API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 39P/Oterma 2024-May-03 09:08:28 Rec #:90000471 (+COV) Soln.date: 2024-Jan-16_15:22:33 # obs: 287 (1942-2023) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2456994.5 ! 2014-Dec-03.0000000 (TDB) RMSW= n.a. EC= .2284123245383775 QR= 5.712314418622992 TP= 2460043.7839299259 OM= 303.6355887080981 W= 89.7043305431787 IN= 1.478237003763243 A= 7.403325118179799 MA= 210.8024450350957 ADIST= 9.094335817736606 PER= 20.144126272711 N= .048928718 ANGMOM= .045567959 DAN= 7.00882 DDN= 7.02536 L= 33.3398208 B= 1.4782173 MOID= 4.71851015 TP= 2023-Apr-09.2839299259 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 6.8 M2= 13.6 k1= 14.75 k2= 5. PHCOF= .030 COMET comments 1: soln ref.= JPL#24, data arc: 1942-02-17 to 2023-11-10 2: k1=14.75, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Fri May 3 09:08:29 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 39P/Oterma {source: JPL#24} Center body name: Sun (10) {source: DE441} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 2246-Jan-01 00:00:00.0000 TDB Stop time : A.D. 2246-Jan-02 00:00:00.0000 TDB Step-size : 1 calendar months ******************************************************************************* Center geodetic : 0.0, 0.0, 0.0 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)} Center radii : 695700.0, 695700.0, 695700.0 km {Equator_a, b, pole_c} Keplerian GM : 2.9591220828411951E-04 au^3/d^2 Small perturbers: Yes {source: SB441-N16} Output units : AU-D, deg, Julian Day Number (Tp) Calendar mode : Mixed Julian/Gregorian Output type : GEOMETRIC osculating elements Output format : 10 Reference frame : Ecliptic of J2000.0 ******************************************************************************* Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2456994.5 ! 2014-Dec-03.0000000 (TDB) RMSW= n.a. EC= .2284123245383775 QR= 5.712314418622992 TP= 2460043.7839299259 OM= 303.6355887080981 W= 89.7043305431787 IN= 1.478237003763243 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-5.317289091597196E+00 Y=-6.496615807643809E+00 Z=-3.052929370218818E+00 VX= 4.401069487651736E-03 VY=-2.434098768573271E-03 VZ=-9.931961747958078E-04 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 6.8 M2= 13.6 k1= 14.75 k2= 5. PHCOF= .030 ******************************************************************************* JDTDB EC QR IN OM W Tp N MA TA A AD PR ******************************************************************************* $$SOE 2541394.500000000 = A.D. 2246-Jan-01 00:00:00.0000 TDB EC= 2.055806355191544E-01 QR= 6.146433182176446E+00 IN= 1.890549774207829E+00 OM= 2.586178563666865E+02 W = 1.922476444773540E+02 Tp= 2538106.402597155422 N = 4.579774129173664E-02 MA= 1.505874341975070E+02 TA= 1.599891522171599E+02 A = 7.737013291705384E+00 AD= 9.327593401234321E+00 PR= 7.860649670619353E+03 $$EOE ******************************************************************************* TIME Barycentric Dynamical Time ("TDB" or T_eph) output was requested. This continuous coordinate time is equivalent to the relativistic proper time of a clock at rest in a reference frame co-moving with the solar system barycenter but outside the system's gravity well. It is the independent variable in the solar system relativistic equations of motion. TDB runs at a uniform rate of one SI second per second and is independent of irregularities in Earth's rotation. 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. REFERENCE FRAME AND COORDINATES Ecliptic at the standard reference epoch Reference epoch: J2000.0 X-Y plane: adopted Earth orbital plane at the reference epoch Note: IAU76 obliquity of 84381.448 arcseconds wrt ICRF X-Y plane X-axis : ICRF Z-axis : perpendicular to the X-Y plane in the directional (+ or -) sense of Earth's north pole at the reference epoch. Symbol meaning [1 au= 149597870.700 km, 1 day= 86400.0 s]: JDTDB Julian Day Number, Barycentric Dynamical Time EC Eccentricity, e QR Periapsis distance, q (au) IN Inclination w.r.t X-Y plane, i (degrees) OM Longitude of Ascending Node, OMEGA, (degrees) W Argument of Perifocus, w (degrees) Tp Time of periapsis (Julian Day Number) N Mean motion, n (degrees/day) MA Mean anomaly, M (degrees) TA True anomaly, nu (degrees) A Semi-major axis, a (au) AD Apoapsis distance (au) PR Sidereal orbit period (day) ABERRATIONS AND CORRECTIONS Geometric osculating elements have NO corrections or aberrations applied. 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 *******************************************************************************