******************************************************************************* JPL/HORIZONS 12P/Pons-Brooks 2024-May-20 13:25:59 Rec #:90000223 (+COV) Soln.date: 2024-May-14_12:51:15 # obs: 7843 (1953-2024) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2460202.5 ! 2023-Sep-15.0000000 (TDB) RMSW= n.a. EC= .9545604021343332 QR= .780863418843884 TP= 2460421.6315025329 OM= 255.8551012302765 W= 198.9880403452053 IN= 74.1908513997041 A= 17.18464633319056 MA= 356.9682178436606 ADIST= 33.58842924753724 PER= 71.23921089090901 N= .013835446 ANGMOM= .021251693 DAN= 15.67299 DDN= .80218 L= 81.21052330000001 B= -18.243947 MOID= .181381 TP= 2024-Apr-21.1315025329 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.= JPL#K242/63, data arc: 1953-06-20 to 2024-05-01 2: k1=15.0, k2=10.0; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Mon May 20 13:25:59 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 12P/Pons-Brooks {source: JPL#K242/63} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1954-Jun-29 00:00:00.0000 UT Stop time : A.D. 1954-Jun-30 00:00:00.0000 UT Step-size : 60 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.240517.p240810 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-17. PREDICTS-> 2024-AUG-09 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= 2460202.5 ! 2023-Sep-15.0000000 (TDB) RMSW= n.a. EC= .9545604021343332 QR= .780863418843884 TP= 2460421.6315025329 OM= 255.8551012302765 W= 198.9880403452053 IN= 74.1908513997041 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 6.282248838029983E-01 Y=-2.169926855266044E+00 Z= 2.384688937518528E+00 VX=-1.323344654172063E-04 VY= 1.207649244975588E-02 VZ=-4.134149846123034E-03 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 **************************************************************** $$SOE 1954-Jun-29 00:00 1.62680049332891 -0.2104525 37.9606 /T 1954-Jun-29 01:00 1.62679567782164 -0.1897550 37.9893 /T 1954-Jun-29 02:00 1.62679136068497 -0.1690335 38.0180 /T 1954-Jun-29 03:00 1.62678754249364 -0.1482882 38.0466 /T 1954-Jun-29 04:00 1.62678422382128 -0.1275191 38.0752 /T 1954-Jun-29 05:00 1.62678140524052 -0.1067262 38.1038 /T 1954-Jun-29 06:00 1.62677908732293 -0.0859095 38.1324 /T 1954-Jun-29 07:00 1.62677727063900 -0.0650692 38.1610 /T 1954-Jun-29 08:00 1.62677595575815 -0.0442052 38.1896 /T 1954-Jun-29 09:00 1.62677514324879 -0.0233176 38.2181 /T 1954-Jun-29 10:00 1.62677483367822 -0.0024065 38.2467 /T 1954-Jun-29 11:00 1.62677502761271 0.0185281 38.2752 /T 1954-Jun-29 12:00 1.62677572561747 0.0394862 38.3037 /T 1954-Jun-29 13:00 1.62677692825660 0.0604677 38.3322 /T 1954-Jun-29 14:00 1.62677863609318 0.0814727 38.3606 /T 1954-Jun-29 15:00 1.62678084968922 0.1025009 38.3891 /T 1954-Jun-29 16:00 1.62678356960564 0.1235524 38.4175 /T 1954-Jun-29 17:00 1.62678679640228 0.1446272 38.4460 /T 1954-Jun-29 18:00 1.62679053063797 0.1657252 38.4744 /T 1954-Jun-29 19:00 1.62679477287038 0.1868463 38.5028 /T 1954-Jun-29 20:00 1.62679952365618 0.2079905 38.5311 /T 1954-Jun-29 21:00 1.62680478355091 0.2291578 38.5595 /T 1954-Jun-29 22:00 1.62681055310907 0.2503481 38.5878 /T 1954-Jun-29 23:00 1.62681683288404 0.2715614 38.6162 /T 1954-Jun-30 00:00 1.62682362342817 0.2927977 38.6445 /T $$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 = '90000223' QUANTITIES = '20,23' START_TIME = '1954-Jun-29' STEP_SIZE = '1 hours' STOP_TIME = '1954-Jun-30'