******************************************************************************* JPL/HORIZONS Lexell (D/1770 L1) 2024-May-01 03:37:43 Rec #:90001570 Soln.date: - # obs: 130 (110 days) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2367764.5 ! 1770-Aug-14.0000000 (TDB) RMSW= n.a. EC= .786119 QR= .674449 TP= 2367764.5408999999 OM= 134.4673 W= 225.0161 IN= 1.5517 A= 3.153384358591927 MA= 359.9928011683524 ADIST= 5.632319717183854 PER= 5.599813535009 N= .176010554 ANGMOM= .0188804 DAN= 2.71142 DDN= .77434 L= 359.4728928 B= -1.0974588 TP= 1770-Aug-14.0408999999 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: 1770-06-15 to 1770-10-03 2: epoch may be 2367765.0 (hour ambiguous: 12h/0h); time units are UT, but set to E ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed May 1 03:37:43 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Lexell (D/1770 L1) {source: SAO_200820} Center body name: Jupiter (599) {source: jup365_merged} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 1779-Jul-27 00:00:00.0000 UT Stop time : A.D. 1779-Jul-28 00:00:00.0000 UT Step-size : 60 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -71492.0 {W-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {W-lon(deg),Dxy(km),Dz(km)} Center pole/equ : IAU_JUPITER {West-longitude positive} Center radii : 71492.0, 71492.0, 66854.0 km {Equator_a, b, pole_c} Target primary : Sun Vis. interferer : IO (R_eq= 1829.400) km {source: jup365_merged} Rel. light bend : Sun {source: jup365_merged} 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.240430.p240724 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-30. PREDICTS-> 2024-JUL-23 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= 2367764.5 ! 1770-Aug-14.0000000 (TDB) RMSW= n.a. EC= .786119 QR= .674449 TP= 2367764.5408999999 OM= 134.4673 W= 225.0161 IN= 1.5517 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X= 6.742860897958108E-01 Y=-1.612188203750984E-03 Z=-1.475467796807696E-02 VX= 2.738207362281510E-04 VY= 2.589122769318796E-02 VZ= 1.064060335401253E-02 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. ******************************************************************************* Date__(UT)__HR:MN delta deldot *************************************************** $$SOE 1779-Jul-27 00:00 0.00752020632785 -15.1051477 1779-Jul-27 01:00 0.00715411087060 -15.3227936 1779-Jul-27 02:00 0.00678260844196 -15.5546459 1779-Jul-27 03:00 0.00640534530377 -15.8016616 1779-Jul-27 04:00 0.00602194717142 -16.0645535 1779-Jul-27 05:00 0.00563202842748 -16.3434801 1779-Jul-27 06:00 0.00523521178007 -16.6374573 1779-Jul-27 07:00 0.00483116788773 -16.9432252 1779-Jul-27 08:00 0.00441969395229 -17.2530106 1779-Jul-27 09:00 0.00400087065825 -17.5499584 1779-Jul-27 10:00 0.00357538264513 -17.7984205 1779-Jul-27 11:00 0.00314519548986 -17.9223632 1779-Jul-27 12:00 0.00271504477024 -17.7553571 1779-Jul-27 13:00 0.00229582594445 -16.9235762 1779-Jul-27 14:00 0.00191222362661 -14.6031308 1779-Jul-27 15:00 0.00161670080456 -9.3289794 1779-Jul-27 16:00 0.00149383146510 -0.4164880 1779-Jul-27 17:00 0.00159849445898 8.7074592 1779-Jul-27 18:00 0.00188304217247 14.2979895 1779-Jul-27 19:00 0.00226175761831 16.8027529 1779-Jul-27 20:00 0.00267919312208 17.7192968 1779-Jul-27 21:00 0.00310895140541 17.9236043 1779-Jul-27 22:00 0.00353935636261 17.8158953 1779-Jul-27 23:00 0.00396532441315 17.5741571 1779-Jul-28 00:00 0.00438473071782 17.2795068 $$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. 'delta deldot' = Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer. 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 = '1770 L1' START_TIME = '1779-Jul-27' STOP_TIME = '1779-July-28' STEP_SIZE = '1 hour' QUANTITIES = '20' CENTER = '@599'