******************************************************************************* JPL/HORIZONS 1P/Halley 2024-May-13 08:21:40 Rec #:90000030 Soln.date: 2024-Apr-16_14:38:13 # obs: 8518 (1835-1994) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2439907.5 ! 1968-Feb-21.0000000 (TDB) RMSW= n.a. EC= .9679221169240834 QR= .575157544193894 TP= 2446469.6983372075 OM= 59.07198712310091 W= 112.2128395742619 IN= 162.1951462980701 A= 17.93003431157555 MA= 274.8113481508292 ADIST= 35.28491107895721 PER= 75.924140333742 N= .012981725 ANGMOM= .018301168 DAN= 1.78505 DDN= .82865 L= 305.8576622 B= 16.4442985 MOID= .0744805 TP= 1986-Feb-08.1983372075 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 5.5 M1= 5.5 M2= 13.6 k1= 8. 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= 4.887227714062E-10 A2= 1.554720848799E-10 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#74, data arc: 1835-08-21 to 1994-01-11 2: k1=8.0, k2=5.0, phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Mon May 13 08:21:40 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 1P/Halley {source: JPL#74} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2061-Jul-28 17:00:00.0000 UT Stop time : A.D. 2061-Jul-28 18:00:00.0000 UT Step-size : 1 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 5.5 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.240510.p240803 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-10. PREDICTS-> 2024-AUG-02 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= 2439907.5 ! 1968-Feb-21.0000000 (TDB) RMSW= n.a. EC= .9679221169240834 QR= .575157544193894 TP= 2446469.6983372075 OM= 59.07198712310091 W= 112.2128395742619 IN= 162.1951462980701 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.326479811754316E+01 Y= 2.536681640257868E+01 Z= 2.638853433023532E+00 VX= 1.424523564115578E-03 VY=-1.432724119466060E-03 VZ= 4.019525745942034E-05 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 5.5 M1= 5.5 M2= 13.6 k1= 8. 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= 4.887227714062E-10 A2= 1.554720848799E-10 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 2061-Jul-28 17:00 0.592782035457 -0.0193876 2061-Jul-28 17:01 0.592782027877 -0.0184088 2061-Jul-28 17:02 0.592782020690 -0.0174301 2061-Jul-28 17:03 0.592782013896 -0.0164513 2061-Jul-28 17:04 0.592782007493 -0.0154726 2061-Jul-28 17:05 0.592782001484 -0.0144938 2061-Jul-28 17:06 0.592781995867 -0.0135151 2061-Jul-28 17:07 0.592781990643 -0.0125363 2061-Jul-28 17:08 0.592781985811 -0.0115576 2061-Jul-28 17:09 0.592781981371 -0.0105788 2061-Jul-28 17:10 0.592781977325 -0.0096001 2061-Jul-28 17:11 0.592781973671 -0.0086213 2061-Jul-28 17:12 0.592781970409 -0.0076426 2061-Jul-28 17:13 0.592781967540 -0.0066638 2061-Jul-28 17:14 0.592781965063 -0.0056851 2061-Jul-28 17:15 0.592781962980 -0.0047063 2061-Jul-28 17:16 0.592781961288 -0.0037276 2061-Jul-28 17:17 0.592781959989 -0.0027488 2061-Jul-28 17:18 0.592781959083 -0.0017701 2061-Jul-28 17:19 0.592781958570 -0.0007913 2061-Jul-28 17:20 0.592781958448 0.0001874 2061-Jul-28 17:21 0.592781958720 0.0011662 2061-Jul-28 17:22 0.592781959384 0.0021449 2061-Jul-28 17:23 0.592781960440 0.0031237 2061-Jul-28 17:24 0.592781961890 0.0041024 2061-Jul-28 17:25 0.592781963731 0.0050812 2061-Jul-28 17:26 0.592781965966 0.0060599 2061-Jul-28 17:27 0.592781968592 0.0070387 2061-Jul-28 17:28 0.592781971612 0.0080174 2061-Jul-28 17:29 0.592781975024 0.0089962 2061-Jul-28 17:30 0.592781978828 0.0099749 2061-Jul-28 17:31 0.592781983025 0.0109537 2061-Jul-28 17:32 0.592781987615 0.0119324 2061-Jul-28 17:33 0.592781992597 0.0129111 2061-Jul-28 17:34 0.592781997972 0.0138899 2061-Jul-28 17:35 0.592782003739 0.0148686 2061-Jul-28 17:36 0.592782009899 0.0158474 2061-Jul-28 17:37 0.592782016451 0.0168261 2061-Jul-28 17:38 0.592782023396 0.0178049 2061-Jul-28 17:39 0.592782030734 0.0187836 2061-Jul-28 17:40 0.592782038464 0.0197624 2061-Jul-28 17:41 0.592782046587 0.0207411 2061-Jul-28 17:42 0.592782055102 0.0217199 2061-Jul-28 17:43 0.592782064010 0.0226986 2061-Jul-28 17:44 0.592782073310 0.0236774 2061-Jul-28 17:45 0.592782083003 0.0246561 2061-Jul-28 17:46 0.592782093088 0.0256349 2061-Jul-28 17:47 0.592782103566 0.0266136 2061-Jul-28 17:48 0.592782114437 0.0275924 2061-Jul-28 17:49 0.592782125700 0.0285711 2061-Jul-28 17:50 0.592782137356 0.0295499 2061-Jul-28 17:51 0.592782149404 0.0305286 2061-Jul-28 17:52 0.592782161845 0.0315073 2061-Jul-28 17:53 0.592782174678 0.0324861 2061-Jul-28 17:54 0.592782187904 0.0334648 2061-Jul-28 17:55 0.592782201523 0.0344436 2061-Jul-28 17:56 0.592782215534 0.0354223 2061-Jul-28 17:57 0.592782229937 0.0364011 2061-Jul-28 17:58 0.592782244733 0.0373798 2061-Jul-28 17:59 0.592782259922 0.0383586 2061-Jul-28 18:00 0.592782275503 0.0393373 $$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 ******************************************************************************* !$$SOF COMMAND = '90000030' START_TIME = '2061-Jul-28 17:00' STOP_TIME = '2061-Jul-28 18:00' STEP_SIZE = '1 min' QUANTITIES = '19'