0000000 (TDB) RMSW= n.a. EC= .8446399999999999 QR= .345447 TP= 2389097.7434 OM= 336.9003 W= 182.7893 IN= 13.3652 A= 2.223526004119464 MA= 354.8741763877812 ADIST= 4.101605008238927 PER= 3.3156716930688 N= .29726293 ANGMOM= .013731816 DAN= 4.07536 DDN= .34563 L= 159.6141704 B= -.6445252 TP= 1829-Jan-10.2434000000 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.= SAO/1829 2: k1=4.5;epoch may be 2389081.0 (hour ambiguous: 12h/0h); non-gravs. considered; 2 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed May 8 19:33:55 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 2P/Encke {source: SAO/182920} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1828-Nov-05 00:00:00.0000 UT Stop time : A.D. 1829-Jan-11 00:00:00.0000 UT Step-size : 1440 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.240508.p240801 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-08. PREDICTS-> 2024-JUL-31 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= 2389080.5 ! 1828-Dec-24.0000000 (TDB) RMSW= n.a. EC= .8446399999999999 QR= .345447 TP= 2389097.7434 OM= 336.9003 W= 182.7893 IN= 13.3652 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 9.405733005811096E-02 Y= 4.395345052962518E-01 Z= 3.271743389412632E-01 VX=-2.727330202049848E-02 VY=-9.477981301586004E-03 VZ=-9.888406037603227E-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 delta deldot S-O-T /r ********************************************************************************************* $$SOE 1828-Nov-05 00:00 1.361984695512 -24.4740913 0.52574944452381 -7.1460648 124.9705 /T 1828-Nov-06 00:00 1.347806787398 -24.6219363 0.52175550230099 -6.6861334 123.0260 /T 1828-Nov-07 00:00 1.333543012388 -24.7715119 0.51802228402170 -6.2434499 121.0674 /T 1828-Nov-08 00:00 1.319192364529 -24.9228381 0.51453953255306 -5.8190197 119.0969 /T 1828-Nov-09 00:00 1.304753826609 -25.0759337 0.51129644173590 -5.4137338 117.1168 /T 1828-Nov-10 00:00 1.290226371037 -25.2308156 0.50828173040587 -5.0283414 115.1289 /T 1828-Nov-11 00:00 1.275608960892 -25.3874989 0.50548373117308 -4.6634270 113.1352 /T 1828-Nov-12 00:00 1.260900551173 -25.5459963 0.50289049057819 -4.3193949 111.1372 /T 1828-Nov-13 00:00 1.246100090258 -25.7063179 0.50048987523691 -3.9964637 109.1363 /T 1828-Nov-14 00:00 1.231206521627 -25.8684704 0.49826967804820 -3.6946712 107.1337 /T 1828-Nov-15 00:00 1.216218785869 -26.0324569 0.49621771944330 -3.4138867 105.1305 /T 1828-Nov-16 00:00 1.201135823013 -26.1982762 0.49432194024524 -3.1538270 103.1274 /T 1828-Nov-17 00:00 1.185956575244 -26.3659219 0.49257048418476 -2.9140758 101.1252 /T 1828-Nov-18 00:00 1.170679990048 -26.5353819 0.49095176914955 -2.6941033 99.1244 /T 1828-Nov-19 00:00 1.155305023849 -26.7066372 0.48945454709412 -2.4932855 97.1253 /T 1828-Nov-20 00:00 1.139830646225 -26.8796611 0.48806795366803 -2.3109200 95.1280 /T 1828-Nov-21 00:00 1.124255844766 -27.0544179 0.48678155019271 -2.1462363 93.1325 /T 1828-Nov-22 00:00 1.108579630697 -27.2308613 0.48558536223777 -1.9983968 91.1388 /T 1828-Nov-23 00:00 1.092801045358 -27.4089330 0.48446991996131 -1.8664899 89.1466 /T 1828-Nov-24 00:00 1.076919167698 -27.5885609 0.48342630503427 -1.7495146 87.1554 /T 1828-Nov-25 00:00 1.060933122910 -27.7696567 0.48244620745230 -1.6463622 85.1648 /T 1828-Nov-26 00:00 1.044842092412 -27.9521137 0.48152199353882 -1.5557966 83.1740 /T 1828-Nov-27 00:00 1.028645325370 -28.1358038 0.48064678476610 -1.4764362 81.1822 /T 1828-Nov-28 00:00 1.012342152005 -28.3205740 0.47981454614801 -1.4067394 79.1885 /T 1828-Nov-29 00:00 0.995931998982 -28.5062429 0.47902018291773 -1.3449902 77.1918 /T 1828-Nov-30 00:00 0.979414407213 -28.6925958 0.47825964475355 -1.2892858 75.1909 /T 1828-Dec-01 00:00 0.962789052461 -28.8793798 0.47753003768259 -1.2375225 73.1844 /T 1828-Dec-02 00:00 0.946055769222 -29.0662974 0.47682974481008 -1.1873789 71.1711 /T 1828-Dec-03 00:00 0.929214578435 -29.2529997 0.47615855813929 -1.1362939 69.1492 /T 1828-Dec-04 00:00 0.912265719655 -29.4390776 0.47551782494839 -1.0814376 67.1171 /T 1828-Dec-05 00:00 0.895209688471 -29.6240523 0.47491061333957 -1.0196742 65.0731 /T 1828-Dec-06 00:00 0.878047280082 -29.8073637 0.47434190228447 -0.9475144 63.0154 /T 1828-Dec-07 00:00 0.860779640098 -29.9883569 0.47381880106613 -0.8610614 60.9419 /T 1828-Dec-08 00:00 0.843408323866 -30.1662658 0.47335080077076 -0.7559555 58.8509 /T 1828-Dec-09 00:00 0.825935365849 -30.3401949 0.47295005640539 -0.6273248 56.7401 /T 1828-Dec-10 00:00 0.808363360880 -30.5090964 0.47263169363236 -0.4697499 54.6077 /T 1828-Dec-11 00:00 0.790695559469 -30.6717439 0.47241413135515 -0.2772440 52.4517 /T 1828-Dec-12 00:00 0.772935979767 -30.8267011 0.47231941215425 -0.0432446 50.2701 /T 1828-Dec-13 00:00 0.755089539288 -30.9722848 0.47237353626163 0.2393918 48.0613 /T 1828-Dec-14 00:00 0.737162210101 -31.1065200 0.47260679873741 0.5783961 45.8238 /T 1828-Dec-15 00:00 0.719161201897 -31.2270879 0.47305413118140 0.9820955 43.5563 /T 1828-Dec-16 00:00 0.701095178205 -31.3312635 0.47375544784761 1.4594191 41.2583 /T 1828-Dec-17 00:00 0.682974511973 -31.4158407 0.47475599230075 2.0198926 38.9295 /T 1828-Dec-18 00:00 0.664811587861 -31.4770452 0.47610667609578 2.6736148 36.5707 /T 1828-Dec-19 00:00 0.646621159847 -31.5104297 0.47786439619744 3.4312064 34.1836 /T 1828-Dec-20 00:00 0.628420774088 -31.5107522 0.48009231306840 4.3037239 31.7711 /T 1828-Dec-21 00:00 0.610231268378 -31.4718322 0.48286006617696 5.3025271 29.3378 /T 1828-Dec-22 00:00 0.592077360806 -31.3863847 0.48624389769753 6.4390919 26.8905 /T 1828-Dec-23 00:00 0.573988341165 -31.2458306 0.49032664823029 7.7247526 24.4387 /T 1828-Dec-24 00:00 0.555998878804 -31.0400830 0.49519758059184 9.1703616 21.9960 /T 1828-Dec-25 00:00 0.538149959362 -30.7573152 0.50095197943710 10.7858513 19.5811 /T 1828-Dec-26 00:00 0.520489959127 -30.3837183 0.50769046590433 12.5796828 17.2209 /T 1828-Dec-27 00:00 0.503075858069 -29.9032666 0.51551795766950 14.5581662 14.9546 /T 1828-Dec-28 00:00 0.485974578732 -29.2975222 0.52454219568175 16.7246370 12.8404 /T 1828-Dec-29 00:00 0.469264415255 -28.5455284 0.53487174971256 19.0784718 10.9671 /T 1828-Dec-30 00:00 0.453036481030 -27.6238659 0.54661340707994 21.6139345 9.4660 /T 1828-Dec-31 00:00 0.437396051191 -26.5069810 0.55986884624532 24.3188548 8.5050 /L 1829-Jan-01 00:00 0.422463604339 -25.1679251 0.57473050696692 27.1731748 8.2248 /L 1829-Jan-02 00:00 0.408375277620 -23.5796758 0.59127660417622 30.1474574 8.6269 /L 1829-Jan-03 00:00 0.395282349541 -21.7172093 0.60956531219773 33.2015429 9.5531 /L 1829-Jan-04 00:00 0.383349279395 -19.5604378 0.62962829069399 36.2836747 10.7947 /L 1829-Jan-05 00:00 0.372749804323 -17.0979756 0.65146394935175 39.3305538 12.1817 /L 1829-Jan-06 00:00 0.363660688684 -14.3314266 0.67503114756098 42.2688843 13.5999 /L 1829-Jan-07 00:00 0.356253003363 -11.2795074 0.70024434497904 45.0189219 14.9768 /L 1829-Jan-08 00:00 0.350681318830 -7.9809540 0.72697144179618 47.5002353 16.2677 /L 1829-Jan-09 00:00 0.347071867336 -4.4949937 0.75503550569632 49.6392801 17.4459 /L 1829-Jan-10 00:00 0.345511375566 -0.8984503 0.78422112678657 51.3776005 18.4978 /L 1829-Jan-11 00:00 0.346038595471 2.7206354 0.81428526106720 52.6788560 19.4188 /L $$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 '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 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 = '90000037' START_TIME = '1828-11-05' STOP_TIME = '1829-01-11' STEP_SIZE = '1 day' QUANTITIES = '19,20,23'