******************************************************************************* JPL/HORIZONS Wirtanen (C/1956 F1-A) 2025-Dec-12 17:40:11 Rec #:90002002 Soln.date: - # obs: 37 (1956-1959) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2436080.5 ! 1957-Aug-30.0000000 (TDB) RMSW= n.a. EC= 1.002745 QR= 4.447262 TP= 2436083.9136999999 OM= 233.6563 W= 13.2594 IN= 33.2017 A= -1620.131876138435 MA= -5.1594555558736E-5 ADIST= 9.999999E99 PER= 9.999999E99 N= 1.5114E-5 ANGMOM= .051338199 DAN= 4.50742 DDN= 371.32215 L= 244.8103979 B= 7.2151083 TP= 1957-Sep-02.4136999999 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: 1956-03-18 to 1959-09-03 2: 2008 SAO Comet Catalog ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Dec 12 17:40:11 2025 Pasadena, USA / Horizons ******************************************************************************* Target body name: Wirtanen (C/1956 F1-A) {source: DASTCOM} Center body name: Solar System Barycenter (0) {source: DE441} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 1800-Jan-01 00:00:00.0000 TDB Stop time : A.D. 2200-Jan-01 00:00:00.0000 TDB Step-size : 400 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= 2436080.5 ! 1957-Aug-30.0000000 (TDB) RMSW= n.a. EC= 1.002745 QR= 4.447262 TP= 2436083.9136999999 OM= 233.6563 W= 13.2594 IN= 33.2017 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.909004595471867E+00 Y=-3.866006676890275E+00 Z=-1.090234214499971E+00 VX= 9.120220361472493E-03 VY=-5.647216441167023E-03 VZ= 4.264585380190321E-03 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 ******************************************************************************* $$SOE 2378496.500000000 = A.D. 1800-Jan-01 00:00:00.0000 TDB EC= 9.999236550373406E-01 QR= 4.436498120896617E+00 IN= 3.320545575932626E+01 OM= 2.337508840227178E+02 W = 1.331562491740065E+01 Tp= 2436083.381703462452 N = 7.040530479801485E-08 MA= 3.599959455780413E+02 TA= 1.991715334851867E+02 A = 5.811120951961085E+04 AD= 1.162179825411008E+05 PR= 5.113251068691496E+09 2524593.500000000 = A.D. 2200-Jan-01 00:00:00.0000 TDB EC= 9.993391459399773E-01 QR= 4.438132651266925E+00 IN= 3.321788923610220E+01 OM= 2.336860324206571E+02 W = 1.311596124417616E+01 Tp= 2436082.910678286571 N = 1.792062619233939E-06 MA= 1.586165185298128E-01 TA= 1.635526167286707E+02 A = 6.715753022860107E+03 AD= 1.342706791306895E+04 PR= 2.008858374345707E+08 $$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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov ******************************************************************************* !$$SOF CENTER = '@0' COMMAND = '1956 F1' OUT_UNITS = 'AU-D' START_TIME = '1800-01-01' STEP_SIZE = '400 years' STOP_TIME = '2200-01-01' TABLE_TYPE = 'ELEMENTS'