API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 55P/Tempel-Tuttle 2024-May-02 02:35:34 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 Thu May 2 02:35:34 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. 2031-May-20 23:40:00.0000 UT Stop time : A.D. 2031-May-20 23:50:00.0000 UT Step-size : 30 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 ********************************************************* $$SOE 2031-May-20 23:40:00.000 0.964370832730 -0.0020425 2031-May-20 23:40:20.000 0.964370832465 -0.0019267 2031-May-20 23:40:40.000 0.964370832215 -0.0018109 2031-May-20 23:41:00.000 0.964370831981 -0.0016952 2031-May-20 23:41:20.000 0.964370831762 -0.0015794 2031-May-20 23:41:40.000 0.964370831558 -0.0014636 2031-May-20 23:42:00.000 0.964370831371 -0.0013479 2031-May-20 23:42:20.000 0.964370831198 -0.0012321 2031-May-20 23:42:40.000 0.964370831041 -0.0011163 2031-May-20 23:43:00.000 0.964370830900 -0.0010006 2031-May-20 23:43:20.000 0.964370830774 -0.0008848 2031-May-20 23:43:40.000 0.964370830663 -0.0007690 2031-May-20 23:44:00.000 0.964370830568 -0.0006533 2031-May-20 23:44:20.000 0.964370830488 -0.0005375 2031-May-20 23:44:40.000 0.964370830424 -0.0004217 2031-May-20 23:45:00.000 0.964370830376 -0.0003059 2031-May-20 23:45:20.000 0.964370830342 -0.0001902 2031-May-20 23:45:40.000 0.964370830325 -0.0000744 2031-May-20 23:46:00.000 0.964370830323 0.0000414 2031-May-20 23:46:20.000 0.964370830336 0.0001571 2031-May-20 23:46:40.000 0.964370830365 0.0002729 2031-May-20 23:47:00.000 0.964370830409 0.0003887 2031-May-20 23:47:20.000 0.964370830468 0.0005044 2031-May-20 23:47:40.000 0.964370830544 0.0006202 2031-May-20 23:48:00.000 0.964370830634 0.0007360 2031-May-20 23:48:20.000 0.964370830740 0.0008517 2031-May-20 23:48:40.000 0.964370830862 0.0009675 2031-May-20 23:49:00.000 0.964370830999 0.0010833 2031-May-20 23:49:20.000 0.964370831152 0.0011990 2031-May-20 23:49:40.000 0.964370831320 0.0013148 2031-May-20 23:50:00.000 0.964370831503 0.0014306 $$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 *******************************************************************************