Ephemeris Settings Target Body: Comet 2P/Encke [1984] Observer Location: Geocentric [Code=500] From: A.D. 1984-04-24 00:00 UT To: A.D. 1984-05-12 00:00 Step: 1 day 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 Wed Jul 14 14:54:01 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Encke {source: JPL#67-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1984-Apr-24 00:00:00.0000 UT Stop time : A.D. 1984-May-12 00:00:00.0000 UT Step-size : 1440 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 : 3.7 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= 2445800.5 != 1984-Apr-10.0000000 (TDB) EC= .846330015 QR= .34100679 TP= 2445787.1851353 OM= 334.8884271 W= 185.9878526 IN= 11.9326007 Comet physical & dynamic parameters: GM= n.a. RAD= 3.7 A1= -5.4D-11 A2= -1.4D-11 M1= 9.8 M2= 14.5 k1= n.a. 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-Apr-24 00:00 23 34 04.31 -15 04 29.9 -45.69 -33.45 9.18 15.77 0.7389635999 31.27571 0.7518270694 13.17857 47.0269 84.8633 1984-Apr-25 00:00 23 32 51.76 -15 17 19.6 -41.95 -30.77 9.20 15.79 0.7569867621 31.13105 0.7593265959 12.79187 48.3275 83.1442 1984-Apr-26 00:00 23 31 45.01 -15 29 08.8 -38.60 -28.40 9.22 15.81 0.7749231633 30.97583 0.7665968206 12.38518 49.5995 81.5175 1984-Apr-27 00:00 23 30 43.44 -15 40 04.6 -35.62 -26.31 9.24 15.84 0.7927672792 30.81195 0.7736276036 11.96324 50.8460 79.9754 1984-Apr-28 00:00 23 29 46.50 -15 50 13.4 -32.97 -24.48 9.26 15.86 0.8105146006 30.64105 0.7804113194 11.53005 52.0700 78.5109 1984-Apr-29 00:00 23 28 53.65 -15 59 41.1 -30.64 -22.88 9.28 15.88 0.8281614811 30.46449 0.7869424815 11.08902 53.2740 77.1175 1984-Apr-30 00:00 23 28 04.41 -16 08 32.8 -28.59 -21.48 9.30 15.91 0.8457050092 30.28346 0.7932174279 10.64308 54.4604 75.7892 1984-May-01 00:00 23 27 18.32 -16 16 53.3 -26.80 -20.27 9.31 15.93 0.8631428994 30.09894 0.7992340558 10.19471 55.6314 74.5209 1984-May-02 00:00 23 26 34.99 -16 24 46.7 -25.25 -19.23 9.33 15.95 0.8804733993 29.91180 0.8049915962 9.74605 56.7891 73.3074 1984-May-03 00:00 23 25 54.02 -16 32 16.9 -23.93 -18.34 9.34 15.97 0.8976952118 29.72277 0.8104904215 9.29893 57.9352 72.1443 1984-May-04 00:00 23 25 15.06 -16 39 27.5 -22.81 -17.58 9.36 16.00 0.9148074265 29.53245 0.8157318774 8.85489 59.0713 71.0276 1984-May-05 00:00 23 24 37.79 -16 46 21.4 -21.88 -16.95 9.37 16.02 0.9318094642 29.34138 0.8207181368 8.41527 60.1991 69.9533 1984-May-06 00:00 23 24 01.91 -16 53 01.5 -21.12 -16.44 9.38 16.04 0.9487010269 29.15001 0.8254520700 7.98114 61.3199 68.9181 1984-May-07 00:00 23 23 27.14 -16 59 30.5 -20.53 -16.02 9.40 16.06 0.9654820563 28.95873 0.8299371295 7.55345 62.4350 67.9187 1984-May-08 00:00 23 22 53.22 -17 05 50.6 -20.08 -15.69 9.41 16.08 0.9821526982 28.76785 0.8341772475 7.13292 63.5455 66.9522 1984-May-09 00:00 23 22 19.90 -17 12 04.0 -19.77 -15.45 9.42 16.09 0.9987132711 28.57765 0.8381767445 6.72017 64.6527 66.0158 1984-May-10 00:00 23 21 46.98 -17 18 12.6 -19.59 -15.29 9.43 16.11 1.0151642401 28.38837 0.8419402490 6.31566 65.7574 65.1071 1984-May-11 00:00 23 21 14.23 -17 24 18.1 -19.53 -15.20 9.44 16.13 1.0315061940 28.20020 0.8454726286 5.91975 66.8607 64.2237 1984-May-12 00:00 23 20 41.47 -17 30 22.2 -19.58 -15.17 9.44 16.15 1.0477398261 28.01332 0.8487789344 5.53272 67.9634 63.3635 ************************************************************************************************************************************************* 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 *************************************************************************************************************************************************