******************************************************************************* JPL/HORIZONS Leonard (C/2021 A1) 2024-Apr-19 19:05:30 Rec #:90004636 (+COV) Soln.date: 2023-Dec-06_01:14:05 # obs: 2424 (2020-2022) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2459406.5 ! 2021-Jul-11.0000000 (TDB) RMSW= n.a. EC= 1.000100480224943 QR= .6152301962242579 TP= 2459582.7926795017 OM= 255.889103218281 W= 225.087712614859 IN= 132.6858129092049 A= -6122.898277484996 MA= -.000362662612789948ADIST= 9.999999E99 PER= 9.999999E99 N= 2.057E-6 ANGMOM= .0190821 DAN= 4.18679 DDN= .7212499999999999 L= 41.6711814 B= -31.3709585 MOID= .231957 TP= 2022-Jan-03.2926795017 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 12.5 M2= n.a. k1= 4.5 k2= n.a. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 5.812188625336E-8 A2= -2.033222913742E-8 A3= 1.10275888443E-8 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#30, data arc: 2020-04-11 to 2022-01-22 2: k1=4.5; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri Apr 19 19:05:30 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Leonard (C/2021 A1) {source: JPL#30} Center body name: Sun (10) {source: DE441} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 2009-May-20 00:00:00.0000 UT Stop time : A.D. 2009-May-31 00:00:00.0000 UT Step-size : 1440 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -695700.0 {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 : IAU_SUN {East-longitude positive} Center radii : 695700.0, 695700.0, 695700.0 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : None 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.240419.p240713 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-19. PREDICTS-> 2024-JUL-12 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 n.a. , 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= 2459406.5 ! 2021-Jul-11.0000000 (TDB) RMSW= n.a. EC= 1.000100480224943 QR= .6152301962242579 TP= 2459582.7926795017 OM= 255.889103218281 W= 225.087712614859 IN= 132.6858129092049 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-1.807972939574268E+00 Y= 1.365332101802608E-02 Z= 2.351056884603704E+00 VX= 9.897579274540939E-03 VY= 5.738055156577133E-03 VZ=-8.288879777427139E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 12.5 M2= n.a. k1= 4.5 k2= n.a. PHCOF= n.a. Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 5.812188625336E-8 A2= -2.033222913742E-8 A3= 1.10275888443E-8 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot RNG_3sigma RNGRT_3sig ************************************************************************* $$SOE 2009-May-20 00:00 29.84624035805 -7.6148998 58816.8278 0.0002022 2009-May-21 00:00 29.84184211504 -7.6154496 58799.7389 0.0002021 2009-May-22 00:00 29.83744355450 -7.6159994 58782.6512 0.0002021 2009-May-23 00:00 29.83304467638 -7.6165492 58765.5648 0.0002021 2009-May-24 00:00 29.82864548066 -7.6170992 58748.4796 0.0002021 2009-May-25 00:00 29.82424596729 -7.6176492 58731.3957 0.0002021 2009-May-26 00:00 29.81984613624 -7.6181992 58714.3130 0.0002021 2009-May-27 00:00 29.81544598748 -7.6187493 58697.2315 0.0002021 2009-May-28 00:00 29.81104552097 -7.6192995 58680.1513 0.0002020 2009-May-29 00:00 29.80664473667 -7.6198497 58663.0723 0.0002020 2009-May-30 00:00 29.80224363456 -7.6204000 58645.9946 0.0002020 2009-May-31 00:00 29.79784221460 -7.6209503 58628.9182 0.0002020 $$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 '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 = '2021 A1' START_TIME = '2009-05-20' STOP_TIME = '2009-05-31' STEP_SIZE = '1 days' QUANTITIES = '19,39' CENTER = '@sun'