Ephemeris Generator Ephemeris Settings Target Body: Comet 27P/Crommelin = (1984 IV) [1984.17] Observer Location: Geocentric [Code=500] From: A.D. 1984-02-25 09:29 UT To: A.D. 1984-04-19 04:44 Step: 1 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 21:15:03 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Crommelin {source: JPL#04-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1984-Feb-25 09:29:00.0000 UT Stop time : A.D. 1984-Apr-19 04:44:00.0000 UT Step-size : 1440 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= 2445760.5 != 1984-Mar-01.0000000 (TDB) EC= .91918859 QR= .734523711 TP= 2445750.6704114 OM= 250.9010931 W= 195.8407216 IN= 29.1011677 Comet physical & dynamic parameters: GM= n.a. RAD= n.a. A1= 1.639E-9 A2= -3.D-12 M1= 12. M2= 16. k1= 20. k2= 15. 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 ************************************************************************************************************************************************* 1984-Feb-25 09:29 01 31 35.02 -01 31 41.4 213.44 -59.29 9.21 13.86 0.7413492303 4.49187 0.9166274803 -15.56943 45.5680 72.4373 1984-Feb-26 09:29 01 37 17.92 -01 55 43.0 214.93 -60.83 9.22 13.87 0.7441895283 5.32602 0.9077551153 -15.15192 45.9214 72.8828 1984-Feb-27 09:29 01 43 03.26 -02 20 20.6 216.39 -62.28 9.24 13.87 0.7475075991 6.14609 0.8991291187 -14.71643 46.2999 73.2878 1984-Feb-28 09:29 01 48 51.01 -02 45 32.1 217.82 -63.65 9.27 13.89 0.7512947621 6.95023 0.8907597203 -14.26351 46.7037 73.6508 1984-Feb-29 09:29 01 54 41.15 -03 11 15.2 219.22 -64.92 9.29 13.90 0.7555413207 7.73678 0.8826568087 -13.79378 47.1330 73.9702 1984-Mar-01 09:29 02 00 33.66 -03 37 27.5 220.59 -66.08 9.33 13.92 0.7602366632 8.50423 0.8748299139 -13.30786 47.5878 74.2447 1984-Mar-02 09:29 02 06 28.51 -04 04 06.5 221.94 -67.14 9.37 13.95 0.7653693685 9.25127 0.8672881942 -12.80642 48.0683 74.4734 1984-Mar-03 09:29 02 12 25.69 -04 31 09.5 223.25 -68.08 9.41 13.98 0.7709273136 9.97679 0.8600404286 -12.29011 48.5742 74.6556 1984-Mar-04 09:29 02 18 25.18 -04 58 33.7 224.54 -68.90 9.46 14.01 0.7768977828 10.67985 0.8530950120 -11.75960 49.1055 74.7908 1984-Mar-05 09:29 02 24 26.97 -05 26 16.1 225.79 -69.60 9.52 14.05 0.7832675753 11.35971 0.8464599560 -11.21555 49.6618 74.8786 1984-Mar-06 09:29 02 30 31.02 -05 54 13.8 227.01 -70.17 9.57 14.09 0.7900231098 12.01578 0.8401428893 -10.65862 50.2428 74.9192 1984-Mar-07 09:29 02 36 37.31 -06 22 23.5 228.20 -70.61 9.64 14.13 0.7971505253 12.64768 0.8341510632 -10.08946 50.8481 74.9127 1984-Mar-08 09:29 02 42 45.82 -06 50 42.1 229.34 -70.91 9.70 14.18 0.8046357759 13.25515 0.8284913583 -9.50871 51.4770 74.8597 1984-Mar-09 09:29 02 48 56.51 -07 19 06.3 230.45 -71.07 9.77 14.22 0.8124647194 13.83811 0.8231702929 -8.91697 52.1291 74.7606 1984-Mar-10 09:29 02 55 09.34 -07 47 32.9 231.50 -71.10 9.85 14.28 0.8206231990 14.39660 0.8181940334 -8.31486 52.8034 74.6165 1984-Mar-11 09:29 03 01 24.26 -08 15 58.4 232.51 -70.99 9.92 14.33 0.8290971177 14.93077 0.8135684055 -7.70294 53.4992 74.4283 1984-Mar-12 09:29 03 07 41.21 -08 44 19.5 233.45 -70.74 10.00 14.39 0.8378725045 15.44090 0.8092989061 -7.08179 54.2156 74.1972 1984-Mar-13 09:29 03 14 00.11 -09 12 32.9 234.33 -70.35 10.09 14.45 0.8469355729 15.92735 0.8053907120 -6.45195 54.9515 73.9246 1984-Mar-14 09:29 03 20 20.90 -09 40 35.1 235.15 -69.81 10.17 14.51 0.8562727730 16.39057 0.8018486845 -5.81396 55.7059 73.6120 1984-Mar-15 09:29 03 26 43.47 -10 08 22.9 235.89 -69.14 10.26 14.57 0.8658708341 16.83108 0.7986773647 -5.16840 56.4775 73.2609 1984-Mar-16 09:29 03 33 07.73 -10 35 52.9 236.55 -68.33 10.35 14.64 0.8757168029 17.24946 0.7958809567 -4.51586 57.2652 72.8730 1984-Mar-17 09:29 03 39 33.57 -11 03 01.9 237.13 -67.39 10.44 14.71 0.8857980728 17.64633 0.7934633025 -3.85699 58.0676 72.4502 1984-Mar-18 09:29 03 46 00.87 -11 29 46.7 237.62 -66.31 10.54 14.78 0.8961024088 18.02235 0.7914278521 -3.19251 58.8834 71.9942 1984-Mar-19 09:29 03 52 29.50 -11 56 04.1 238.01 -65.11 10.64 14.85 0.9066179660 18.37820 0.7897776395 -2.52314 59.7111 71.5068 1984-Mar-20 09:29 03 58 59.31 -12 21 51.2 238.31 -63.79 10.73 14.92 0.9173333033 18.71460 0.7885152728 -1.84962 60.5495 70.9902 1984-Mar-21 09:29 04 05 30.16 -12 47 05.2 238.49 -62.35 10.83 15.00 0.9282373928 19.03227 0.7876429392 -1.17267 61.3969 70.4461 1984-Mar-22 09:29 04 12 01.86 -13 11 43.3 238.56 -60.80 10.94 15.07 0.9393196251 19.33193 0.7871624223 -0.49297 62.2519 69.8767 1984-Mar-23 09:29 04 18 34.23 -13 35 43.1 238.52 -59.16 11.04 15.15 0.9505698110 19.61431 0.7870751237 0.18885 63.1129 69.2838 1984-Mar-24 09:29 04 25 07.08 -13 59 02.3 238.35 -57.42 11.14 15.23 0.9619781802 19.88013 0.7873820839 0.87217 63.9786 68.6694 1984-Mar-25 09:29 04 31 40.21 -14 21 38.7 238.06 -55.60 11.25 15.31 0.9735353777 20.13011 0.7880839987 1.55640 64.8473 68.0356 1984-Mar-26 09:29 04 38 13.39 -14 43 30.5 237.63 -53.70 11.36 15.39 0.9852324577 20.36495 0.7891812306 2.24098 65.7174 67.3843 1984-Mar-27 09:29 04 44 46.41 -15 04 35.9 237.08 -51.74 11.46 15.47 0.9970608761 20.58534 0.7906738168 2.92534 66.5876 66.7173 1984-Mar-28 09:29 04 51 19.02 -15 24 53.5 236.38 -49.72 11.57 15.55 1.0090124810 20.79195 0.7925614743 3.60895 67.4562 66.0367 1984-Mar-29 09:29 04 57 51.00 -15 44 22.1 235.56 -47.66 11.68 15.64 1.0210795021 20.98542 0.7948436042 4.29125 68.3217 65.3443 1984-Mar-30 09:29 05 04 22.09 -16 03 00.7 234.59 -45.55 11.79 15.72 1.0332545400 21.16639 0.7975192963 4.97171 69.1828 64.6418 1984-Mar-31 09:29 05 10 52.05 -16 20 48.4 233.49 -43.42 11.90 15.81 1.0455305534 21.33548 0.8005873341 5.64980 70.0379 63.9310 1984-Apr-01 09:29 05 17 20.64 -16 37 44.8 232.25 -41.27 12.02 15.89 1.0579008470 21.49326 0.8040462015 6.32502 70.8857 63.2136 1984-Apr-02 09:29 05 23 47.61 -16 53 49.4 230.88 -39.11 12.13 15.98 1.0703590586 21.64030 0.8078940912 6.99686 71.7247 62.4912 1984-Apr-03 09:29 05 30 12.72 -17 09 02.1 229.38 -36.95 12.24 16.07 1.0828991462 21.77715 0.8121289144 7.66485 72.5538 61.7654 1984-Apr-04 09:29 05 36 35.72 -17 23 23.1 227.76 -34.80 12.35 16.15 1.0955153743 21.90432 0.8167483123 8.32853 73.3716 61.0376 1984-Apr-05 09:29 05 42 56.37 -17 36 52.5 226.01 -32.66 12.47 16.24 1.1082023016 22.02232 0.8217496685 8.98747 74.1770 60.3093 1984-Apr-06 09:29 05 49 14.45 -17 49 30.9 224.14 -30.55 12.58 16.33 1.1209547679 22.13161 0.8271301230 9.64126 74.9687 59.5818 1984-Apr-07 09:29 05 55 29.73 -18 01 18.9 222.17 -28.46 12.69 16.42 1.1337678810 22.23266 0.8328865878 10.28951 75.7457 58.8563 1984-Apr-08 09:29 06 01 41.99 -18 12 17.4 220.08 -26.42 12.81 16.51 1.1466370050 22.32589 0.8390157629 10.93188 76.5070 58.1341 1984-Apr-09 09:29 06 07 51.03 -18 22 27.1 217.90 -24.41 12.92 16.60 1.1595577479 22.41172 0.8455141554 11.56805 77.2516 57.4162 1984-Apr-10 09:29 06 13 56.66 -18 31 49.4 215.62 -22.46 13.04 16.69 1.1725259496 22.49054 0.8523780984 12.19773 77.9786 56.7036 1984-Apr-11 09:29 06 19 58.68 -18 40 25.3 213.26 -20.55 13.15 16.78 1.1855376712 22.56272 0.8596037715 12.82068 78.6873 55.9974 1984-Apr-12 09:29 06 25 56.93 -18 48 16.3 210.82 -18.71 13.26 16.87 1.1985891836 22.62862 0.8671872192 13.43667 79.3767 55.2983 1984-Apr-13 09:29 06 31 51.27 -18 55 23.6 208.31 -16.92 13.38 16.96 1.2116769569 22.68857 0.8751243664 14.04551 80.0463 54.6071 1984-Apr-14 09:29 06 37 41.54 -19 01 48.9 205.74 -15.20 13.49 17.05 1.2247976508 22.74290 0.8834110263 14.64701 80.6954 53.9245 1984-Apr-15 09:29 06 43 27.63 -19 07 33.6 203.12 -13.54 13.61 17.14 1.2379481045 22.79189 0.8920429026 15.24097 81.3235 53.2512 1984-Apr-16 09:29 06 49 09.44 -19 12 39.3 200.45 -11.95 13.72 17.23 1.2511253277 22.83585 0.9010155846 15.82720 81.9300 52.5877 1984-Apr-17 09:29 06 54 46.86 -19 17 07.8 197.75 -10.43 13.83 17.32 1.2643264914 22.87505 0.9103245422 16.40548 82.5146 51.9345 1984-Apr-18 09:29 07 00 19.83 -19 21 00.6 195.03 -8.99 13.95 17.41 1.2775489200 22.90973 0.9199651235 16.97560 83.0770 51.2919 ************************************************************************************************************************************************* 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