Ephemeris Generator Ephemeris Settings Target Body: Comet 19P/Borrelly [1981.04] Observer Location: Geocentric [Code=500] From: A.D. 1981-03-06 08:12 UT To: A.D. 1981-03-06 19:14 Step: 1 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 Sun Jul 25 20:46:00 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Borrelly {source: JPL#17-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1981-Mar-06 08:12:00.0000 UT Stop time : A.D. 1981-Mar-06 19:14:00.0000 UT Step-size : 60 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 : 5.2 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= 2444640.5 != 1981-Feb-05.0000000 (TDB) EC= .631482386 QR= 1.319289423 TP= 2444655.5104013 OM= 75.7458874 W= 352.783123 IN= 30.2019226 Comet physical & dynamic parameters: GM= n.a. RAD= 5.2 A1= 1.581E-9 A2= -3.76D-10 M1= 4.5 M2= 13. k1= 25. k2= 10. 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 ************************************************************************************************************************************************* 1981-Mar-06 08:12 02 33 19.86 +17 04 20.4 102.11 86.46 8.63 15.27 1.3302316563 2.62535 1.6061155967 9.62352 55.7351 38.0554 1981-Mar-06 09:12 02 33 26.98 +17 05 46.8 102.13 86.43 8.63 15.27 1.3302950084 2.63281 1.6063473220 9.62983 55.7281 38.0500 1981-Mar-06 10:12 02 33 34.11 +17 07 13.2 102.14 86.40 8.63 15.27 1.3303585399 2.64026 1.6065791990 9.63613 55.7212 38.0447 1981-Mar-06 11:12 02 33 41.23 +17 08 39.6 102.15 86.38 8.63 15.27 1.3304222507 2.64771 1.6068112276 9.64243 55.7143 38.0393 1981-Mar-06 12:12 02 33 48.36 +17 10 06.0 102.17 86.35 8.63 15.27 1.3304861409 2.65516 1.6070434078 9.64872 55.7073 38.0340 1981-Mar-06 13:12 02 33 55.49 +17 11 32.3 102.18 86.32 8.63 15.27 1.3305502103 2.66261 1.6072757395 9.65502 55.7004 38.0286 1981-Mar-06 14:12 02 34 02.62 +17 12 58.6 102.20 86.29 8.63 15.27 1.3306144589 2.67006 1.6075082227 9.66131 55.6935 38.0232 1981-Mar-06 15:12 02 34 09.75 +17 14 24.9 102.21 86.26 8.63 15.27 1.3306788867 2.67751 1.6077408572 9.66760 55.6866 38.0179 1981-Mar-06 16:12 02 34 16.89 +17 15 51.1 102.23 86.23 8.63 15.27 1.3307434937 2.68495 1.6079736432 9.67389 55.6797 38.0125 1981-Mar-06 17:12 02 34 24.03 +17 17 17.3 102.24 86.20 8.63 15.27 1.3308082797 2.69239 1.6082065805 9.68018 55.6728 38.0071 1981-Mar-06 18:12 02 34 31.17 +17 18 43.5 102.26 86.17 8.64 15.27 1.3308732449 2.69983 1.6084396690 9.68646 55.6658 38.0017 1981-Mar-06 19:12 02 34 38.31 +17 20 09.7 102.27 86.14 8.64 15.27 1.3309383890 2.70727 1.6086729087 9.69274 55.6589 37.9963 ************************************************************************************************************************************************* 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