Ephemeris Generator Ephemeris Settings Target Body: Comet 29P/Schwassmann-Wachmann 1 = (1989 XV) [1989.83] Observer Location: Geocentric [Code=500] From: A.D. 1991-08-10 07:34 UT To: A.D. 1991-08-10 07:44 Step: 1 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 09:31:42 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Schwassmann-Wachmann 1 {source: JPL#21-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1991-Aug-10 07:34:00.0000 UT Stop time : A.D. 1991-Aug-10 07:44:00.0000 UT Step-size : 1 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 : 15.0 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= 2447840.5 != 1989-Nov-10.0000000 (TDB) EC= .044659867 QR= 5.771772566 TP= 2447826.2221546 OM= 312.8479555 W= 49.8700394 IN= 9.372139000000001 Comet physical & dynamic parameters: GM= n.a. RAD= 15. A1= n.a. A2= n.a. M1= 4. M2= 9. k1= 7.5 k2= 8. PHCOF= n.a. ************************************************************************************************************************************************* 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 ************************************************************************************************************************************************* 1991-Aug-10 07:34 03 40 26.26 +28 55 35.7 13.97 6.70 13.64 19.02 5.8497293260 0.38626 5.9789953936 -25.91410 77.8198 9.7539 1991-Aug-10 07:35 03 40 26.27 +28 55 35.8 13.97 6.70 13.64 19.02 5.8497294811 0.38626 5.9789850004 -25.91416 77.8204 9.7540 1991-Aug-10 07:36 03 40 26.29 +28 55 36.0 13.97 6.70 13.64 19.02 5.8497296363 0.38626 5.9789746071 -25.91422 77.8210 9.7540 1991-Aug-10 07:37 03 40 26.31 +28 55 36.1 13.97 6.70 13.64 19.02 5.8497297914 0.38627 5.9789642138 -25.91428 77.8216 9.7540 1991-Aug-10 07:38 03 40 26.33 +28 55 36.2 13.97 6.69 13.64 19.02 5.8497299466 0.38627 5.9789538204 -25.91434 77.8221 9.7540 1991-Aug-10 07:39 03 40 26.35 +28 55 36.3 13.97 6.69 13.64 19.02 5.8497301017 0.38627 5.9789434271 -25.91440 77.8227 9.7540 1991-Aug-10 07:40 03 40 26.36 +28 55 36.4 13.97 6.69 13.64 19.02 5.8497302569 0.38627 5.9789330337 -25.91446 77.8233 9.7541 1991-Aug-10 07:41 03 40 26.38 +28 55 36.5 13.97 6.69 13.64 19.02 5.8497304120 0.38627 5.9789226403 -25.91452 77.8239 9.7541 1991-Aug-10 07:42 03 40 26.40 +28 55 36.6 13.97 6.69 13.64 19.02 5.8497305672 0.38627 5.9789122469 -25.91458 77.8245 9.7541 1991-Aug-10 07:43 03 40 26.42 +28 55 36.7 13.97 6.69 13.64 19.02 5.8497307223 0.38627 5.9789018534 -25.91464 77.8251 9.7541 1991-Aug-10 07:44 03 40 26.43 +28 55 36.9 13.97 6.69 13.64 19.02 5.8497308774 0.38627 5.9788914600 -25.91470 77.8257 9.7541 ************************************************************************************************************************************************* 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