******************************************************************************* JPL/HORIZONS 17P/Holmes 2024-Apr-18 17:11:10 Rec #:90000274 Soln.date: - # obs: 46 (1892-1906) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2412280.5 ! 1892-Jul-01.0000000 (TDB) RMSW= n.a. EC= .409522 QR= 2.140564 TP= 2412263.4509000001 OM= 333.2214 W= 14.2809 IN= 20.8053 A= 3.625137600384773 MA= 2.434550503517118 ADIST= 5.109711200769546 PER= 6.9023177146967 N= .142796423 ANGMOM= .029880061 DAN= 2.15996 DDN= 5.0025 L= 346.6056897 B= 5.026569 TP= 1892-Jun-13.9509000001 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 comments 1: soln ref.= SAO/1892 2: k1=14.75, k2=5., phase coef.=0.03;epoch may be 2412281.0 (hour ambiguous: 12h/0h ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Thu Apr 18 17:11:10 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 17P/Holmes {source: SAO/189220} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2028-Apr-15 00:00:00.0000 UT Stop time : A.D. 2028-Apr-30 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.240418.p240712 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-18. PREDICTS-> 2024-JUL-11 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= 2412280.5 ! 1892-Jul-01.0000000 (TDB) RMSW= n.a. EC= .409522 QR= 2.140564 TP= 2412263.4509000001 OM= 333.2214 W= 14.2809 IN= 20.8053 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 2.109908907883534E+00 Y=-3.574638049271317E-01 Z= 1.377022109377130E-01 VX= 1.548319014893577E-03 VY= 1.009731011098928E-02 VZ= 9.487096693148948E-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 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2028-Apr-15 00:00 2.169171125460 3.4771638 2028-Apr-15 03:00 2.169422336983 3.4822717 2028-Apr-15 06:00 2.169673917149 3.4873762 2028-Apr-15 09:00 2.169925865716 3.4924774 2028-Apr-15 12:00 2.170178182443 3.4975752 2028-Apr-15 15:00 2.170430867085 3.5026697 2028-Apr-15 18:00 2.170683919401 3.5077608 2028-Apr-15 21:00 2.170937339148 3.5128485 2028-Apr-16 00:00 2.171191126083 3.5179329 2028-Apr-16 03:00 2.171445279962 3.5230139 2028-Apr-16 06:00 2.171699800541 3.5280915 2028-Apr-16 09:00 2.171954687577 3.5331658 2028-Apr-16 12:00 2.172209940825 3.5382366 2028-Apr-16 15:00 2.172465560043 3.5433041 2028-Apr-16 18:00 2.172721544984 3.5483682 2028-Apr-16 21:00 2.172977895405 3.5534289 2028-Apr-17 00:00 2.173234611061 3.5584862 2028-Apr-17 03:00 2.173491691706 3.5635401 2028-Apr-17 06:00 2.173749137096 3.5685906 2028-Apr-17 09:00 2.174006946985 3.5736377 2028-Apr-17 12:00 2.174265121127 3.5786814 2028-Apr-17 15:00 2.174523659277 3.5837217 2028-Apr-17 18:00 2.174782561188 3.5887586 2028-Apr-17 21:00 2.175041826615 3.5937920 2028-Apr-18 00:00 2.175301455310 3.5988221 2028-Apr-18 03:00 2.175561447028 3.6038487 2028-Apr-18 06:00 2.175821801520 3.6088719 2028-Apr-18 09:00 2.176082518542 3.6138917 2028-Apr-18 12:00 2.176343597844 3.6189081 2028-Apr-18 15:00 2.176605039180 3.6239210 2028-Apr-18 18:00 2.176866842302 3.6289305 2028-Apr-18 21:00 2.177129006963 3.6339366 2028-Apr-19 00:00 2.177391532913 3.6389393 2028-Apr-19 03:00 2.177654419906 3.6439384 2028-Apr-19 06:00 2.177917667692 3.6489342 2028-Apr-19 09:00 2.178181276024 3.6539265 2028-Apr-19 12:00 2.178445244651 3.6589154 2028-Apr-19 15:00 2.178709573326 3.6639008 2028-Apr-19 18:00 2.178974261800 3.6688827 2028-Apr-19 21:00 2.179239309822 3.6738612 2028-Apr-20 00:00 2.179504717143 3.6788363 2028-Apr-20 03:00 2.179770483514 3.6838078 2028-Apr-20 06:00 2.180036608685 3.6887760 2028-Apr-20 09:00 2.180303092405 3.6937406 2028-Apr-20 12:00 2.180569934425 3.6987018 2028-Apr-20 15:00 2.180837134494 3.7036595 2028-Apr-20 18:00 2.181104692361 3.7086138 2028-Apr-20 21:00 2.181372607775 3.7135645 2028-Apr-21 00:00 2.181640880486 3.7185118 2028-Apr-21 03:00 2.181909510242 3.7234556 2028-Apr-21 06:00 2.182178496792 3.7283959 2028-Apr-21 09:00 2.182447839885 3.7333328 2028-Apr-21 12:00 2.182717539268 3.7382661 2028-Apr-21 15:00 2.182987594690 3.7431960 2028-Apr-21 18:00 2.183258005899 3.7481223 2028-Apr-21 21:00 2.183528772642 3.7530452 2028-Apr-22 00:00 2.183799894667 3.7579645 2028-Apr-22 03:00 2.184071371721 3.7628804 2028-Apr-22 06:00 2.184343203552 3.7677928 2028-Apr-22 09:00 2.184615389907 3.7727016 2028-Apr-22 12:00 2.184887930532 3.7776070 2028-Apr-22 15:00 2.185160825175 3.7825088 2028-Apr-22 18:00 2.185434073581 3.7874071 2028-Apr-22 21:00 2.185707675498 3.7923020 2028-Apr-23 00:00 2.185981630670 3.7971933 2028-Apr-23 03:00 2.186255938846 3.8020810 2028-Apr-23 06:00 2.186530599769 3.8069653 2028-Apr-23 09:00 2.186805613186 3.8118460 2028-Apr-23 12:00 2.187080978843 3.8167232 2028-Apr-23 15:00 2.187356696484 3.8215969 2028-Apr-23 18:00 2.187632765855 3.8264670 2028-Apr-23 21:00 2.187909186701 3.8313336 2028-Apr-24 00:00 2.188185958767 3.8361967 2028-Apr-24 03:00 2.188463081797 3.8410562 2028-Apr-24 06:00 2.188740555537 3.8459122 2028-Apr-24 09:00 2.189018379729 3.8507647 2028-Apr-24 12:00 2.189296554119 3.8556136 2028-Apr-24 15:00 2.189575078451 3.8604589 2028-Apr-24 18:00 2.189853952468 3.8653007 2028-Apr-24 21:00 2.190133175914 3.8701390 2028-Apr-25 00:00 2.190412748533 3.8749737 2028-Apr-25 03:00 2.190692670068 3.8798048 2028-Apr-25 06:00 2.190972940262 3.8846324 2028-Apr-25 09:00 2.191253558859 3.8894565 2028-Apr-25 12:00 2.191534525601 3.8942769 2028-Apr-25 15:00 2.191815840231 3.8990938 2028-Apr-25 18:00 2.192097502491 3.9039072 2028-Apr-25 21:00 2.192379512125 3.9087169 2028-Apr-26 00:00 2.192661868874 3.9135231 2028-Apr-26 03:00 2.192944572481 3.9183257 2028-Apr-26 06:00 2.193227622687 3.9231248 2028-Apr-26 09:00 2.193511019235 3.9279203 2028-Apr-26 12:00 2.193794761866 3.9327121 2028-Apr-26 15:00 2.194078850321 3.9375005 2028-Apr-26 18:00 2.194363284343 3.9422852 2028-Apr-26 21:00 2.194648063671 3.9470663 2028-Apr-27 00:00 2.194933188049 3.9518439 2028-Apr-27 03:00 2.195218657215 3.9566178 2028-Apr-27 06:00 2.195504470912 3.9613882 2028-Apr-27 09:00 2.195790628879 3.9661550 2028-Apr-27 12:00 2.196077130857 3.9709181 2028-Apr-27 15:00 2.196363976587 3.9756777 2028-Apr-27 18:00 2.196651165809 3.9804337 2028-Apr-27 21:00 2.196938698263 3.9851861 2028-Apr-28 00:00 2.197226573689 3.9899349 2028-Apr-28 03:00 2.197514791826 3.9946800 2028-Apr-28 06:00 2.197803352415 3.9994216 2028-Apr-28 09:00 2.198092255194 4.0041595 2028-Apr-28 12:00 2.198381499904 4.0088939 2028-Apr-28 15:00 2.198671086283 4.0136246 2028-Apr-28 18:00 2.198961014070 4.0183517 2028-Apr-28 21:00 2.199251283005 4.0230752 2028-Apr-29 00:00 2.199541892826 4.0277951 2028-Apr-29 03:00 2.199832843272 4.0325113 2028-Apr-29 06:00 2.200124134081 4.0372240 2028-Apr-29 09:00 2.200415764992 4.0419330 2028-Apr-29 12:00 2.200707735744 4.0466384 2028-Apr-29 15:00 2.201000046073 4.0513401 2028-Apr-29 18:00 2.201292695719 4.0560382 2028-Apr-29 21:00 2.201585684419 4.0607327 2028-Apr-30 00:00 2.201879011910 4.0654236 $$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 = '90000274' START_TIME = '2028-Apr-15' STOP_TIME = '2028-Apr-30' STEP_SIZE = '3 hours' QUANTITIES = '19'