Ephemeris Generator Ephemeris Settings Target Body: Comet 2P/Encke [1994] Observer Location: Geocentric [Code=500] From: A.D. 1993-12-27 00:00 UT To: A.D. 1994-01-06 00:00 Step: 12 hour 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 15:14:30 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. 1993-Dec-27 00:00:00.0000 UT Stop time : A.D. 1994-Jan-06 00:00:00.0000 UT Step-size : 720 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= 2449400.5 != 1994-Feb-17.0000000 (TDB) EC= .850211106 QR= .330917108 TP= 2449392.9785287 OM= 334.7280061 W= 186.2716142 IN= 11.9401475 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 ************************************************************************************************************************************************* 1993-Dec-27 00:00 22 29 13.86 +03 49 20.2 -0.90 -13.77 9.63 16.21 1.0386095491 -28.34278 0.9258759500 -6.37523 65.8321 59.7498 1993-Dec-27 12:00 22 29 13.20 +03 46 35.0 -0.74 -13.75 9.63 16.20 1.0304110989 -28.44050 0.9240019836 -6.60252 65.3132 60.1252 1993-Dec-28 00:00 22 29 12.66 +03 43 50.1 -0.62 -13.73 9.62 16.19 1.0221843676 -28.53865 0.9220620006 -6.83239 64.7947 60.5061 1993-Dec-28 12:00 22 29 12.20 +03 41 05.2 -0.51 -13.74 9.62 16.18 1.0139292363 -28.63720 0.9200552616 -7.06480 64.2765 60.8926 1993-Dec-29 00:00 22 29 11.82 +03 38 20.2 -0.44 -13.76 9.61 16.16 1.0056455919 -28.73613 0.9179810377 -7.29972 63.7585 61.2851 1993-Dec-29 12:00 22 29 11.50 +03 35 34.9 -0.38 -13.79 9.61 16.15 0.9973333265 -28.83543 0.9158386098 -7.53710 63.2406 61.6837 1993-Dec-30 00:00 22 29 11.20 +03 32 49.1 -0.36 -13.84 9.60 16.14 0.9889923384 -28.93507 0.9136272686 -7.77693 62.7227 62.0889 1993-Dec-30 12:00 22 29 10.91 +03 30 02.5 -0.36 -13.91 9.60 16.13 0.9806225327 -29.03502 0.9113463150 -8.01916 62.2046 62.5008 1993-Dec-31 00:00 22 29 10.61 +03 27 15.0 -0.39 -14.00 9.59 16.12 0.9722238219 -29.13527 0.9089950598 -8.26376 61.6863 62.9198 1993-Dec-31 12:00 22 29 10.27 +03 24 26.3 -0.45 -14.11 9.59 16.11 0.9637961268 -29.23577 0.9065728244 -8.51068 61.1677 63.3462 1994-Jan-01 00:00 22 29 09.87 +03 21 36.2 -0.54 -14.23 9.58 16.10 0.9553393765 -29.33650 0.9040789400 -8.75991 60.6486 63.7804 1994-Jan-01 12:00 22 29 09.39 +03 18 44.4 -0.66 -14.38 9.57 16.08 0.9468535107 -29.43743 0.9015127499 -9.01139 60.1289 64.2226 1994-Jan-02 00:00 22 29 08.79 +03 15 50.8 -0.82 -14.55 9.57 16.07 0.9383384788 -29.53851 0.8988736080 -9.26508 59.6085 64.6733 1994-Jan-02 12:00 22 29 08.06 +03 12 54.9 -1.01 -14.74 9.56 16.06 0.9297942424 -29.63971 0.8961608824 -9.52094 59.0873 65.1328 1994-Jan-03 00:00 22 29 07.16 +03 09 56.7 -1.23 -14.96 9.56 16.05 0.9212207752 -29.74097 0.8933739540 -9.77891 58.5651 65.6015 1994-Jan-03 12:00 22 29 06.06 +03 06 55.7 -1.49 -15.20 9.55 16.03 0.9126180653 -29.84225 0.8905122204 -10.03894 58.0417 66.0797 1994-Jan-04 00:00 22 29 04.74 +03 03 51.6 -1.79 -15.47 9.54 16.02 0.9039861149 -29.94350 0.8875750956 -10.30097 57.5171 66.5681 1994-Jan-04 12:00 22 29 03.16 +03 00 44.2 -2.14 -15.76 9.53 16.01 0.8953249434 -30.04465 0.8845620145 -10.56491 56.9910 67.0669 1994-Jan-05 00:00 22 29 01.30 +02 57 33.1 -2.52 -16.08 9.53 15.99 0.8866345873 -30.14564 0.8814724333 -10.83069 56.4633 67.5766 1994-Jan-05 12:00 22 28 59.10 +02 54 17.9 -2.95 -16.44 9.52 15.98 0.8779151027 -30.24641 0.8783058343 -11.09822 55.9338 68.0977 1994-Jan-06 00:00 22 28 56.55 +02 50 58.3 -3.42 -16.82 9.51 15.96 0.8691665665 -30.34687 0.8750617276 -11.36739 55.4024 68.6308 ************************************************************************************************************************************************* 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 ************************************************************************************************************************************************* ------------------------------------------------------------------------ [JPL/SSD Home] Credits/Awards Contact: Webmaster (webmaster@ssd.jpl.nasa.gov) Last modified: 1999 June 30 13:42