******************************************************************************* JPL/HORIZONS 1P/Halley 2023-Nov-29 20:04:05 Rec #:90000030 Soln.date: 2022-Jun-07_13:24:35 # obs: 8548 (1835-1994) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2439857.5 ! 1968-Jan-02.0000000 (TDB) RMSW= n.a. EC= .9679427911271 QR= .5747157977675837 TP= 2446470.1488983454 OM= 59.11448293673941 W= 112.257792004868 IN= 162.1878711908339 A= 17.92781773504393 MA= 274.1404919498392 ADIST= 35.28091967232027 PER= 75.91006173829101 N= .012984132 ANGMOM= .018294235 DAN= 1.7857 DDN= .82759 L= 305.8527835 B= 16.4455591 MOID= .0752736 TP= 1986-Feb-08.6488983454 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= 4.823267459869E-10 A2= 1.554713398218E-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#73, data arc: 1835-08-21 to 1994-01-11 2: k1=8.0, k2=5.0, phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed Nov 29 20:04:05 2023 Pasadena, USA / Horizons ******************************************************************************* Target body name: 1P/Halley {source: JPL#73} 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.231128.p240221 EOP coverage : DATA-BASED 1962-JAN-20 TO 2023-NOV-28. PREDICTS-> 2024-FEB-20 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= 2439857.5 ! 1968-Jan-02.0000000 (TDB) RMSW= n.a. EC= .9679427911271 QR= .5747157977675837 TP= 2446470.1488983454 OM= 59.11448293673941 W= 112.257792004868 IN= 162.1878711908339 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.333580711037850E+01 Y= 2.543805202833605E+01 Z= 2.636800024594010E+00 VX= 1.415824036915183E-03 VY=-1.416718165237950E-03 VZ= 4.194435401575923E-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= 4.823267459869E-10 A2= 1.554713398218E-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 0.592782040949 -0.0193566 2061-Jul-28 17:01 0.592782033381 -0.0183778 2061-Jul-28 17:02 0.592782026207 -0.0173991 2061-Jul-28 17:03 0.592782019424 -0.0164203 2061-Jul-28 17:04 0.592782013035 -0.0154416 2061-Jul-28 17:05 0.592782007038 -0.0144628 2061-Jul-28 17:06 0.592782001433 -0.0134841 2061-Jul-28 17:07 0.592781996221 -0.0125053 2061-Jul-28 17:08 0.592781991402 -0.0115266 2061-Jul-28 17:09 0.592781986975 -0.0105478 2061-Jul-28 17:10 0.592781982940 -0.0095691 2061-Jul-28 17:11 0.592781979299 -0.0085903 2061-Jul-28 17:12 0.592781976050 -0.0076116 2061-Jul-28 17:13 0.592781973193 -0.0066328 2061-Jul-28 17:14 0.592781970729 -0.0056541 2061-Jul-28 17:15 0.592781968657 -0.0046753 2061-Jul-28 17:16 0.592781966979 -0.0036966 2061-Jul-28 17:17 0.592781965692 -0.0027178 2061-Jul-28 17:18 0.592781964798 -0.0017391 2061-Jul-28 17:19 0.592781964297 -0.0007603 2061-Jul-28 17:20 0.592781964188 0.0002184 2061-Jul-28 17:21 0.592781964472 0.0011972 2061-Jul-28 17:22 0.592781965149 0.0021759 2061-Jul-28 17:23 0.592781966218 0.0031546 2061-Jul-28 17:24 0.592781967679 0.0041334 2061-Jul-28 17:25 0.592781969533 0.0051121 2061-Jul-28 17:26 0.592781971780 0.0060909 2061-Jul-28 17:27 0.592781974419 0.0070696 2061-Jul-28 17:28 0.592781977451 0.0080484 2061-Jul-28 17:29 0.592781980876 0.0090271 2061-Jul-28 17:30 0.592781984692 0.0100059 2061-Jul-28 17:31 0.592781988902 0.0109846 2061-Jul-28 17:32 0.592781993504 0.0119634 2061-Jul-28 17:33 0.592781998499 0.0129421 2061-Jul-28 17:34 0.592782003886 0.0139209 2061-Jul-28 17:35 0.592782009665 0.0148996 2061-Jul-28 17:36 0.592782015838 0.0158784 2061-Jul-28 17:37 0.592782022403 0.0168571 2061-Jul-28 17:38 0.592782029360 0.0178359 2061-Jul-28 17:39 0.592782036710 0.0188146 2061-Jul-28 17:40 0.592782044452 0.0197934 2061-Jul-28 17:41 0.592782052588 0.0207721 2061-Jul-28 17:42 0.592782061115 0.0217509 2061-Jul-28 17:43 0.592782070035 0.0227296 2061-Jul-28 17:44 0.592782079348 0.0237084 2061-Jul-28 17:45 0.592782089054 0.0246871 2061-Jul-28 17:46 0.592782099151 0.0256659 2061-Jul-28 17:47 0.592782109642 0.0266446 2061-Jul-28 17:48 0.592782120525 0.0276233 2061-Jul-28 17:49 0.592782131800 0.0286021 2061-Jul-28 17:50 0.592782143469 0.0295808 2061-Jul-28 17:51 0.592782155529 0.0305596 2061-Jul-28 17:52 0.592782167982 0.0315383 2061-Jul-28 17:53 0.592782180828 0.0325171 2061-Jul-28 17:54 0.592782194067 0.0334958 2061-Jul-28 17:55 0.592782207698 0.0344746 2061-Jul-28 17:56 0.592782221721 0.0354533 2061-Jul-28 17:57 0.592782236137 0.0364321 2061-Jul-28 17:58 0.592782250946 0.0374108 2061-Jul-28 17:59 0.592782266147 0.0383896 2061-Jul-28 18:00 0.592782281741 0.0393683 $$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'