******************************************************************************* JPL/HORIZONS 16P/Brooks 2 2024-May-04 19:06:23 Rec #:90000258 Soln.date: - # obs: 161 (1889-1904) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2411280.5 ! 1889-Oct-05.0000000 (TDB) RMSW= n.a. EC= .470801 QR= 1.949832 TP= 2411276.3539999998 OM= 19.4645 W= 343.6632 IN= 6.0812 A= 3.684496758308311 MA= .5777847880599694 ADIST= 5.419161516616623 PER= 7.0725409451379 N= .139359573 ANGMOM= .029131108 DAN= 1.97536 DDN= 5.23126 L= 3.2147676 B= -1.7075819 TP= 1889-Sep-30.8539999998 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 12.2 M2= 15.6 k1= 13.5 k2= 5. PHCOF= .030 COMET comments 1: soln ref.= SAO/1889 2: k1=13.5, k2=5., phase coef.=0.03;epoch may be 2411281.0 (hour ambiguous: 12h/0h) ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat May 4 19:06:23 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 16P/Brooks 2 {source: DASTCOM} Center body name: Sun (10) {source: DE441} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 1865-Jan-01 00:00:00.0000 TDB Stop time : A.D. 1889-Jan-01 00:00:00.0000 TDB Step-size : 24 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 : 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= 2411280.5 ! 1889-Oct-05.0000000 (TDB) RMSW= n.a. EC= .470801 QR= 1.949832 TP= 2411276.3539999998 OM= 19.4645 W= 343.6632 IN= 6.0812 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 1.941963764466894E+00 Y= 1.772924243617257E-01 Z= 2.042231009105674E-02 VX=-1.109972112716103E-03 VY= 1.298822484988672E-02 VZ= 7.296439370391246E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 12.2 M2= 15.6 k1= 13.5 k2= 5. PHCOF= .030 ******************************************************************************* JDTDB EC QR IN OM W Tp N MA TA A AD PR ******************************************************************************* $$SOE 2402237.500000000 = A.D. 1865-Jan-01 00:00:00.0000 TDB EC= 4.473639730541970E-01 QR= 5.474936720606313E+00 IN= 6.577331221673936E+00 OM= 1.882858101475140E+02 W = 2.486884273017119E+00 Tp= 2398753.221118256915 N = 3.160779561486812E-02 MA= 1.101303747593300E+02 TA= 1.477258867378392E+02 A = 9.906948612930803E+00 AD= 1.433896050525529E+01 PR= 1.138959528802629E+04 2411003.500000000 = A.D. 1889-Jan-01 00:00:00.0000 TDB EC= 4.712513887400937E-01 QR= 1.950078405274278E+00 IN= 6.081190584051809E+00 OM= 1.949629776527181E+01 W = 3.435806576000870E+02 Tp= 2411276.203682129271 N = 1.391553230611648E-01 MA= 3.220518310133300E+02 TA= 2.701775890815390E+02 A = 3.688101233263979E+00 AD= 5.426124061253681E+00 PR= 2.587037219135084E+03 $$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 ******************************************************************************* !$$SOF COMMAND = '90000258' TABLE_TYPE = 'ELEMENTS' START_TIME = '1865-01-01' STOP_TIME = '1889-01-01' STEP_SIZE = '24 years' CENTER = '@Sun' OUT_UNITS = 'AU-D'