******************************************************************************* JPL/HORIZONS 78P/Gehrels 2 2024-May-03 22:14:16 Rec #:90000843 (+COV) Soln.date: 2021-Jul-27_08:55:56 # obs: 5573 (2011-2021) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2456987.5 ! 2014-Nov-26.0000000 (TDB) RMSW= n.a. EC= .461637372748463 QR= 2.011536547242388 TP= 2455938.6049367008 OM= 210.5626757533421 W= 192.7558599464267 IN= 6.252696505134401 A= 3.73639707776845 MA= 143.1385388526531 ADIST= 5.461257608294511 PER= 7.2225031160125 N= .136466024 ANGMOM= .029496143 DAN= 5.34808 DDN= 2.02734 L= 43.2451152 B= -1.377972 MOID= 1.02019 TP= 2012-Jan-12.1049367008 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 9. M2= 12.6 k1= 13.25 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= -1.500123590231E-9 A2= 3.59766036272E-10 A3= 0. Non-standard or simulated/proxy model: ALN= .04083733261 NK= 2.6 NM= 2. NN= 3. R0= 5. COMET comments 1: soln ref.= JPL#K192/24, data arc: 2011-05-03 to 2021-04-14 2: k1=13.25, k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Fri May 3 22:14:16 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 78P/Gehrels 2 {source: JPL#K192/24} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2023-Sep-27 00:00:00.0000 UT Stop time : A.D. 2023-Oct-02 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* 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.240503.p240727 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-03. PREDICTS-> 2024-JUL-26 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= 2456987.5 ! 2014-Nov-26.0000000 (TDB) RMSW= n.a. EC= .461637372748463 QR= 2.011536547242388 TP= 2455938.6049367008 OM= 210.5626757533421 W= 192.7558599464267 IN= 6.252696505134401 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-4.686381750110717E+00 Y=-2.246663949467398E+00 Z=-1.005529075678697E+00 VX= 1.468081509459746E-03 VY=-5.271284315177755E-03 VZ=-1.632161795322880E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 9. M2= 12.6 k1= 13.25 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= -1.500123590231E-9 A2= 3.59766036272E-10 A3= 0. Non-standard or simulated/proxy model: ALN= .04083733261 NK= 2.6 NM= 2. NN= 3. R0= 5. ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2023-Sep-27 00:00 5.234503480671 -2.5470350 2023-Sep-27 03:00 5.234319575453 -2.5480599 2023-Sep-27 06:00 5.234135596233 -2.5490847 2023-Sep-27 09:00 5.233951543010 -2.5501096 2023-Sep-27 12:00 5.233767415782 -2.5511344 2023-Sep-27 15:00 5.233583214546 -2.5521594 2023-Sep-27 18:00 5.233398939302 -2.5531843 2023-Sep-27 21:00 5.233214590045 -2.5542093 2023-Sep-28 00:00 5.233030166776 -2.5552343 2023-Sep-28 03:00 5.232845669491 -2.5562593 2023-Sep-28 06:00 5.232661098189 -2.5572843 2023-Sep-28 09:00 5.232476452868 -2.5583094 2023-Sep-28 12:00 5.232291733525 -2.5593345 2023-Sep-28 15:00 5.232106940159 -2.5603597 2023-Sep-28 18:00 5.231922072768 -2.5613848 2023-Sep-28 21:00 5.231737131350 -2.5624100 2023-Sep-29 00:00 5.231552115903 -2.5634352 2023-Sep-29 03:00 5.231367026424 -2.5644605 2023-Sep-29 06:00 5.231181862912 -2.5654857 2023-Sep-29 09:00 5.230996625365 -2.5665110 2023-Sep-29 12:00 5.230811313781 -2.5675363 2023-Sep-29 15:00 5.230625928157 -2.5685617 2023-Sep-29 18:00 5.230440468492 -2.5695871 2023-Sep-29 21:00 5.230254934784 -2.5706125 2023-Sep-30 00:00 5.230069327031 -2.5716379 2023-Sep-30 03:00 5.229883645230 -2.5726633 2023-Sep-30 06:00 5.229697889380 -2.5736888 2023-Sep-30 09:00 5.229512059479 -2.5747143 2023-Sep-30 12:00 5.229326155525 -2.5757399 2023-Sep-30 15:00 5.229140177515 -2.5767654 2023-Sep-30 18:00 5.228954125448 -2.5777910 2023-Sep-30 21:00 5.228767999321 -2.5788167 2023-Oct-01 00:00 5.228581799133 -2.5798423 2023-Oct-01 03:00 5.228395524882 -2.5808680 2023-Oct-01 06:00 5.228209176565 -2.5818937 2023-Oct-01 09:00 5.228022754181 -2.5829194 2023-Oct-01 12:00 5.227836257727 -2.5839452 2023-Oct-01 15:00 5.227649687201 -2.5849709 2023-Oct-01 18:00 5.227463042603 -2.5859968 2023-Oct-01 21:00 5.227276323928 -2.5870226 2023-Oct-02 00:00 5.227089531176 -2.5880485 $$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 ******************************************************************************* !$$SOF COMMAND = '90000843' START_TIME = '2023-Sep-27' STOP_TIME = '2023-Oct-02' STEP_SIZE = '3 hours' QUANTITIES = '19'