Ephemeris Generator Ephemeris Settings Target Body: Comet 49P/Arend-Rigaux = (1984 XXI) [1984.92] Observer Location: Geocentric [Code=500] From: A.D. 1984-12-30 10:51 UT To: A.D. 1984-12-30 11:43 Step: 5 minute Format: Calendar Date and Time Output Quantities: 2-3,9,19-20,23-24 Ref. Frame, RA/Dec Format: J2000, HMS Apparent Coordinates Model: Airless ------------------------------------------------------------------------------------------------------------------------------------------------- HORIZONS Generated Ephemeris ******************************************************************************* Ephemeris / WWW_USER Sun Jul 25 21:18:33 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Arend-Rigaux {source: JPL#27-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1984-Dec-30 10:51:00.0000 UT Stop time : A.D. 1984-Dec-30 11:43:00.0000 UT Step-size : 5 minutes ******************************************************************************* Center geodetic : 0.000000, 0.000000, 0.00000 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.00000, 0.000, 0.000 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : Standard Earth Model {East-longitude +} Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole} Target pole/equ : No model available Target radii : 4.5 km Target primary : Sun {source: DE-0406LE-0406} Interfering body: MOON (Req= 1737.400) km {source: DE-0406LE-0406} Deflecting body : Sun, EARTH {source: DE-0406LE-0406} Deflecting GMs : 1.3271E+11, 3.9860E+05 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Units conversion: 1 AU= 149597870.691 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs : Elevation (-90deg=NO ), Airmass (>38.0000=NO), Daylight (NO ) ******************************************************************************* Initial heliocentric osc. elements wrt ecliptic and mean equinox of J2000.0: EPOCH= 2446040.5 != 1984-Dec-06.0000000 (TDB) EC= .598741995 QR= 1.446189924 TP= 2446035.9114576 OM= 122.2341866 W= 328.9220093 IN= 17.8404152 Comet physical & dynamic parameters: GM= n.a. RAD= 4.5 A1= 1.72D-10 A2= -5.D-12 M1= 11.3 M2= 15.5 k1= 11. k2= 5. PHCOF= .030 ************************************************************************************************************************************************* Date__(UT)__HR:MN R.A.__(a-apparent)__DEC dRA*cosD d(DEC)/dt T-mag N-mag r rdot delta deldot S-O-T S-T-O ************************************************************************************************************************************************* 1984-Dec-30 10:51 08 59 32.42 +08 19 18.6 25.23 70.15 11.96 15.84 1.4812393828 4.09963 0.5717002167 -3.40556 143.2026 23.4331 1984-Dec-30 10:56 08 59 32.56 +08 19 24.4 25.22 70.15 11.96 15.84 1.4812476109 4.10008 0.5716933883 -3.40457 143.2062 23.4309 1984-Dec-30 11:01 08 59 32.70 +08 19 30.2 25.22 70.16 11.96 15.84 1.4812558399 4.10054 0.5716865620 -3.40357 143.2099 23.4286 1984-Dec-30 11:06 08 59 32.85 +08 19 36.1 25.21 70.16 11.96 15.84 1.4812640698 4.10099 0.5716797376 -3.40258 143.2136 23.4263 1984-Dec-30 11:11 08 59 32.99 +08 19 41.9 25.21 70.16 11.96 15.84 1.4812723006 4.10144 0.5716729152 -3.40159 143.2173 23.4241 1984-Dec-30 11:16 08 59 33.13 +08 19 47.8 25.20 70.17 11.96 15.84 1.4812805324 4.10190 0.5716660949 -3.40059 143.2209 23.4218 1984-Dec-30 11:21 08 59 33.27 +08 19 53.6 25.20 70.17 11.96 15.84 1.4812887650 4.10235 0.5716592765 -3.39960 143.2246 23.4195 1984-Dec-30 11:26 08 59 33.41 +08 19 59.5 25.19 70.18 11.96 15.84 1.4812969986 4.10281 0.5716524601 -3.39861 143.2283 23.4173 1984-Dec-30 11:31 08 59 33.55 +08 20 05.3 25.18 70.18 11.96 15.84 1.4813052331 4.10326 0.5716456457 -3.39761 143.2320 23.4150 1984-Dec-30 11:36 08 59 33.70 +08 20 11.2 25.18 70.19 11.96 15.84 1.4813134685 4.10372 0.5716388333 -3.39662 143.2356 23.4127 1984-Dec-30 11:41 08 59 33.84 +08 20 17.0 25.17 70.19 11.96 15.84 1.4813217048 4.10417 0.5716320229 -3.39563 143.2393 23.4104 ************************************************************************************************************************************************* Column meaning: TIME Prior to 1972, times are UT1. Dates thereafter are UTC. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. Calendar dates prior to 1582-Oct-15 are in the Julian calendar system. Later calendar dates are in the Gregorian system. The TDB uniform time scale is used internally. Conversion between TDB and the selected non-uniform UT output scale has not been determined for UTC times after the next July or January 1st. The last known leap-second is used over any future interval. NOTE: "n.a." in output means quantity "not available" at the print-time. R.A._(a-apparent)__DEC. = Airless apparent right ascension and declination of the target with respect to the Earth true-equator and the meridian containing the Earth true equinox of date. Corrected for light-time, gravitational deflection of light, stellar aberration, precession & nutation. Units:HMS (HH MM SS.ff) and DMS (DD MM SS.f) dRA*cosD d(DEC)/dt = The rate of change of target apparent RA and DEC (airless). d(RA)/dt is multiplied by the cosine of the declination. Units: ARCSECONDS PER HOUR T-mag N-mag = Comet's approximate apparent visual total magnitude ("T-mag") and nuclear magnitude ("N-mag") by following definitions: T-mag = M1 + 5*log10(delta) + k1*log10(r) N-mag = M2 + 5*log10(delta) + k2*log10(r) + phcof*beta Units: none r rdot = Target apparent heliocentric range ("r") and range-rate ("rdot") as seen by observer. Units: AU and KM/S delta deldot = Target apparent range ("delta") and range-rate ("delta-dot") relative to observer. Units: AU and KM/S S-O-T = Sun-Observer-Target angle; target's apparent solar elongation seen from observer location at print-time. If negative, the target center is behind the Sun. Units: DEGREES S-T-O = Sun-Target-Observer angle; target's apparent PHASE ANGLE as seen at observer's location at print time. Units: DEGREES Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA information: http://ssd.jpl.nasa.gov/ connect : telnet ssd.jpl.nasa.gov 6775 e-mail : horizons@ssd.jpl.nasa.gov ************************************************************************************************************************************************* ------------------------------------------------------------------------------------------------------------------------------------------------- Credits/Awards Contact: Webmaster (webmaster@ssd.jpl.nasa.gov) Last modified: 1999 June 30 13:42