******************************************************************************* JPL/HORIZONS 100P/Hartley 1 2024-May-02 18:33:56 Rec #:90000940 (+COV) Soln.date: 2023-Jul-28_19:13:46 # obs: 637 (1985-2022) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457108.5 ! 2015-Mar-27.0000000 (TDB) RMSW= n.a. EC= .4137581328378765 QR= 2.009714538492619 TP= 2457480.5964897643 OM= 37.76542853203424 W= 181.8760610519012 IN= 25.58418133370882 A= 3.428132057884631 MA= 302.2205595300128 ADIST= 4.846549577276644 PER= 6.3473802667214 N= .1552808 ANGMOM= .028995873 DAN= 4.84472 DDN= 2.01003 L= 219.4576579 B= -.8100343 MOID= 1.00283003 TP= 2016-Apr-02.0964897643 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 10. M2= 16.2 k1= 23.25 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= 2.132543474436E-9 A2= -9.565744549036E-11 A3= -6.465473026037E-10 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#39, data arc: 1985-06-13 to 2022-08-15 2: k1=23.25, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Thu May 2 18:33:56 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 100P/Hartley 1 {source: JPL#39} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2028-Dec-15 00:00:00.0000 UT Stop time : A.D. 2028-Dec-17 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined 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.240502.p240726 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-02. PREDICTS-> 2024-JUL-25 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= 2457108.5 ! 2015-Mar-27.0000000 (TDB) RMSW= n.a. EC= .4137581328378765 QR= 2.009714538492619 TP= 2457480.5964897643 OM= 37.76542853203424 W= 181.8760610519012 IN= 25.58418133370882 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.092098780090111E+00 Y= 1.946735959685965E+00 Z= 2.308699160116181E+00 VX=-6.769233377342082E-03 VY=-6.299314607280868E-03 VZ=-3.531392145054694E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 10. M2= 16.2 k1= 23.25 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= 2.132543474436E-9 A2= -9.565744549036E-11 A3= -6.465473026037E-10 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2028-Dec-15 00:00 2.019028086117 -0.0204065 2028-Dec-15 03:00 2.019026846483 -0.0139344 2028-Dec-15 06:00 2.019026074107 -0.0074623 2028-Dec-15 09:00 2.019025768992 -0.0009902 2028-Dec-15 12:00 2.019025931136 0.0054819 2028-Dec-15 15:00 2.019026560539 0.0119540 2028-Dec-15 18:00 2.019027657199 0.0184261 2028-Dec-15 21:00 2.019029221116 0.0248981 2028-Dec-16 00:00 2.019031252286 0.0313701 2028-Dec-16 03:00 2.019033750707 0.0378421 2028-Dec-16 06:00 2.019036716375 0.0443140 2028-Dec-16 09:00 2.019040149287 0.0507858 2028-Dec-16 12:00 2.019044049436 0.0572576 2028-Dec-16 15:00 2.019048416818 0.0637293 2028-Dec-16 18:00 2.019053251427 0.0702009 2028-Dec-16 21:00 2.019058553257 0.0766724 2028-Dec-17 00:00 2.019064322300 0.0831438 $$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 = '100P' START_TIME = '2028-Dec-15' STOP_TIME = '2028-Dec-17' STEP_SIZE = '3 hours' QUANTITIES = '19'