******************************************************************************* JPL/HORIZONS Kohoutek (C/1973 E1) 2024-Apr-24 17:25:21 Rec #:90002022 (+COV) Soln.date: 2021-Apr-15_23:29:22 # obs: 812 (1973-1974) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2442022.5 ! 1973-Dec-06.0000000 (TDB) RMSW= n.a. EC= 1.000007809885518 QR= .1424250322974156 TP= 2442044.9306834741 OM= 258.4894909953879 W= 37.79756893411028 IN= 14.3041449344601 A= -18236.50704838456 MA= -8.9770592705456E-6 ADIST= 9.999999E99 PER= 9.999999E99 N= 4.E-7 ANGMOM= .00918101 DAN= .15912 DDN= 1.35764 L= 295.4167673 B= 8.709349400000001 MOID= .029043 TP= 1973-Dec-28.4306834741 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 5.8 M2= 9.5 k1= 9. k2= 5. PHCOF= .030 COMET comments 1: soln ref.= JPL#2, data arc: 1973-01-28 to 1974-04-26 2: k1=9., k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed Apr 24 17:25:22 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Kohoutek (C/1973 E1) {source: JPL#2} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2022-Jan-01 00:00:00.0000 UT Stop time : A.D. 2030-Jan-01 00:00:00.0000 UT Step-size : 1 calendar year ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -6378.137 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : ITRF93 {East-longitude positive} Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441} Rel. light bend : Sun {source: DE441} Rel. lght bnd GM: 1.3271E+11 km^3/s^2 Small-body perts: Yes {source: SB441-N16} Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Calendar mode : Mixed Julian/Gregorian EOP file : eop.240424.p240718 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-24. PREDICTS-> 2024-JUL-17 Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO ) Table cut-offs 2: Solar elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO ) Table cut-offs 3: RA/DEC angular rate ( 0.0=NO ) ******************************************************************************* Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2442022.5 ! 1973-Dec-06.0000000 (TDB) RMSW= n.a. EC= 1.000007809885518 QR= .1424250322974156 TP= 2442044.9306834741 OM= 258.4894909953879 W= 37.79756893411028 IN= 14.3041449344601 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-7.176607165692492E-01 Y= 2.189317234802677E-01 Z=-1.092419637587899E-01 VX= 2.124785674986996E-02 VY=-1.810625626616084E-02 VZ=-1.117975478505453E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 5.8 M2= 9.5 k1= 9. k2= 5. PHCOF= .030 ******************************************************************************************************** Date__(UT)__HR:MN r rdot VmagSn VmagOb Cnst RNG_3sigma RNGRT_3sig ******************************************************************************************************** $$SOE 2022-Jan-01 00:00 73.83948473087 4.8620712 4.8664073 29.6284021 Gem 1203588.05 0.0010657 2023-Jan-01 00:00 74.86126066496 4.8317857 4.8362993 29.5865291 Gem 1237169.15 0.0010731 2024-Jan-01 00:00 75.87632591102 4.7981810 4.8029261 29.5535245 Gem 1270976.97 0.0010804 2025-Jan-01 00:00 76.88677822056 4.7620449 4.7669567 29.6311834 Gem 1305156.58 0.0010876 2026-Jan-01 00:00 77.88668184436 4.7247301 4.7296665 29.5852674 Gem 1339411.75 0.0010946 2027-Jan-01 00:00 78.87880769585 4.6883506 4.6931795 29.5771614 Gem 1373888.62 0.0011016 2028-Jan-01 00:00 79.86347979175 4.6543728 4.6589693 29.5696893 Gem 1408586.98 0.0011085 2029-Jan-01 00:00 80.84394582007 4.6230629 4.6273715 29.6132577 Gem 1443656.91 0.0011154 2030-Jan-01 00:00 81.81552854203 4.5954501 4.5994687 29.6197361 Gem 1478793.94 0.0011221 $$EOE ******************************************************************************************************** Column meaning: TIME Times PRIOR to 1962 are UT1, a mean-solar time closely related to the prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1 using integer leap-seconds for 1972 and later years. Conversion from the internal Barycentric Dynamical Time (TDB) of solar system dynamics to the non-uniform civil UT time-scale requested for output has not been determined for UTC times after the next July or January 1st. Therefore, the last known leap-second is used as a constant over future intervals. Time tags refer to the UT time-scale conversion from TDB on Earth regardless of observer location within the solar system, although clock rates may differ due to the local gravity field and no analog to "UT" may be defined for that location. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. 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. NOTE: "n.a." in output means quantity "not available" at the print-time. STATISTICAL UNCERTAINTIES Output includes formal +/- 3 standard-deviation statistical orbit uncertainty quantities. There is a 99.7% (1-D) or 98.9% (2-D) chance the actual value is within given bounds. These statistical calculations assume observational data errors are random. If there are systematic biases (such as timing, reduction or star-catalog errors), results can be optimistic. Because the epoch covariance is mapped using linearized variational partial derivatives, results can also be optimistic for times far from the solution epoch, particularly for objects having close planetary encounters. 'r rdot' = The Sun's apparent range ("r", light-time aberrated) and range-rate ("rdot") relative to the target center, as seen by the observer. A positive "rdot" means the target center was moving away from the Sun, negative means moving toward the Sun. Units: AU and KM/S 'VmagSn VmagOb' = Magnitude of target centers' velocity with respect to the Sun ("VmagSn") and the observer ("VmagOb") at the time light left the target center to be observed (print time minus down-leg light-time). These are absolute values of the velocity vectors (total speeds) and do NOT indicate direction of motion. Units: KM/S 'Cnst' = Constellation ID; the 3-letter abbreviation for the name of the constellation containing the target centers' astrometric position, as defined by IAU (1930) boundary delineation. See documentation for list of abbreviations. 'RNG_3sigma RNGRT_3sig' = Range and range rate (radial velocity) formal 3-standard-deviation uncertainties. Units: KM, KM/S 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 = '1973 E1' START_TIME = '2022-01-01' STOP_TIME = '2030-01-01' STEP_SIZE = '1 year' QUANTITIES = '19,22,29,39'