******************************************************************************* JPL/HORIZONS 17P/Holmes 2024-Apr-30 13:50:58 Rec #:90000285 (+COV) Soln.date: 2023-Oct-10_13:05:23 # obs: 2211 (2011-2023) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457680.5 ! 2016-Oct-19.0000000 (TDB) RMSW= n.a. EC= .4301548244810638 QR= 2.066329254703369 TP= 2456743.2203032067 OM= 326.7738104542646 W= 24.7385060050165 IN= 19.07035853006311 A= 3.62612397801147 MA= 133.7855814370255 ADIST= 5.18591870131957 PER= 6.905135023563 N= .142738162 ANGMOM= .029571458 DAN= 2.12499 DDN= 4.84994 L= 350.3057571 B= 7.8585969 MOID= 1.07304001 TP= 2014-Mar-26.7203032067 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 1.71 M1= 9.4 M2= 13.8 k1= 14.75 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= 2.937110364437E-9 A2= 9.770169109106E-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#K212/34, data arc: 2011-01-04 to 2023-01-22 2: k1=14.75, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Tue Apr 30 13:50:58 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 17P/Holmes {source: JPL#K212/34} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2028-Jan-30 00:00:00.0000 UT Stop time : A.D. 2028-Feb-02 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 1.71 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.240429.p240723 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-29. PREDICTS-> 2024-JUL-22 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= 2457680.5 ! 2016-Oct-19.0000000 (TDB) RMSW= n.a. EC= .4301548244810638 QR= 2.066329254703369 TP= 2456743.2203032067 OM= 326.7738104542646 W= 24.7385060050165 IN= 19.07035853006311 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-4.284211611451038E+00 Y= 2.289135112740716E+00 Z= 8.802806205187234E-01 VX=-4.119721062451906E-03 VY=-3.033632245067547E-03 VZ=-3.479313077887504E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 1.71 M1= 9.4 M2= 13.8 k1= 14.75 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= 2.937110364437E-9 A2= 9.770169109106E-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 ************************************************** $$SOE 2028-Jan-30 00:00 2.092013302315 -0.0834178 2028-Jan-30 03:00 2.092007505353 -0.0771818 2028-Jan-30 06:00 2.092002158579 -0.0709457 2028-Jan-30 09:00 2.091997262000 -0.0647096 2028-Jan-30 12:00 2.091992815622 -0.0584733 2028-Jan-30 15:00 2.091988819449 -0.0522370 2028-Jan-30 18:00 2.091985273487 -0.0460007 2028-Jan-30 21:00 2.091982177739 -0.0397642 2028-Jan-31 00:00 2.091979532210 -0.0335278 2028-Jan-31 03:00 2.091977336902 -0.0272912 2028-Jan-31 06:00 2.091975591819 -0.0210547 2028-Jan-31 09:00 2.091974296962 -0.0148181 2028-Jan-31 12:00 2.091973452332 -0.0085815 2028-Jan-31 15:00 2.091973057932 -0.0023450 2028-Jan-31 18:00 2.091973113762 0.0038917 2028-Jan-31 21:00 2.091973619821 0.0101283 2028-Feb-01 00:00 2.091974576109 0.0163648 2028-Feb-01 03:00 2.091975982625 0.0226014 2028-Feb-01 06:00 2.091977839368 0.0288380 2028-Feb-01 09:00 2.091980146336 0.0350745 2028-Feb-01 12:00 2.091982903525 0.0413109 2028-Feb-01 15:00 2.091986110934 0.0475474 2028-Feb-01 18:00 2.091989768558 0.0537837 2028-Feb-01 21:00 2.091993876394 0.0600201 2028-Feb-02 00:00 2.091998434436 0.0662563 $$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 = '90000285' START_TIME = '2028-Jan-30' STOP_TIME = '2028-Feb-02' STEP_SIZE = '3 hours' QUANTITIES = '19'