Ephemeris Generator Ephemeris Settings Target Body: Comet 23P/Brorsen-Metcalf = (1989 X) [1989.75] Observer Location: Geocentric [Code=500] From: A.D. 1989-07-27 04:07 UT To: A.D. 1989-08-03 21:53 Step: 6 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 09:22:24 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Brorsen-Metcalf {source: JPL#06-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1989-Jul-27 04:07:00.0000 UT Stop time : A.D. 1989-Aug-03 21:53:00.0000 UT Step-size : 360 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 : (unavailable) 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= 2447800.5 != 1989-Oct-01.0000000 (TDB) EC= .971951327 QR= .478751346 TP= 2447781.4374718 OM= 311.585418 W= 129.6107066 IN= 19.33387 Comet physical & dynamic parameters: GM= n.a. RAD= n.a. A1= 2.561E-9 A2= -5.33D-10 M1= 7.8 M2= 14. k1= 8. 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 ************************************************************************************************************************************************* 1989-Jul-27 04:07 02 25 44.15 +31 04 46.3 273.25 156.00 7.40 15.33 1.1257606408 -29.38320 0.6880775252 -18.47597 80.2152 62.7475 1989-Jul-27 10:07 02 27 52.57 +31 20 21.8 275.90 155.81 7.38 15.32 1.1215169726 -29.39943 0.6854340434 -18.14305 79.9322 63.0710 1989-Jul-27 16:07 02 30 02.59 +31 35 55.9 278.55 155.56 7.36 15.31 1.1172709827 -29.41546 0.6828388959 -17.80652 79.6454 63.3966 1989-Jul-27 22:07 02 32 14.22 +31 51 28.4 281.21 155.25 7.34 15.31 1.1130227007 -29.43127 0.6802926052 -17.46637 79.3550 63.7244 1989-Jul-28 04:07 02 34 27.48 +32 06 58.8 283.88 154.88 7.31 15.30 1.1087721575 -29.44688 0.6777956929 -17.12261 79.0608 64.0543 1989-Jul-28 10:07 02 36 42.38 +32 22 26.9 286.56 154.46 7.29 15.30 1.1045193844 -29.46226 0.6753486793 -16.77525 78.7629 64.3863 1989-Jul-28 16:07 02 38 58.93 +32 37 52.2 289.24 153.97 7.27 15.29 1.1002644141 -29.47741 0.6729520829 -16.42431 78.4613 64.7202 1989-Jul-28 22:07 02 41 17.15 +32 53 14.4 291.92 153.41 7.25 15.28 1.0960072800 -29.49233 0.6706064200 -16.06979 78.1562 65.0562 1989-Jul-29 04:07 02 43 37.05 +33 08 33.0 294.60 152.79 7.23 15.28 1.0917480167 -29.50701 0.6683122046 -15.71173 77.8474 65.3940 1989-Jul-29 10:07 02 45 58.64 +33 23 47.7 297.28 152.10 7.21 15.27 1.0874866596 -29.52144 0.6660699474 -15.35014 77.5350 65.7338 1989-Jul-29 16:07 02 48 21.92 +33 38 58.0 299.95 151.34 7.19 15.27 1.0832232454 -29.53561 0.6638801560 -14.98505 77.2191 66.0753 1989-Jul-29 22:07 02 50 46.92 +33 54 03.6 302.63 150.51 7.17 15.26 1.0789578117 -29.54952 0.6617433343 -14.61649 76.8997 66.4186 1989-Jul-30 04:07 02 53 13.62 +34 09 04.0 305.29 149.60 7.15 15.26 1.0746903972 -29.56316 0.6596599816 -14.24448 76.5768 66.7636 1989-Jul-30 10:07 02 55 42.05 +34 23 58.7 307.95 148.63 7.13 15.25 1.0704210419 -29.57651 0.6576305926 -13.86905 76.2506 67.1102 1989-Jul-30 16:07 02 58 12.21 +34 38 47.3 310.60 147.57 7.11 15.25 1.0661497869 -29.58958 0.6556556572 -13.49026 75.9209 67.4584 1989-Jul-30 22:07 03 00 44.10 +34 53 29.4 313.23 146.44 7.09 15.24 1.0618766742 -29.60236 0.6537356593 -13.10813 75.5879 67.8081 1989-Jul-31 04:07 03 03 17.72 +35 08 04.5 315.85 145.24 7.07 15.24 1.0576017476 -29.61482 0.6518710769 -12.72272 75.2517 68.1592 1989-Jul-31 10:07 03 05 53.08 +35 22 32.1 318.45 143.95 7.05 15.23 1.0533250516 -29.62698 0.6500623814 -12.33406 74.9122 68.5116 1989-Jul-31 16:07 03 08 30.18 +35 36 51.7 321.03 142.58 7.03 15.23 1.0490466323 -29.63881 0.6483100374 -11.94221 74.5696 68.8653 1989-Jul-31 22:07 03 11 09.00 +35 51 02.9 323.60 141.13 7.01 15.22 1.0447665372 -29.65031 0.6466145018 -11.54722 74.2238 69.2203 1989-Aug-01 04:07 03 13 49.56 +36 05 05.2 326.13 139.60 6.99 15.22 1.0404848148 -29.66147 0.6449762237 -11.14915 73.8751 69.5763 1989-Aug-01 10:07 03 16 31.85 +36 18 58.0 328.64 137.99 6.97 15.22 1.0362015154 -29.67227 0.6433956438 -10.74805 73.5233 69.9333 1989-Aug-01 16:07 03 19 15.85 +36 32 40.9 331.12 136.29 6.95 15.21 1.0319166904 -29.68272 0.6418731940 -10.34400 73.1686 70.2913 1989-Aug-01 22:07 03 22 01.57 +36 46 13.3 333.57 134.51 6.93 15.21 1.0276303929 -29.69279 0.6404092967 -9.93705 72.8111 70.6501 1989-Aug-02 04:07 03 24 48.99 +36 59 34.9 335.98 132.65 6.91 15.21 1.0233426775 -29.70248 0.6390043646 -9.52728 72.4508 71.0097 1989-Aug-02 10:07 03 27 38.09 +37 12 44.9 338.36 130.70 6.89 15.21 1.0190536001 -29.71178 0.6376588005 -9.11475 72.0877 71.3699 1989-Aug-02 16:07 03 30 28.87 +37 25 43.1 340.70 128.66 6.87 15.20 1.0147632184 -29.72067 0.6363729960 -8.69955 71.7221 71.7307 1989-Aug-02 22:07 03 33 21.30 +37 38 28.7 342.99 126.54 6.85 15.20 1.0104715919 -29.72915 0.6351473319 -8.28175 71.3539 72.0919 1989-Aug-03 04:07 03 36 15.38 +37 51 01.4 345.24 124.34 6.83 15.20 1.0061787813 -29.73720 0.6339821775 -7.86143 70.9832 72.4535 1989-Aug-03 10:07 03 39 11.07 +38 03 20.6 347.44 122.05 6.81 15.20 1.0018848494 -29.74481 0.6328778900 -7.43868 70.6101 72.8153 1989-Aug-03 16:07 03 42 08.36 +38 15 25.8 349.59 119.68 6.79 15.19 0.9975898608 -29.75197 0.6318348143 -7.01358 70.2348 73.1772 ************************************************************************************************************************************************* 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