******************************************************************************* JPL/HORIZONS 1P/Halley 2024-Apr-24 12:00:55 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 Wed Apr 24 12:00:55 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. 2134-Mar-24 00:00:00.0000 UT Stop time : A.D. 2134-Mar-30 00:00:00.0000 UT Step-size : 180 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.240423.p240717 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-23. PREDICTS-> 2024-JUL-16 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 2134-Mar-24 00:00 0.599346249538 -5.4108460 2134-Mar-24 03:00 0.598961672501 -5.2418490 2134-Mar-24 06:00 0.598589312914 -5.0724183 2134-Mar-24 09:00 0.598229201645 -4.9025667 2134-Mar-24 12:00 0.597881368629 -4.7323072 2134-Mar-24 15:00 0.597545842861 -4.5616530 2134-Mar-24 18:00 0.597222652381 -4.3906173 2134-Mar-24 21:00 0.596911824267 -4.2192136 2134-Mar-25 00:00 0.596613384626 -4.0474552 2134-Mar-25 03:00 0.596327358582 -3.8753560 2134-Mar-25 06:00 0.596053770268 -3.7029297 2134-Mar-25 09:00 0.595792642819 -3.5301901 2134-Mar-25 12:00 0.595543998362 -3.3571514 2134-Mar-25 15:00 0.595307858006 -3.1838276 2134-Mar-25 18:00 0.595084241839 -3.0102329 2134-Mar-25 21:00 0.594873168917 -2.8363818 2134-Mar-26 00:00 0.594674657259 -2.6622885 2134-Mar-26 03:00 0.594488723839 -2.4879676 2134-Mar-26 06:00 0.594315384579 -2.3134338 2134-Mar-26 09:00 0.594154654345 -2.1387016 2134-Mar-26 12:00 0.594006546943 -1.9637858 2134-Mar-26 15:00 0.593871075110 -1.7887013 2134-Mar-26 18:00 0.593748250509 -1.6134630 2134-Mar-26 21:00 0.593638083730 -1.4380856 2134-Mar-27 00:00 0.593540584281 -1.2625843 2134-Mar-27 03:00 0.593455760586 -1.0869741 2134-Mar-27 06:00 0.593383619983 -0.9112701 2134-Mar-27 09:00 0.593324168718 -0.7354873 2134-Mar-27 12:00 0.593277411948 -0.5596408 2134-Mar-27 15:00 0.593243353734 -0.3837460 2134-Mar-27 18:00 0.593221997041 -0.2078179 2134-Mar-27 21:00 0.593213343739 -0.0318717 2134-Mar-28 00:00 0.593217394598 0.1440773 2134-Mar-28 03:00 0.593234149292 0.3200140 2134-Mar-28 06:00 0.593263606399 0.4959231 2134-Mar-28 09:00 0.593305763396 0.6717895 2134-Mar-28 12:00 0.593360616668 0.8475980 2134-Mar-28 15:00 0.593428161501 1.0233335 2134-Mar-28 18:00 0.593508392093 1.1989808 2134-Mar-28 21:00 0.593601301546 1.3745249 2134-Mar-29 00:00 0.593706881878 1.5499506 2134-Mar-29 03:00 0.593825124020 1.7252431 2134-Mar-29 06:00 0.593956017820 1.9003872 2134-Mar-29 09:00 0.594099552051 2.0753682 2134-Mar-29 12:00 0.594255714409 2.2501712 2134-Mar-29 15:00 0.594424491522 2.4247814 2134-Mar-29 18:00 0.594605868956 2.5991842 2134-Mar-29 21:00 0.594799831214 2.7733648 2134-Mar-30 00:00 0.595006361748 2.9473088 $$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 = '2134-Mar-24' STOP_TIME = '2134-Mar-30' STEP_SIZE = '3 hours' QUANTITIES = '19'