Ephemeris Generator Ephemeris Settings Target Body: Comet 26P/Grigg-Skjellerup = (1982 IV) [1982.33] Observer Location: Geocentric [Code=500] From: A.D. 1982-04-27 20:13 UT To: A.D. 1982-04-27 22:58 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 20:53:28 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Grigg-Skjellerup {source: JPL#14-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1982-Apr-27 20:13:00.0000 UT Stop time : A.D. 1982-Apr-27 22:58:00.0000 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 : 2.2 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= 2445120.5 != 1982-May-31.0000000 (TDB) EC= .665679853 QR= .989247722 TP= 2445104.4966172 OM= 213.3412737 W= 359.3167915 IN= 21.1312829 Comet physical & dynamic parameters: GM= n.a. RAD= 2.2 A1= 4.7D-11 A2= -1.1D-11 M1= 12.5 M2= 17. k1= 10. 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 ************************************************************************************************************************************************* 1982-Apr-27 20:13 07 34 40.19 +03 45 10.7 124.65 96.02 10.90 17.62 1.0182292983 -5.72932 0.4616295752 -10.09017 78.2194 75.4316 1982-Apr-27 20:18 07 34 40.88 +03 45 18.7 124.66 96.03 10.90 17.62 1.0182178190 -5.72826 0.4616093391 -10.09004 78.2185 75.4336 1982-Apr-27 20:23 07 34 41.58 +03 45 26.7 124.67 96.03 10.90 17.62 1.0182063418 -5.72720 0.4615891034 -10.08991 78.2176 75.4355 1982-Apr-27 20:28 07 34 42.27 +03 45 34.7 124.68 96.04 10.90 17.62 1.0181948667 -5.72614 0.4615688680 -10.08977 78.2167 75.4375 1982-Apr-27 20:33 07 34 42.97 +03 45 42.7 124.70 96.05 10.90 17.62 1.0181833938 -5.72508 0.4615486328 -10.08964 78.2157 75.4394 1982-Apr-27 20:38 07 34 43.66 +03 45 50.7 124.71 96.06 10.90 17.62 1.0181719229 -5.72401 0.4615283979 -10.08951 78.2148 75.4413 1982-Apr-27 20:43 07 34 44.35 +03 45 58.7 124.72 96.06 10.90 17.62 1.0181604542 -5.72295 0.4615081632 -10.08938 78.2139 75.4433 1982-Apr-27 20:48 07 34 45.05 +03 46 06.7 124.73 96.07 10.90 17.62 1.0181489877 -5.72189 0.4614879288 -10.08925 78.2130 75.4452 1982-Apr-27 20:53 07 34 45.74 +03 46 14.7 124.74 96.08 10.90 17.62 1.0181375232 -5.72083 0.4614676947 -10.08912 78.2121 75.4472 1982-Apr-27 20:58 07 34 46.44 +03 46 22.7 124.76 96.09 10.90 17.62 1.0181260609 -5.71977 0.4614474608 -10.08899 78.2111 75.4491 1982-Apr-27 21:03 07 34 47.13 +03 46 30.7 124.77 96.10 10.90 17.62 1.0181146007 -5.71871 0.4614272272 -10.08885 78.2102 75.4511 1982-Apr-27 21:08 07 34 47.83 +03 46 38.7 124.78 96.10 10.90 17.62 1.0181031427 -5.71765 0.4614069939 -10.08872 78.2093 75.4530 1982-Apr-27 21:13 07 34 48.52 +03 46 46.7 124.79 96.11 10.90 17.62 1.0180916868 -5.71659 0.4613867608 -10.08859 78.2084 75.4549 1982-Apr-27 21:18 07 34 49.22 +03 46 54.8 124.80 96.12 10.90 17.62 1.0180802330 -5.71552 0.4613665280 -10.08846 78.2075 75.4569 1982-Apr-27 21:23 07 34 49.91 +03 47 02.8 124.81 96.13 10.90 17.62 1.0180687813 -5.71446 0.4613462955 -10.08833 78.2065 75.4588 1982-Apr-27 21:28 07 34 50.61 +03 47 10.8 124.83 96.14 10.90 17.62 1.0180573318 -5.71340 0.4613260632 -10.08819 78.2056 75.4607 1982-Apr-27 21:33 07 34 51.30 +03 47 18.8 124.84 96.14 10.90 17.62 1.0180458843 -5.71234 0.4613058312 -10.08806 78.2047 75.4627 1982-Apr-27 21:38 07 34 52.00 +03 47 26.8 124.85 96.15 10.90 17.62 1.0180344391 -5.71128 0.4612855994 -10.08793 78.2038 75.4646 1982-Apr-27 21:43 07 34 52.69 +03 47 34.8 124.86 96.16 10.90 17.62 1.0180229959 -5.71022 0.4612653680 -10.08779 78.2029 75.4666 1982-Apr-27 21:48 07 34 53.39 +03 47 42.8 124.87 96.17 10.90 17.62 1.0180115549 -5.70915 0.4612451368 -10.08766 78.2019 75.4685 1982-Apr-27 21:53 07 34 54.08 +03 47 50.8 124.89 96.17 10.90 17.62 1.0180001160 -5.70809 0.4612249058 -10.08753 78.2010 75.4704 1982-Apr-27 21:58 07 34 54.78 +03 47 58.9 124.90 96.18 10.90 17.62 1.0179886792 -5.70703 0.4612046751 -10.08739 78.2001 75.4724 1982-Apr-27 22:03 07 34 55.47 +03 48 06.9 124.91 96.19 10.90 17.62 1.0179772446 -5.70597 0.4611844447 -10.08726 78.1992 75.4743 1982-Apr-27 22:08 07 34 56.17 +03 48 14.9 124.92 96.20 10.90 17.62 1.0179658121 -5.70491 0.4611642146 -10.08713 78.1983 75.4763 1982-Apr-27 22:13 07 34 56.87 +03 48 22.9 124.93 96.21 10.90 17.62 1.0179543817 -5.70384 0.4611439847 -10.08699 78.1973 75.4782 1982-Apr-27 22:18 07 34 57.56 +03 48 30.9 124.95 96.21 10.90 17.62 1.0179429535 -5.70278 0.4611237551 -10.08686 78.1964 75.4801 1982-Apr-27 22:23 07 34 58.26 +03 48 39.0 124.96 96.22 10.90 17.62 1.0179315274 -5.70172 0.4611035258 -10.08672 78.1955 75.4821 1982-Apr-27 22:28 07 34 58.95 +03 48 47.0 124.97 96.23 10.90 17.62 1.0179201034 -5.70066 0.4610832967 -10.08659 78.1946 75.4840 1982-Apr-27 22:33 07 34 59.65 +03 48 55.0 124.98 96.24 10.90 17.62 1.0179086816 -5.69960 0.4610630679 -10.08646 78.1937 75.4860 1982-Apr-27 22:38 07 35 00.35 +03 49 03.0 124.99 96.24 10.90 17.62 1.0178972618 -5.69853 0.4610428394 -10.08632 78.1928 75.4879 1982-Apr-27 22:43 07 35 01.04 +03 49 11.0 125.01 96.25 10.90 17.62 1.0178858442 -5.69747 0.4610226112 -10.08619 78.1918 75.4898 1982-Apr-27 22:48 07 35 01.74 +03 49 19.1 125.02 96.26 10.90 17.62 1.0178744288 -5.69641 0.4610023832 -10.08605 78.1909 75.4918 1982-Apr-27 22:53 07 35 02.43 +03 49 27.1 125.03 96.27 10.90 17.62 1.0178630155 -5.69535 0.4609821555 -10.08592 78.1900 75.4937 1982-Apr-27 22:58 07 35 03.13 +03 49 35.1 125.04 96.28 10.90 17.62 1.0178516043 -5.69428 0.4609619280 -10.08578 78.1891 75.4956 ************************************************************************************************************************************************* 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