API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 52P/Harrington-Abell 2024-May-03 15:05:49 Rec #:90000606 (+COV) Soln.date: 2023-Dec-07_09:27:11 # obs: 1164 (2013-2022) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457578.5 ! 2016-Jul-09.0000000 (TDB) RMSW= n.a. EC= .540048863643431 QR= 1.775053615559263 TP= 2456723.8566054609 OM= 336.8356805332962 W= 139.6607051308085 IN= 10.23176237340895 A= 3.859222154814253 MA= 111.1064688722204 ADIST= 5.943390694069244 PER= 7.5815476912969 N= .130003308 ANGMOM= .028441627 DAN= 4.64624 DDN= 1.93652 L= 116.9489553 B= 6.6026072 MOID= .80361903 TP= 2014-Mar-07.3566054609 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 1.3 M1= 11.8 M2= 15.5 k1= 16. 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= -4.80405151844E-9 A2= -7.654172368348E-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#K212/21, data arc: 2013-10-01 to 2022-05-26 2: k1=16., k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Fri May 3 15:05:49 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 52P/Harrington-Abell {source: JPL#K212/21} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2029-May-08 00:00:00.0000 UT Stop time : A.D. 2029-May-12 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 1.3 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.240503.p240727 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-03. PREDICTS-> 2024-JUL-26 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= 2457578.5 ! 2016-Jul-09.0000000 (TDB) RMSW= n.a. EC= .540048863643431 QR= 1.775053615559263 TP= 2456723.8566054609 OM= 336.8356805332962 W= 139.6607051308085 IN= 10.23176237340895 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 3.899080312536229E-02 Y=-4.448954737674003E+00 Z=-2.870678028651162E+00 VX= 5.376681592216750E-03 VY=-2.269802331703044E-03 VZ=-1.017886706680847E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 1.3 M1= 11.8 M2= 15.5 k1= 16. 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= -4.80405151844E-9 A2= -7.654172368348E-11 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2029-May-08 00:00 1.772164546963 -0.2016748 2029-May-08 03:00 1.772150385712 -0.1906514 2029-May-08 06:00 1.772137020266 -0.1796277 2029-May-08 09:00 1.772124450653 -0.1686035 2029-May-08 12:00 1.772112676903 -0.1575790 2029-May-08 15:00 1.772101699039 -0.1465541 2029-May-08 18:00 1.772091517085 -0.1355289 2029-May-08 21:00 1.772082131064 -0.1245034 2029-May-09 00:00 1.772073540996 -0.1134777 2029-May-09 03:00 1.772065746899 -0.1024516 2029-May-09 06:00 1.772058748791 -0.0914254 2029-May-09 09:00 1.772052546686 -0.0803990 2029-May-09 12:00 1.772047140597 -0.0693724 2029-May-09 15:00 1.772042530538 -0.0583457 2029-May-09 18:00 1.772038716516 -0.0473188 2029-May-09 21:00 1.772035698541 -0.0362918 2029-May-10 00:00 1.772033476618 -0.0252648 2029-May-10 03:00 1.772032050754 -0.0142377 2029-May-10 06:00 1.772031420949 -0.0032105 2029-May-10 09:00 1.772031587207 0.0078166 2029-May-10 12:00 1.772032549526 0.0188437 2029-May-10 15:00 1.772034307904 0.0298708 2029-May-10 18:00 1.772036862337 0.0408978 2029-May-10 21:00 1.772040212819 0.0519247 2029-May-11 00:00 1.772044359343 0.0629515 2029-May-11 03:00 1.772049301900 0.0739782 2029-May-11 06:00 1.772055040479 0.0850047 2029-May-11 09:00 1.772061575067 0.0960310 2029-May-11 12:00 1.772068905650 0.1070571 2029-May-11 15:00 1.772077032212 0.1180829 2029-May-11 18:00 1.772085954734 0.1291086 2029-May-11 21:00 1.772095673198 0.1401339 2029-May-12 00:00 1.772106187582 0.1511589 $$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 *******************************************************************************