API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 55P/Tempel-Tuttle 2024-May-01 22:37:49 Rec #:90000623 (+COV) Soln.date: 2002-Jan-03_16:05:39 # obs: 392 (1865-1998) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2451040.5 ! 1998-Aug-15.0000000 (TDB) RMSW= n.a. EC= .9055527209724122 QR= .9764279154675056 TP= 2450872.5977341123 OM= 235.270989149082 W= 172.5002736828059 IN= 162.4865753794343 A= 10.33833822975773 MA= 4.978339684690188 ADIST= 19.70024854404794 PER= 33.241782758462 N= .029650223 ANGMOM= .023464539 DAN= 18.20692 DDN= .98041 L= 62.4267664 B= 2.2510269 MOID= .00848081 TP= 1998-Feb-28.0977341123 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 1.8 M1= 10. M2= 16. k1= 25. k2= 10. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 1.580981463194E-9 A2= 9.186415933073E-11 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#J985/69, data arc: 1865-12-22 to 1998-07-05 2: k1=25.0, k2=10.0; ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Wed May 1 22:37:49 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 55P/Tempel-Tuttle {source: JPL#J985/69} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1832-Dec-01 00:00:00.0000 UT Stop time : A.D. 1832-Dec-31 00:00:00.0000 UT Step-size : 60 steps ******************************************************************************* Target pole/equ : undefined Target radii : 1.8 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.240501.p240725 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-01. PREDICTS-> 2024-JUL-24 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= 2451040.5 ! 1998-Aug-15.0000000 (TDB) RMSW= n.a. EC= .9055527209724122 QR= .9764279154675056 TP= 2450872.5977341123 OM= 235.270989149082 W= 172.5002736828059 IN= 162.4865753794343 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 1.722008948564083E+00 Y=-1.306804387064573E+00 Z=-1.397143536382815E+00 VX= 8.841891235487663E-04 VY=-1.166410808784401E-02 VZ=-8.029643799443813E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 1.8 M1= 10. M2= 16. k1= 25. k2= 10. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 1.580981463194E-9 A2= 9.186415933073E-11 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 **************************************************************************************************** Date__(UT)__HR:MN:SC.fff r rdot delta deldot S-O-T /r **************************************************************************************************** $$SOE 1832-Dec-01 00:00:00.000 1.119087879919 -13.2205559 0.63432903027268 -65.2818401 84.4238 /L 1832-Dec-01 12:00:00.000 1.115289219857 -13.0822310 0.61548090538261 -65.2374541 84.9743 /L 1832-Dec-02 00:00:00.000 1.111530818940 -12.9417916 0.59664836033598 -65.1736029 85.5292 /L 1832-Dec-02 12:00:00.000 1.107813289651 -12.7992274 0.57783732088109 -65.0881316 86.0891 /L 1832-Dec-03 00:00:00.000 1.104137247389 -12.6545288 0.55905438436588 -64.9785343 86.6540 /L 1832-Dec-03 12:00:00.000 1.100503310224 -12.5076870 0.54030693083094 -64.8418844 87.2244 /L 1832-Dec-04 00:00:00.000 1.096912098642 -12.3586942 0.52160325660015 -64.6747479 87.8006 /L 1832-Dec-04 12:00:00.000 1.093364235281 -12.2075435 0.50295273564914 -64.4730771 88.3829 /L 1832-Dec-05 00:00:00.000 1.089860344653 -12.0542292 0.48436601541886 -64.2320773 88.9718 /L 1832-Dec-05 12:00:00.000 1.086401052860 -11.8987463 0.46585525549648 -63.9460418 89.5675 /L 1832-Dec-06 00:00:00.000 1.082986987294 -11.7410911 0.44743441983634 -63.6081448 90.1705 /L 1832-Dec-06 12:00:00.000 1.079618776336 -11.5812609 0.42911963605438 -63.2101819 90.7811 /L 1832-Dec-07 00:00:00.000 1.076297049034 -11.4192544 0.41092963895631 -62.7422436 91.3996 /L 1832-Dec-07 12:00:00.000 1.073022434783 -11.2550711 0.39288632001082 -62.1923050 92.0262 /L 1832-Dec-08 00:00:00.000 1.069795562985 -11.0887120 0.37501541012425 -61.5457090 92.6610 /L 1832-Dec-08 12:00:00.000 1.066617062714 -10.9201794 0.35734732983713 -60.7845192 93.3039 /L 1832-Dec-09 00:00:00.000 1.063487562363 -10.7494767 0.33991824885810 -59.8867128 93.9542 /L 1832-Dec-09 12:00:00.000 1.060407689293 -10.5766090 0.32277140501190 -58.8251869 94.6110 /L 1832-Dec-10 00:00:00.000 1.057378069471 -10.4015824 0.30595873959778 -57.5665592 95.2723 /L 1832-Dec-10 12:00:00.000 1.054399327106 -10.2244048 0.28954290833269 -56.0697710 95.9352 /L 1832-Dec-11 00:00:00.000 1.051472084287 -10.0450853 0.27359971749694 -54.2845579 96.5950 /L 1832-Dec-11 12:00:00.000 1.048596960603 -9.8636348 0.25822100069695 -52.1499713 97.2446 /L 1832-Dec-12 00:00:00.000 1.045774572767 -9.6800655 0.24351787064895 -49.5933498 97.8736 /L 1832-Dec-12 12:00:00.000 1.043005534213 -9.4943912 0.22962411789709 -46.5304923 98.4671 /L 1832-Dec-13 00:00:00.000 1.040290454665 -9.3066277 0.21669923861862 -42.8683141 99.0044 /L 1832-Dec-13 12:00:00.000 1.037629939642 -9.1167920 0.20493011566999 -38.5118741 99.4580 /L 1832-Dec-14 00:00:00.000 1.035024589864 -8.9249031 0.19452976575879 -33.3780245 99.7932 /L 1832-Dec-14 12:00:00.000 1.032475000507 -8.7309814 0.18573097823782 -27.4172305 99.9694 /L 1832-Dec-15 00:00:00.000 1.029981760269 -8.5350492 0.17877258478832 -20.6421365 99.9446 /L 1832-Dec-15 12:00:00.000 1.027545450257 -8.3371302 0.17387729600187 -13.1555954 99.6828 /T 1832-Dec-16 00:00:00.000 1.025166642777 -8.1372498 0.17122313532530 -5.1643248 99.1641 /T 1832-Dec-16 12:00:00.000 1.022845900241 -7.9354348 0.17091485068565 3.0364811 98.3930 /T 1832-Dec-17 00:00:00.000 1.020583774414 -7.7317136 0.17296462163723 11.1111509 97.4001 /T 1832-Dec-17 12:00:00.000 1.018380806160 -7.5261161 0.17728966871293 18.7484882 96.2371 /T 1832-Dec-18 00:00:00.000 1.016237525633 -7.3186739 0.18372777368112 25.7163279 94.9644 /T 1832-Dec-18 12:00:00.000 1.014154452676 -7.1094201 0.19206441985340 31.8856334 93.6393 /T 1832-Dec-19 00:00:00.000 1.012132097179 -6.8983896 0.20206213866574 37.2230748 92.3083 /T 1832-Dec-19 12:00:00.000 1.010170959198 -6.6856191 0.21348465743383 41.7651580 91.0042 /T 1832-Dec-20 00:00:00.000 1.008271528808 -6.4711469 0.22611275925351 45.5888170 89.7470 /T 1832-Dec-20 12:00:00.000 1.006434285731 -6.2550132 0.23975231884092 48.7875498 88.5467 /T 1832-Dec-21 00:00:00.000 1.004659698818 -6.0372599 0.25423662703268 51.4557610 87.4065 /T 1832-Dec-21 12:00:00.000 1.002948225457 -5.8179304 0.26942527561216 53.6802568 86.3255 /T 1832-Dec-22 00:00:00.000 1.001300310958 -5.5970701 0.28520135442340 55.5366772 85.3001 /T 1832-Dec-22 12:00:00.000 0.999716387947 -5.3747258 0.30146808085762 57.0888364 84.3258 /T 1832-Dec-23 00:00:00.000 0.998196875777 -5.1509461 0.31814547912244 58.3895363 83.3976 /T 1832-Dec-23 12:00:00.000 0.996742179968 -4.9257810 0.33516739696678 59.4819811 82.5106 /T 1832-Dec-24 00:00:00.000 0.995352691675 -4.6992822 0.35247895725316 60.4013190 81.6601 /T 1832-Dec-24 12:00:00.000 0.994028787183 -4.4715029 0.37003444382150 61.1760845 80.8421 /T 1832-Dec-25 00:00:00.000 0.992770827432 -4.2424976 0.38779557751862 61.8294503 80.0528 /T 1832-Dec-25 12:00:00.000 0.991579157556 -4.0123224 0.40573012400396 62.3802735 79.2888 /T 1832-Dec-26 00:00:00.000 0.990454106461 -3.7810346 0.42381077497015 62.8439476 78.5472 /T 1832-Dec-26 12:00:00.000 0.989395986410 -3.5486930 0.44201425062576 63.2330872 77.8256 /T 1832-Dec-27 00:00:00.000 0.988405092637 -3.3153573 0.46032057935757 63.5580752 77.1217 /T 1832-Dec-27 12:00:00.000 0.987481702986 -3.0810888 0.47871251850537 63.8274973 76.4335 /T 1832-Dec-28 00:00:00.000 0.986626077562 -2.8459496 0.49717508726901 64.0484877 75.7594 /T 1832-Dec-28 12:00:00.000 0.985838458412 -2.6100029 0.51569518872211 64.2270031 75.0980 /T 1832-Dec-29 00:00:00.000 0.985119069225 -2.3733129 0.53426130274477 64.3680425 74.4479 /T 1832-Dec-29 12:00:00.000 0.984468115049 -2.1359449 0.55286323553127 64.4758210 73.8079 /T 1832-Dec-30 00:00:00.000 0.983885782040 -1.8979647 0.57149191439282 64.5539108 73.1772 /T 1832-Dec-30 12:00:00.000 0.983372237227 -1.6594391 0.59013921893812 64.6053537 72.5548 /T 1832-Dec-31 00:00:00.000 0.982927628302 -1.4204355 0.60879784160107 64.6327524 71.9400 /T $$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 ****************************************************************************************************