******************************************************************************* JPL/HORIZONS 61P/Shajn-Schaldach 2024-Apr-18 13:03:09 Rec #:90000666 (+COV) Soln.date: 2024-Mar-20_08:31:05 # obs: 893 (2017-2024) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2459852.5 ! 2022-Sep-30.0000000 (TDB) RMSW= n.a. EC= .4242049819659817 QR= 2.125862145356596 TP= 2459876.315368141 OM= 162.9684985239552 W= 221.6569874035611 IN= 6.000523309570357 A= 3.692046785356171 MA= 356.6912757109495 ADIST= 5.258231425355746 PER= 7.0942909524459 N= .138932318 ANGMOM= .029931966 DAN= 4.4325 DDN= 2.29902 L= 24.469212 B= -3.9842893 MOID= 1.13336003 TP= 2022-Oct-23.8153681410 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 1.2 M1= 11.9 M2= 15.4 k1= 13. 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= -1.847693324089E-8 A2= 1.675747871399E-8 A3= -2.878986299038E-9 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#K222/29, data arc: 2017-01-27 to 2024-02-09 2: k1=13., k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Thu Apr 18 13:03:09 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 61P/Shajn-Schaldach {source: JPL#K222/29} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2023-Dec-24 00:00:00.0000 UT Stop time : A.D. 2023-Dec-27 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 1.2 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.240416.p240711 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-16. PREDICTS-> 2024-JUL-10 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= 2459852.5 ! 2022-Sep-30.0000000 (TDB) RMSW= n.a. EC= .4242049819659817 QR= 2.125862145356596 TP= 2459876.315368141 OM= 162.9684985239552 W= 221.6569874035611 IN= 6.000523309570357 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 2.053162808345279E+00 Y= 5.691122170887480E-01 Z= 1.156081378274978E-01 VX=-4.426154622458170E-03 VY= 1.265494468533424E-02 VZ= 4.181064460381708E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 1.2 M1= 11.9 M2= 15.4 k1= 13. 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= -1.847693324089E-8 A2= 1.675747871399E-8 A3= -2.878986299038E-9 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2023-Dec-24 00:00 3.509622220594 6.8601450 2023-Dec-24 03:00 3.510117477264 6.8594286 2023-Dec-24 06:00 3.510612682137 6.8587117 2023-Dec-24 09:00 3.511107835183 6.8579944 2023-Dec-24 12:00 3.511602936370 6.8572766 2023-Dec-24 15:00 3.512097985668 6.8565585 2023-Dec-24 18:00 3.512592983045 6.8558399 2023-Dec-24 21:00 3.513087928469 6.8551208 2023-Dec-25 00:00 3.513582821911 6.8544014 2023-Dec-25 03:00 3.514077663339 6.8536815 2023-Dec-25 06:00 3.514572452722 6.8529612 2023-Dec-25 09:00 3.515067190029 6.8522404 2023-Dec-25 12:00 3.515561875229 6.8515193 2023-Dec-25 15:00 3.516056508292 6.8507977 2023-Dec-25 18:00 3.516551089186 6.8500757 2023-Dec-25 21:00 3.517045617881 6.8493533 2023-Dec-26 00:00 3.517540094346 6.8486304 2023-Dec-26 03:00 3.518034518551 6.8479071 2023-Dec-26 06:00 3.518528890464 6.8471835 2023-Dec-26 09:00 3.519023210055 6.8464593 2023-Dec-26 12:00 3.519517477294 6.8457348 2023-Dec-26 15:00 3.520011692149 6.8450098 2023-Dec-26 18:00 3.520505854591 6.8442845 2023-Dec-26 21:00 3.520999964589 6.8435587 2023-Dec-27 00:00 3.521494022113 6.8428325 $$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 = '90000666' START_TIME = '2023-Dec-24' STOP_TIME = '2023-Dec-27' STEP_SIZE = '3 hours' QUANTITIES = '19'