Ephemeris Generator Ephemeris Settings Target Body: Comet 97P/Metcalf-Brewington = (1991 I) [1991.00] Observer Location: Geocentric [Code=500] From: A.D. 1991-01-10 02:38 UT To: A.D. 1991-01-10 04:08 Step: 5 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 08:58:59 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Metcalf-Brewington {source: JPL#03-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1991-Jan-10 02:38:00.0000 UT Stop time : A.D. 1991-Jan-10 04:08:00.0000 UT Step-size : 5 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= 2448280.5 != 1991-Jan-24.0000000 (TDB) EC= .5938400109999999 QR= 1.591471646 TP= 2448262.1110873 OM= 187.7865342 W= 208.0406112 IN= 13.0277899 Comet physical & dynamic parameters: GM= n.a. RAD= n.a. A1= 6.997E-9 A2= 6.56D-10 M1= 4. M2= 16.5 k1= 20. 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 ************************************************************************************************************************************************* 1991-Jan-10 02:38 00 16 14.80 -05 29 58.3 99.32 28.05 9.04 19.59 1.5921706270 0.53612 1.5860666588 12.04505 72.3180 36.0445 1991-Jan-10 02:43 00 16 15.35 -05 29 55.9 99.32 28.05 9.04 19.59 1.5921717084 0.53653 1.5860908171 12.04531 72.3169 36.0442 1991-Jan-10 02:48 00 16 15.90 -05 29 53.6 99.32 28.05 9.04 19.59 1.5921727907 0.53695 1.5861149760 12.04556 72.3158 36.0440 1991-Jan-10 02:53 00 16 16.46 -05 29 51.3 99.32 28.05 9.04 19.59 1.5921738738 0.53737 1.5861391354 12.04582 72.3146 36.0437 1991-Jan-10 02:58 00 16 17.01 -05 29 48.9 99.32 28.05 9.04 19.59 1.5921749577 0.53778 1.5861632953 12.04607 72.3135 36.0434 1991-Jan-10 03:03 00 16 17.57 -05 29 46.6 99.32 28.05 9.04 19.59 1.5921760425 0.53820 1.5861874557 12.04633 72.3123 36.0431 1991-Jan-10 03:08 00 16 18.12 -05 29 44.3 99.32 28.05 9.04 19.59 1.5921771281 0.53862 1.5862116166 12.04658 72.3112 36.0428 1991-Jan-10 03:13 00 16 18.68 -05 29 41.9 99.32 28.05 9.04 19.59 1.5921782146 0.53903 1.5862357780 12.04684 72.3101 36.0425 1991-Jan-10 03:18 00 16 19.23 -05 29 39.6 99.32 28.05 9.04 19.59 1.5921793018 0.53945 1.5862599400 12.04709 72.3089 36.0422 1991-Jan-10 03:23 00 16 19.79 -05 29 37.2 99.32 28.06 9.04 19.59 1.5921803899 0.53986 1.5862841024 12.04735 72.3078 36.0420 1991-Jan-10 03:28 00 16 20.34 -05 29 34.9 99.32 28.06 9.04 19.59 1.5921814789 0.54028 1.5863082654 12.04760 72.3067 36.0417 1991-Jan-10 03:33 00 16 20.89 -05 29 32.6 99.32 28.06 9.04 19.59 1.5921825687 0.54070 1.5863324289 12.04786 72.3055 36.0414 1991-Jan-10 03:38 00 16 21.45 -05 29 30.2 99.33 28.06 9.04 19.59 1.5921836593 0.54111 1.5863565929 12.04811 72.3044 36.0411 1991-Jan-10 03:43 00 16 22.00 -05 29 27.9 99.33 28.06 9.04 19.59 1.5921847507 0.54153 1.5863807574 12.04837 72.3033 36.0408 1991-Jan-10 03:48 00 16 22.56 -05 29 25.6 99.33 28.06 9.04 19.59 1.5921858430 0.54195 1.5864049224 12.04862 72.3021 36.0405 1991-Jan-10 03:53 00 16 23.11 -05 29 23.2 99.33 28.06 9.04 19.59 1.5921869361 0.54236 1.5864290879 12.04888 72.3010 36.0402 1991-Jan-10 03:58 00 16 23.67 -05 29 20.9 99.33 28.06 9.04 19.59 1.5921880301 0.54278 1.5864532539 12.04913 72.2999 36.0399 1991-Jan-10 04:03 00 16 24.22 -05 29 18.5 99.33 28.06 9.04 19.59 1.5921891248 0.54319 1.5864774205 12.04939 72.2987 36.0397 1991-Jan-10 04:08 00 16 24.77 -05 29 16.2 99.33 28.06 9.04 19.59 1.5921902205 0.54361 1.5865015875 12.04964 72.2976 36.0394 ************************************************************************************************************************************************* 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