******************************************************************************* JPL/HORIZONS 311P/PANSTARRS 2025-Dec-12 18:02:47 Rec #:90001279 (+COV) Soln.date: 2025-May-08_09:42:30 # obs: 272 (2005-2025) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457872.5 ! 2017-Apr-29.0000000 (TDB) RMSW= n.a. EC= .1156675456063671 QR= 1.935565883289373 TP= 2457945.1804861021 OM= 279.259757432331 W= 143.9985657324045 IN= 4.966451478028223 A= 2.188731029459444 MA= 337.8775457917948 ADIST= 2.441896175629515 PER= 3.2381487477005 N= .304379558 ANGMOM= .025278589 DAN= 2.38238 DDN= 1.97467 L= 63.3607502 B= 2.916913 MOID= .94952798 TP= 2017-Jul-10.6804861021 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 19. M2= n.a. k1= 4.5 k2= n.a. PHCOF= n.a. COMET comments 1: soln ref.= JPL#39, data arc: 2005-01-17 to 2025-05-02 2: k1=4.5; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 18:02:47 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: 311P/PANSTARRS {source: JPL#39} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2024-Jan-01 00:00:00.0000 UT Stop time : A.D. 2024-Jan-02 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.251212.p260310 EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-DEC-12. PREDICTS-> 2026-MAR-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= 2457872.5 ! 2017-Apr-29.0000000 (TDB) RMSW= n.a. EC= .1156675456063671 QR= 1.935565883289373 TP= 2457945.1804861021 OM= 279.259757432331 W= 143.9985657324045 IN= 4.966451478028223 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 1.590659902502519E+00 Y= 9.793803018464209E-01 Z= 5.905832651792493E-01 VX=-7.965101125101969E-03 VY= 9.533552142687734E-03 VZ= 3.543511269796854E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 19. M2= n.a. k1= 4.5 k2= n.a. PHCOF= n.a. ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2024-Jan-01 00:00 1.935226447027 -0.0155161 2024-Jan-01 01:00 1.935226081619 -0.0148546 2024-Jan-01 02:00 1.935225732131 -0.0141930 2024-Jan-01 03:00 1.935225398562 -0.0135315 2024-Jan-01 04:00 1.935225080912 -0.0128699 2024-Jan-01 05:00 1.935224779181 -0.0122083 2024-Jan-01 06:00 1.935224493369 -0.0115468 2024-Jan-01 07:00 1.935224223477 -0.0108852 2024-Jan-01 08:00 1.935223969503 -0.0102237 2024-Jan-01 09:00 1.935223731449 -0.0095621 2024-Jan-01 10:00 1.935223509314 -0.0089005 2024-Jan-01 11:00 1.935223303099 -0.0082390 2024-Jan-01 12:00 1.935223112802 -0.0075774 2024-Jan-01 13:00 1.935222938425 -0.0069159 2024-Jan-01 14:00 1.935222779967 -0.0062543 2024-Jan-01 15:00 1.935222637428 -0.0055927 2024-Jan-01 16:00 1.935222510809 -0.0049312 2024-Jan-01 17:00 1.935222400108 -0.0042696 2024-Jan-01 18:00 1.935222305327 -0.0036081 2024-Jan-01 19:00 1.935222226465 -0.0029465 2024-Jan-01 20:00 1.935222163522 -0.0022850 2024-Jan-01 21:00 1.935222116499 -0.0016234 2024-Jan-01 22:00 1.935222085394 -0.0009618 2024-Jan-01 23:00 1.935222070209 -0.0003003 2024-Jan-02 00:00 1.935222070943 0.0003613 $$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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov ******************************************************************************* !$$SOF COMMAND = '311P' QUANTITIES = '19' START_TIME = '2024-Jan-01' STEP_SIZE = '1 hour' STOP_TIME = '2024-Jan-02'