******************************************************************************* JPL/HORIZONS Lovejoy (C/2007 E2) 2024-May-11 00:18:15 Rec #:90003752 (+COV) Soln.date: 2021-Apr-15_23:31:05 # obs: 1648 (158 days) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2454235.5 ! 2007-May-15.0000000 (TDB) RMSW= n.a. EC= .9991756528860144 QR= 1.092938235617152 TP= 2454187.0010642014 OM= 232.4318366430011 W= 340.5337773673682 IN= 95.88290133343503 A= 1325.822844618149 MA= .0009901660606235155ADIST= 2650.55275100068 PER= 48276.574747999 N= 2.0416E-5 ANGMOM= .025427562 DAN= 1.12508 DDN= 37.71158 L= 234.5066201 B= -19.3596021 MOID= .112833 TP= 2007-Mar-27.5010642014 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 10.3 M2= 16.1 k1= 17.5 k2= 5. PHCOF= .030 COMET comments 1: soln ref.= JPL#49, data arc: 2007-03-18 to 2007-08-23 2: k1=17.5, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat May 11 00:18:16 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Lovejoy (C/2007 E2) {source: JPL#49} Center body name: Solar System Barycenter (0) {source: DE441} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 1950-Jan-01 00:00:00.0000 TDB Stop time : A.D. 2050-Jan-01 00:00:00.0000 TDB Step-size : 100 calendar years ******************************************************************************* 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 : (undefined) Keplerian GM : 2.9630927493968080E-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= 2454235.5 ! 2007-May-15.0000000 (TDB) RMSW= n.a. EC= .9991756528860144 QR= 1.092938235617152 TP= 2454187.0010642014 OM= 232.4318366430011 W= 340.5337773673682 IN= 95.88290133343503 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-7.542134029530858E-01 Y=-1.070440367254035E+00 Z= 3.031230029971979E-01 VX=-3.214747599856772E-04 VY=-5.419351023321610E-03 VZ= 2.026380660246839E-02 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 10.3 M2= 16.1 k1= 17.5 k2= 5. PHCOF= .030 ******************************************************************************* JDTDB EC QR IN OM W Tp N MA TA A AD PR ******************************************************************************* $$SOE 2433282.500000000 = A.D. 1950-Jan-01 00:00:00.0000 TDB EC= 9.988126445683427E-01 QR= 1.091642329464004E+00 IN= 9.587763682873816E+01 OM= 2.323953376457989E+02 W = 3.405869767085315E+02 Tp= 2454187.404047214892 N = 3.537902164802894E-05 MA= 3.592604049471636E+02 TA= 1.929808931739947E+02 A = 9.193896792472016E+02 AD= 1.837687716164939E+03 PR= 1.017552162921545E+07 2469807.500000000 = A.D. 2050-Jan-01 00:00:00.0000 TDB EC= 9.985992505649336E-01 QR= 1.089119544548477E+00 IN= 9.591096674054928E+01 OM= 2.324556248684497E+02 W = 3.404242656481082E+02 Tp= 2454187.336000125390 N = 4.549069917342999E-05 MA= 7.105721815579477E-01 TA= 1.656765247042064E+02 A = 7.775263136172084E+02 AD= 1.553963507689868E+03 PR= 7.913705582486787E+06 $$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 ******************************************************************************* !$$SOF COMMAND = '2007 E2' TABLE_TYPE = 'ELEMENTS' START_TIME = '1950-01-01' STOP_TIME = '2050-01-01' STEP_SIZE = '100 years' CENTER = '@0' OUT_UNITS = 'AU-D'