******************************************************************************* JPL/HORIZONS 12P/Pons-Brooks 2024-May-02 06:36:06 Rec #:90000220 Soln.date: - # obs: 264 (1812-1954) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2383120.5 ! 1812-Aug-30.0000000 (TDB) RMSW= n.a. EC= .955341 QR= .777102 TP= 2383137.3287 OM= 255.6391 W= 199.2871 IN= 73.95650000000001 A= 17.40079267336931 MA= 359.7714921660699 ADIST= 34.02448334673861 PER= 72.587485293741 N= .01357846 ANGMOM= .021204679 DAN= 15.46136 DDN= .79901 L= 81.1631397 B= -18.5080167 TP= 1812-Sep-15.8287000000 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 5. M2= 11. k1= 15. k2= 10. PHCOF= n.a. COMET comments 1: soln ref.= SAO/1812 2: k1=15.0, k2=10.0;epoch may be 2383121.0 (hour ambiguous: 12h/0h); non-gravs. con ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Thu May 2 06:36:06 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 12P/Pons-Brooks {source: SAO/181220} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1812-Sep-18 00:00:00.0000 UT Stop time : A.D. 1812-Sep-24 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.240501.p240725 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-01. PREDICTS-> 2024-JUL-24 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= 2383120.5 ! 1812-Aug-30.0000000 (TDB) RMSW= n.a. EC= .955341 QR= .777102 TP= 2383137.3287 OM= 255.6391 W= 199.2871 IN= 73.95650000000001 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 2.530682982720056E-01 Y= 6.448271585793175E-01 Z= 4.749893973080032E-01 VX=-7.335273524276815E-03 VY= 1.050029136815063E-02 VZ=-2.288131279866969E-02 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 5. M2= 11. k1= 15. k2= 10. PHCOF= n.a. ******************************************************************************* Date__(UT)__HR:MN delta deldot S-O-T /r **************************************************************** $$SOE 1812-Sep-18 00:00 1.22003322509006 -3.9361660 39.4781 /L 1812-Sep-18 03:00 1.21975354267054 -3.8122604 39.4949 /L 1812-Sep-18 06:00 1.21948281817219 -3.6879939 39.5118 /L 1812-Sep-18 09:00 1.21922107745037 -3.5633718 39.5288 /L 1812-Sep-18 12:00 1.21896834596265 -3.4383998 39.5459 /L 1812-Sep-18 15:00 1.21872464876460 -3.3130835 39.5632 /L 1812-Sep-18 18:00 1.21849001050595 -3.1874284 39.5805 /L 1812-Sep-18 21:00 1.21826445542659 -3.0614403 39.5980 /L 1812-Sep-19 00:00 1.21804800735272 -2.9351250 39.6156 /L 1812-Sep-19 03:00 1.21784068969325 -2.8084882 39.6334 /L 1812-Sep-19 06:00 1.21764252543611 -2.6815359 39.6512 /L 1812-Sep-19 09:00 1.21745353714473 -2.5542738 39.6691 /L 1812-Sep-19 12:00 1.21727374695479 -2.4267080 39.6872 /L 1812-Sep-19 15:00 1.21710317657085 -2.2988445 39.7054 /L 1812-Sep-19 18:00 1.21694184726324 -2.1706893 39.7237 /L 1812-Sep-19 21:00 1.21678977986511 -2.0422484 39.7421 /L 1812-Sep-20 00:00 1.21664699476954 -1.9135280 39.7606 /L 1812-Sep-20 03:00 1.21651351192676 -1.7845343 39.7792 /L 1812-Sep-20 06:00 1.21638935084162 -1.6552733 39.7979 /L 1812-Sep-20 09:00 1.21627453057114 -1.5257515 39.8167 /L 1812-Sep-20 12:00 1.21616906972214 -1.3959749 39.8357 /L 1812-Sep-20 15:00 1.21607298644914 -1.2659498 39.8547 /L 1812-Sep-20 18:00 1.21598629845235 -1.1356827 39.8739 /L 1812-Sep-20 21:00 1.21590902297572 -1.0051798 39.8931 /L 1812-Sep-21 00:00 1.21584117680528 -0.8744474 39.9124 /L 1812-Sep-21 03:00 1.21578277626758 -0.7434920 39.9319 /L 1812-Sep-21 06:00 1.21573383722816 -0.6123199 39.9514 /L 1812-Sep-21 09:00 1.21569437509037 -0.4809375 39.9711 /L 1812-Sep-21 12:00 1.21566440479413 -0.3493513 39.9908 /L 1812-Sep-21 15:00 1.21564394081494 -0.2175678 40.0106 /L 1812-Sep-21 18:00 1.21563299716300 -0.0855933 40.0305 /L 1812-Sep-21 21:00 1.21563158738246 0.0465657 40.0506 /L 1812-Sep-22 00:00 1.21563972455078 0.1789027 40.0707 /L 1812-Sep-22 03:00 1.21565742127822 0.3114112 40.0909 /L 1812-Sep-22 06:00 1.21568468970745 0.4440848 40.1111 /L 1812-Sep-22 09:00 1.21572154151328 0.5769169 40.1315 /L 1812-Sep-22 12:00 1.21576798790246 0.7099012 40.1520 /L 1812-Sep-22 15:00 1.21582403961365 0.8430310 40.1725 /L 1812-Sep-22 18:00 1.21588970691739 0.9762999 40.1931 /L 1812-Sep-22 21:00 1.21596499961623 1.1097015 40.2138 /L 1812-Sep-23 00:00 1.21604992704493 1.2432293 40.2346 /L 1812-Sep-23 03:00 1.21614449807073 1.3768767 40.2555 /L 1812-Sep-23 06:00 1.21624872109369 1.5106374 40.2764 /L 1812-Sep-23 09:00 1.21636260404709 1.6445048 40.2974 /L 1812-Sep-23 12:00 1.21648615439793 1.7784725 40.3185 /L 1812-Sep-23 15:00 1.21661937914744 1.9125340 40.3397 /L 1812-Sep-23 18:00 1.21676228483168 2.0466830 40.3609 /L 1812-Sep-23 21:00 1.21691487752215 2.1809129 40.3823 /L 1812-Sep-24 00:00 1.21707716282651 2.3152174 40.4036 /L $$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. 'delta deldot' = Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer. Units: AU and KM/S 'S-O-T /r' = Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers' location at print-time. The '/r' column provides a code indicating the targets' apparent position relative to the Sun in the observers' sky, as described below: Case A: For an observing location on the surface of a rotating body, that body rotational sense is considered: /T indicates target TRAILS Sun (evening sky: rises and sets AFTER Sun) /L indicates target LEADS Sun (morning sky: rises and sets BEFORE Sun) Case B: For an observing point that does not have a rotational model (such as a spacecraft), the "leading" and "trailing" condition is defined by the observers' heliocentric ORBITAL motion: * If continuing in the observers' current direction of heliocentric motion would encounter the targets' apparent longitude first, followed by the Sun's, the target LEADS the Sun as seen by the observer. * If the Sun's apparent longitude would be encountered first, followed by the targets', the target TRAILS the Sun. Two other codes can be output: /* indicates observer is Sun-centered (undefined) /? Target is aligned with Sun center (no lead or trail) The S-O-T solar elongation angle is numerically the minimum separation angle of the Sun and target in the sky in any direction. It does NOT indicate the amount of separation in the leading or trailing directions, which would be defined along the equator of a spherical coordinate system. Units: DEGREES 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 = '90000220' START_TIME = '1812-Sep-18' STOP_TIME = '1812-Sep-24' STEP_SIZE = '3 hours' QUANTITIES = '20,23'