API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* JPL/HORIZONS 48P/Johnson 2024-May-22 20:45:24 Rec #:90000567 (+COV) Soln.date: 2024-May-14_12:49:03 # obs: 2169 (1949-2024) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2455283.5 ! 2010-Mar-28.0000000 (TDB) RMSW= n.a. EC= .3678133093808403 QR= 2.302192579374072 TP= 2455833.511076699 OM= 117.2855582581536 W= 207.8437026020389 IN= 13.66056898761638 A= 3.641634051358023 MA= 281.9934523264546 ADIST= 4.981075523341975 PER= 6.9494855176501 N= .14182723 ANGMOM= .030525703 DAN= 4.66673 DDN= 2.37617 L= 324.4557702 B= -6.3329324 MOID= 1.30027997 TP= 2011-Sep-29.0110766990 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 2.87 M1= 9.6 M2= 13.5 k1= 15. k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 5.732255578041E-9 A2= -1.780701614916E-10 A3= -1.073675230145E-9 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#73, data arc: 1949-09-24 to 2024-05-11 2: k1=15., k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Wed May 22 20:45:24 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 48P/Johnson {source: JPL#73} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2025-Mar-01 00:00:00.0000 UT Stop time : A.D. 2025-Mar-05 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 2.87 km 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.240522.p240815 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-22. PREDICTS-> 2024-AUG-14 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= 2455283.5 ! 2010-Mar-28.0000000 (TDB) RMSW= n.a. EC= .3678133093808403 QR= 2.302192579374072 TP= 2455833.511076699 OM= 117.2855582581536 W= 207.8437026020389 IN= 13.66056898761638 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-3.374053204328921E+00 Y=-1.838485060913291E+00 Z= 1.927960520057636E-01 VX= 6.149144066301715E-03 VY=-5.104848370061431E-03 VZ=-2.949652876283343E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= 2.87 M1= 9.6 M2= 13.5 k1= 15. k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 5.732255578041E-9 A2= -1.780701614916E-10 A3= -1.073675230145E-9 Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2025-Mar-01 00:00 2.006629045427 -0.0899781 2025-Mar-01 03:00 2.006622794462 -0.0831926 2025-Mar-01 06:00 2.006617033373 -0.0764070 2025-Mar-01 09:00 2.006611762168 -0.0696213 2025-Mar-01 12:00 2.006606980854 -0.0628356 2025-Mar-01 15:00 2.006602689437 -0.0560497 2025-Mar-01 18:00 2.006598887922 -0.0492638 2025-Mar-01 21:00 2.006595576315 -0.0424778 2025-Mar-02 00:00 2.006592754620 -0.0356917 2025-Mar-02 03:00 2.006590422840 -0.0289056 2025-Mar-02 06:00 2.006588580978 -0.0221195 2025-Mar-02 09:00 2.006587229037 -0.0153334 2025-Mar-02 12:00 2.006586367018 -0.0085472 2025-Mar-02 15:00 2.006585994923 -0.0017610 2025-Mar-02 18:00 2.006586112751 0.0050252 2025-Mar-02 21:00 2.006586720503 0.0118114 2025-Mar-03 00:00 2.006587818178 0.0185975 2025-Mar-03 03:00 2.006589405774 0.0253837 2025-Mar-03 06:00 2.006591483289 0.0321698 2025-Mar-03 09:00 2.006594050720 0.0389558 2025-Mar-03 12:00 2.006597108064 0.0457418 2025-Mar-03 15:00 2.006600655317 0.0525278 2025-Mar-03 18:00 2.006604692474 0.0593137 2025-Mar-03 21:00 2.006609219530 0.0660995 2025-Mar-04 00:00 2.006614236478 0.0728852 2025-Mar-04 03:00 2.006619743313 0.0796708 2025-Mar-04 06:00 2.006625740026 0.0864563 2025-Mar-04 09:00 2.006632226611 0.0932417 2025-Mar-04 12:00 2.006639203058 0.1000270 2025-Mar-04 15:00 2.006646669359 0.1068121 2025-Mar-04 18:00 2.006654625502 0.1135971 2025-Mar-04 21:00 2.006663071479 0.1203819 2025-Mar-05 00:00 2.006672007278 0.1271666 $$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. '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 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 *******************************************************************************