Ephemeris Generator Ephemeris Settings Target Body: Comet 19P/Borrelly = (1987 XXXIII) [1987.92] Observer Location: Geocentric [Code=500] From: A.D. 1987-10-23 20:09 UT To: A.D. 1987-12-18 19:27 Step: 2 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 Sun Jul 25 10:08:59 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. 1987-Oct-23 20:09:00.0000 UT Stop time : A.D. 1987-Dec-18 19:27:00.0000 UT Step-size : 2880 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= 2447160.5 != 1987-Dec-31.0000000 (TDB) EC= .624211536 QR= 1.356795873 TP= 2447147.8232989 OM= 75.43311249999999 W= 353.3365392 IN= 30.3254286 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 ************************************************************************************************************************************************* 1987-Oct-23 20:09 03 34 44.33 -37 52 56.1 -26.50 20.64 8.08 13.95 1.4994105933 -8.25138 0.6876000600 -13.11180 125.0486 32.8990 1987-Oct-25 20:09 03 32 50.43 -37 34 28.1 -29.80 25.61 7.97 13.87 1.4900074105 -8.03379 0.6726023908 -12.85276 125.6242 32.8474 1987-Oct-27 20:09 03 30 43.93 -37 11 52.2 -33.02 30.97 7.85 13.80 1.4808596732 -7.80919 0.6579133796 -12.57713 126.2142 32.7786 1987-Oct-29 20:09 03 28 25.46 -36 44 49.0 -36.12 36.74 7.74 13.72 1.4719754763 -7.57759 0.6435532104 -12.28306 126.8179 32.6925 1987-Oct-31 20:09 03 25 55.78 -36 12 59.7 -39.08 42.90 7.63 13.65 1.4633629147 -7.33898 0.6295444764 -11.96823 127.4338 32.5891 1987-Nov-02 20:09 03 23 15.77 -35 36 05.0 -41.89 49.46 7.52 13.58 1.4550300630 -7.09339 0.6159128049 -11.62971 128.0596 32.4691 1987-Nov-04 20:09 03 20 26.40 -34 53 46.1 -44.52 56.41 7.41 13.51 1.4469849529 -6.84088 0.6026874732 -11.26412 128.6926 32.3335 1987-Nov-06 20:09 03 17 28.73 -34 05 44.3 -46.95 63.75 7.31 13.44 1.4392355506 -6.58150 0.5899018236 -10.86786 129.3291 32.1839 1987-Nov-08 20:09 03 14 23.95 -33 11 41.3 -49.14 71.45 7.21 13.37 1.4317897317 -6.31536 0.5775933260 -10.43744 129.9644 32.0224 1987-Nov-10 20:09 03 11 13.36 -32 11 19.9 -51.06 79.50 7.11 13.30 1.4246552561 -6.04255 0.5658033202 -9.96968 130.5928 31.8518 1987-Nov-12 20:09 03 07 58.35 -31 04 24.6 -52.65 87.85 7.01 13.24 1.4178397413 -5.76322 0.5545766222 -9.46172 131.2074 31.6758 1987-Nov-14 20:09 03 04 40.45 -29 50 42.4 -53.89 96.45 6.92 13.17 1.4113506352 -5.47752 0.5439611232 -8.91110 131.8001 31.4991 1987-Nov-16 20:09 03 01 21.26 -28 30 03.1 -54.73 105.22 6.83 13.12 1.4051951885 -5.18563 0.5340073580 -8.31573 132.3613 31.3272 1987-Nov-18 20:09 02 58 02.44 -27 02 20.7 -55.13 114.07 6.75 13.06 1.3993804260 -4.88777 0.5247679128 -7.67418 132.8803 31.1667 1987-Nov-20 20:09 02 54 45.68 -25 27 33.6 -55.07 122.89 6.67 13.01 1.3939131188 -4.58416 0.5162965410 -6.98592 133.3453 31.0249 1987-Nov-22 20:09 02 51 32.67 -23 45 46.0 -54.51 131.56 6.60 12.96 1.3887997551 -4.27506 0.5086469712 -6.25153 133.7436 30.9100 1987-Nov-24 20:09 02 48 25.05 -21 57 08.2 -53.45 139.95 6.53 12.91 1.3840465125 -3.96075 0.5018716667 -5.47256 134.0621 30.8305 1987-Nov-26 20:09 02 45 24.33 -20 01 57.6 -51.90 147.90 6.47 12.88 1.3796592300 -3.64155 0.4960209309 -4.65113 134.2876 30.7951 1987-Nov-28 20:09 02 42 31.89 -18 00 38.6 -49.89 155.28 6.42 12.84 1.3756433811 -3.31776 0.4911424278 -3.78969 134.4076 30.8120 1987-Nov-30 20:09 02 39 48.95 -15 53 41.9 -47.42 161.95 6.37 12.81 1.3720040474 -2.98975 0.4872807600 -2.89112 134.4108 30.8887 1987-Dec-02 20:09 02 37 16.60 -13 41 44.0 -44.55 167.81 6.33 12.79 1.3687458945 -2.65789 0.4844767933 -1.95905 134.2883 31.0308 1987-Dec-04 20:09 02 34 55.74 -11 25 26.9 -41.30 172.74 6.30 12.77 1.3658731479 -2.32256 0.4827666971 -0.99802 134.0338 31.2422 1987-Dec-06 20:09 02 32 47.19 -09 05 36.9 -37.70 176.66 6.28 12.76 1.3633895721 -1.98417 0.4821807954 -0.01361 133.6444 31.5239 1987-Dec-08 20:09 02 30 51.61 -06 43 03.5 -33.79 179.53 6.27 12.76 1.3612984509 -1.64315 0.4827423779 0.98761 133.1212 31.8743 1987-Dec-10 20:09 02 29 09.60 -04 18 38.5 -29.61 181.31 6.26 12.76 1.3596025700 -1.29993 0.4844666837 1.99832 132.4688 32.2891 1987-Dec-12 20:09 02 27 41.66 -01 53 14.1 -25.21 182.01 6.26 12.77 1.3583042022 -0.95497 0.4873602492 3.01084 131.6955 32.7614 1987-Dec-14 20:09 02 26 28.22 +00 32 18.2 -20.64 181.65 6.28 12.78 1.3574050951 -0.60871 0.4914206781 4.01743 130.8124 33.2822 1987-Dec-16 20:09 02 25 29.63 +02 57 09.3 -15.93 180.31 6.29 12.81 1.3569064621 -0.26164 0.4966367394 5.01055 129.8328 33.8409 ************************************************************************************************************************************************* 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