******************************************************************************* JPL/HORIZONS Lexell (D/1770 L1) 2024-May-01 01:24:11 Rec #:90001570 Soln.date: - # obs: 130 (110 days) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2367764.5 ! 1770-Aug-14.0000000 (TDB) RMSW= n.a. EC= .786119 QR= .674449 TP= 2367764.5408999999 OM= 134.4673 W= 225.0161 IN= 1.5517 A= 3.153384358591927 MA= 359.9928011683524 ADIST= 5.632319717183854 PER= 5.599813535009 N= .176010554 ANGMOM= .0188804 DAN= 2.71142 DDN= .77434 L= 359.4728928 B= -1.0974588 TP= 1770-Aug-14.0408999999 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= n.a. M2= n.a. k1= n.a. k2= n.a. PHCOF= n.a. COMET comments 1: soln ref.= SAO_2008, data arc: 1770-06-15 to 1770-10-03 2: epoch may be 2367765.0 (hour ambiguous: 12h/0h); time units are UT, but set to E ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed May 1 01:24:11 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Lexell (D/1770 L1) {source: DASTCOM} Center body name: Sun (10) {source: DE441} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 1779-Jul-01 00:00:00.0000 TDB Stop time : A.D. 1779-Oct-01 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= 2367764.5 ! 1770-Aug-14.0000000 (TDB) RMSW= n.a. EC= .786119 QR= .674449 TP= 2367764.5408999999 OM= 134.4673 W= 225.0161 IN= 1.5517 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 6.742860897958108E-01 Y=-1.612188203750984E-03 Z=-1.475467796807696E-02 VX= 2.738207362281510E-04 VY= 2.589122769318796E-02 VZ= 1.064060335401253E-02 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= n.a. M2= n.a. k1= n.a. k2= n.a. PHCOF= n.a. ******************************************************************************* JDTDB EC QR IN OM W Tp N MA TA A AD PR ******************************************************************************* $$SOE 2371007.500000000 = A.D. 1779-Jul-01 00:00:00.0000 TDB EC= 8.367687037032251E-01 QR= 5.013693951603519E-01 IN= 1.875258671883156E+00 OM= 1.446969378997285E+02 W = 2.147001088155799E+02 Tp= 2371801.304180442356 N = 1.830933151551700E-01 MA= 2.146597610187870E+02 TA= 1.857205053457769E+02 A = 3.071527375784604E+00 AD= 5.641685356408856E+00 PR= 1.966210506893182E+03 2371038.500000000 = A.D. 1779-Aug-01 00:00:00.0000 TDB EC= 1.390855391529519E+00 QR= 5.154481313598554E+00 IN= 2.162206494009857E+01 OM= 1.822426180927369E+02 W = 3.386123350406530E+02 Tp= 2370833.553629211150 N = 2.058025635615942E-02 MA= 4.217848850100411E+00 TA= 2.564890635090870E+01 A =-1.318769403033621E+01 AD= 9.999999999999998E+99 PR= 9.999999999999998E+99 2371069.500000000 = A.D. 1779-Sep-01 00:00:00.0000 TDB EC= 9.736980045119583E-01 QR= 5.203635745545108E+00 IN= 1.740574529016218E+01 OM= 1.809919823182599E+02 W = 3.397037000373859E+02 Tp= 2370809.543867561966 N = 3.541822477456154E-04 MA= 9.207184730217439E-02 TA= 2.904051731079592E+01 A = 1.978418613869406E+02 AD= 3.904800870283361E+02 PR= 1.016425871966805E+06 2371099.500000000 = A.D. 1779-Oct-01 00:00:00.0000 TDB EC= 9.311485505541258E-01 QR= 5.210412584618007E+00 IN= 1.696374595958137E+01 OM= 1.807249580855421E+02 W = 3.398858214281619E+02 Tp= 2370805.602015938610 N = 1.497150755410268E-03 MA= 4.400095888510825E-01 TA= 3.213173269929356E+01 A = 7.567614954444787E+01 AD= 1.461418865042777E+02 PR= 2.404567467231102E+05 $$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 = '1770 L1' TABLE_TYPE = 'ELEMENTS' START_TIME = '1779-Jul-01' STOP_TIME = '1779-Oct-01' STEP_SIZE = '1 month' CENTER = '@Sun' OUT_UNITS = 'AU-D'