Ephemeris Generator Ephemeris Settings Target Body: Comet 21P/Giacobini-Zinner [1985] Observer Location: Geocentric [Code=500] From: A.D. 1985-06-22 14:34 UT To: A.D. 1985-10-08 11:10 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 21:27:01 1999 Pasadena, USA / JPL-Horizons ******************************************************************************* Target body name: Giacobini-Zinner {source: JPL#113-DASTCOM3} Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 1985-Jun-22 14:34:00.0000 UT Stop time : A.D. 1985-Oct-08 11:10:00.0000 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= 2446320.5 != 1985-Sep-12.0000000 (TDB) EC= .707511389 QR= 1.028267921 TP= 2446313.7060281 OM= 195.4086726 W= 172.4802098 IN= 31.8726314 Comet physical & dynamic parameters: GM= n.a. RAD= n.a. A1= 3.747E-9 A2= -1.02D-10 M1= 9. M2= 15.5 k1= 17. 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 ************************************************************************************************************************************************* 1985-Jun-22 14:34 21 43 04.81 +44 49 38.8 76.58 80.82 11.55 17.48 1.4431642682 -15.14291 0.9307416752 -16.38396 95.5590 44.5077 1985-Jun-23 14:34 21 45 59.55 +45 21 56.5 77.59 80.62 11.49 17.45 1.4344351020 -15.08840 0.9213206428 -16.24082 95.3770 44.8715 1985-Jun-24 14:34 21 48 58.34 +45 54 08.9 78.66 80.38 11.42 17.43 1.4257381699 -15.03135 0.9119815526 -16.10019 95.1886 45.2404 1985-Jun-25 14:34 21 52 01.39 +46 26 15.0 79.78 80.10 11.35 17.40 1.4170749536 -14.97171 0.9027229506 -15.96208 94.9941 45.6146 1985-Jun-26 14:34 21 55 08.93 +46 58 14.0 80.96 79.78 11.28 17.38 1.4084469760 -14.90940 0.8935433612 -15.82655 94.7935 45.9941 1985-Jun-27 14:34 21 58 21.19 +47 30 04.7 82.20 79.41 11.22 17.36 1.3998558025 -14.84433 0.8844412877 -15.69363 94.5869 46.3788 1985-Jun-28 14:34 22 01 38.41 +48 01 46.0 83.49 79.00 11.15 17.33 1.3913030415 -14.77645 0.8754152152 -15.56335 94.3747 46.7688 1985-Jun-29 14:34 22 05 00.86 +48 33 16.8 84.85 78.54 11.08 17.31 1.3827903454 -14.70567 0.8664636152 -15.43571 94.1569 47.1641 1985-Jun-30 14:34 22 08 28.79 +49 04 35.9 86.27 78.02 11.01 17.28 1.3743194115 -14.63190 0.8575849561 -15.31073 93.9337 47.5646 1985-Jul-01 14:34 22 12 02.48 +49 35 42.0 87.75 77.45 10.95 17.26 1.3658918850 -14.55509 0.8487776153 -15.18836 93.7052 47.9705 1985-Jul-02 14:34 22 15 42.20 +50 06 33.6 89.30 76.81 10.88 17.24 1.3575097498 -14.47513 0.8400403040 -15.06854 93.4717 48.3816 1985-Jul-03 14:34 22 19 28.24 +50 37 09.2 90.91 76.12 10.81 17.21 1.3491747439 -14.39196 0.8313714752 -14.95116 93.2334 48.7980 1985-Jul-04 14:34 22 23 20.90 +51 07 27.2 92.59 75.35 10.74 17.19 1.3408887501 -14.30548 0.8227697506 -14.83611 92.9905 49.2196 1985-Jul-05 14:34 22 27 20.50 +51 37 25.9 94.34 74.51 10.67 17.17 1.3326536998 -14.21562 0.8142338327 -14.72323 92.7431 49.6464 1985-Jul-06 14:34 22 31 27.35 +52 07 03.4 96.16 73.58 10.61 17.14 1.3244715726 -14.12229 0.8057625158 -14.61235 92.4915 50.0783 1985-Jul-07 14:34 22 35 41.79 +52 36 17.5 98.05 72.57 10.54 17.12 1.3163443976 -14.02541 0.7973546932 -14.50330 92.2360 50.5152 1985-Jul-08 14:34 22 40 04.16 +53 05 06.2 100.01 71.46 10.47 17.10 1.3082742529 -13.92488 0.7890093619 -14.39589 91.9766 50.9571 1985-Jul-09 14:34 22 44 34.80 +53 33 27.1 102.05 70.25 10.40 17.07 1.3002632670 -13.82062 0.7807256270 -14.28994 91.7137 51.4039 1985-Jul-10 14:34 22 49 14.07 +54 01 17.6 104.16 68.93 10.33 17.05 1.2923136182 -13.71255 0.7725027059 -14.18524 91.4475 51.8555 1985-Jul-11 14:34 22 54 02.34 +54 28 35.2 106.35 67.49 10.26 17.03 1.2844275353 -13.60058 0.7643399337 -14.08159 91.1781 52.3119 1985-Jul-12 14:34 22 58 59.95 +54 55 16.7 108.61 65.93 10.20 17.01 1.2766072974 -13.48462 0.7562367709 -13.97876 90.9059 52.7728 1985-Jul-13 14:34 23 04 07.27 +55 21 19.3 110.94 64.24 10.13 16.98 1.2688552341 -13.36458 0.7481928110 -13.87651 90.6309 53.2382 1985-Jul-14 14:34 23 09 24.65 +55 46 39.5 113.35 62.40 10.06 16.96 1.2611737254 -13.24038 0.7402077916 -13.77459 90.3535 53.7080 1985-Jul-15 14:34 23 14 52.43 +56 11 13.8 115.84 60.41 9.99 16.94 1.2535652013 -13.11193 0.7322816041 -13.67271 90.0738 54.1820 1985-Jul-16 14:34 23 20 30.95 +56 34 58.4 118.39 58.25 9.92 16.92 1.2460321416 -12.97914 0.7244143059 -13.57059 89.7920 54.6602 1985-Jul-17 14:34 23 26 20.51 +56 57 49.3 121.01 55.93 9.86 16.90 1.2385770753 -12.84193 0.7166061306 -13.46790 89.5084 55.1422 1985-Jul-18 14:34 23 32 21.41 +57 19 42.1 123.70 53.42 9.79 16.87 1.2312025800 -12.70022 0.7088574971 -13.36432 89.2231 55.6281 1985-Jul-19 14:34 23 38 33.91 +57 40 32.5 126.44 50.72 9.72 16.85 1.2239112812 -12.55392 0.7011690163 -13.25952 88.9364 56.1175 1985-Jul-20 14:34 23 44 58.21 +58 00 15.5 129.23 47.81 9.65 16.83 1.2167058514 -12.40295 0.6935414950 -13.15315 88.6485 56.6104 1985-Jul-21 14:34 23 51 34.50 +58 18 46.2 132.07 44.69 9.59 16.81 1.2095890086 -12.24724 0.6859759362 -13.04488 88.3595 57.1065 1985-Jul-22 14:34 23 58 22.88 +58 35 59.4 134.95 41.35 9.52 16.79 1.2025635154 -12.08671 0.6784735381 -12.93436 88.0697 57.6056 1985-Jul-23 14:34 00 05 23.41 +58 51 49.6 137.85 37.77 9.45 16.76 1.1956321772 -11.92129 0.6710356908 -12.82127 87.7791 58.1076 1985-Jul-24 14:34 00 12 36.06 +59 06 11.1 140.77 33.96 9.39 16.74 1.1887978409 -11.75090 0.6636639738 -12.70529 87.4881 58.6121 1985-Jul-25 14:34 00 20 00.70 +59 18 58.1 143.69 29.90 9.32 16.72 1.1820633924 -11.57548 0.6563601539 -12.58608 87.1968 59.1189 1985-Jul-26 14:34 00 27 37.12 +59 30 04.6 146.60 25.58 9.26 16.70 1.1754317548 -11.39497 0.6491261848 -12.46333 86.9053 59.6278 1985-Jul-27 14:34 00 35 25.00 +59 39 24.4 149.48 21.00 9.19 16.68 1.1689058861 -11.20931 0.6419642090 -12.33671 86.6140 60.1385 1985-Jul-28 14:34 00 43 23.90 +59 46 51.2 152.31 16.17 9.13 16.66 1.1624887764 -11.01845 0.6348765618 -12.20587 86.3229 60.6505 1985-Jul-29 14:34 00 51 33.26 +59 52 18.9 155.07 11.07 9.06 16.64 1.1561834449 -10.82234 0.6278657804 -12.07046 86.0324 61.1637 1985-Jul-30 14:34 00 59 52.39 +59 55 41.0 157.76 5.71 9.00 16.62 1.1499929373 -10.62093 0.6209346144 -11.93010 85.7426 61.6776 1985-Jul-31 14:34 01 08 20.51 +59 56 51.3 160.34 0.09 8.93 16.60 1.1439203217 -10.41419 0.6140860419 -11.78437 85.4539 62.1917 1985-Aug-01 14:34 01 16 56.67 +59 55 43.7 162.80 -5.78 8.87 16.58 1.1379686856 -10.20209 0.6073232854 -11.63285 85.1664 62.7057 1985-Aug-02 14:34 01 25 39.86 +59 52 12.2 165.12 -11.90 8.81 16.56 1.1321411318 -9.98461 0.6006498284 -11.47506 84.8806 63.2190 1985-Aug-03 14:34 01 34 28.94 +59 46 11.2 167.28 -18.24 8.75 16.54 1.1264407738 -9.76173 0.5940694298 -11.31051 84.5966 63.7310 1985-Aug-04 14:34 01 43 22.68 +59 37 35.2 169.27 -24.80 8.69 16.52 1.1208707320 -9.53345 0.5875861340 -11.13872 84.3149 64.2412 1985-Aug-05 14:34 01 52 19.80 +59 26 19.4 171.07 -31.56 8.63 16.50 1.1154341287 -9.29976 0.5812042773 -10.95916 84.0357 64.7490 1985-Aug-06 14:34 02 01 18.93 +59 12 19.1 172.68 -38.50 8.57 16.48 1.1101340829 -9.06067 0.5749284902 -10.77133 83.7594 65.2537 1985-Aug-07 14:34 02 10 18.71 +58 55 30.3 174.08 -45.60 8.51 16.46 1.1049737055 -8.81621 0.5687636955 -10.57472 83.4865 65.7545 1985-Aug-08 14:34 02 19 17.75 +58 35 49.6 175.26 -52.83 8.45 16.45 1.0999560936 -8.56640 0.5627151054 -10.36885 83.2172 66.2508 1985-Aug-09 14:34 02 28 14.66 +58 13 14.1 176.22 -60.16 8.40 16.43 1.0950843245 -8.31128 0.5567882156 -10.15322 82.9520 66.7417 1985-Aug-10 14:34 02 37 08.12 +57 47 41.6 176.96 -67.58 8.34 16.41 1.0903614504 -8.05090 0.5509887992 -9.92735 82.6914 67.2264 1985-Aug-11 14:34 02 45 56.84 +57 19 10.5 177.48 -75.04 8.29 16.39 1.0857904915 -7.78533 0.5453229000 -9.69080 82.4358 67.7040 1985-Aug-12 14:34 02 54 39.62 +56 47 39.9 177.78 -82.53 8.24 16.38 1.0813744304 -7.51462 0.5397968246 -9.44310 82.1856 68.1736 1985-Aug-13 14:34 03 03 15.34 +56 13 09.5 177.86 -90.02 8.19 16.36 1.0771162048 -7.23887 0.5344171341 -9.18382 81.9413 68.6342 1985-Aug-14 14:34 03 11 42.99 +55 35 39.8 177.73 -97.47 8.14 16.34 1.0730187013 -6.95817 0.5291906337 -8.91256 81.7035 69.0848 1985-Aug-15 14:34 03 20 01.66 +54 55 11.8 177.41 -104.87 8.09 16.33 1.0690847488 -6.67263 0.5241243565 -8.62894 81.4726 69.5243 1985-Aug-16 14:34 03 28 10.59 +54 11 47.2 176.89 -112.19 8.04 16.31 1.0653171107 -6.38235 0.5192255422 -8.33262 81.2493 69.9518 1985-Aug-17 14:34 03 36 09.12 +53 25 28.2 176.20 -119.40 8.00 16.30 1.0617184790 -6.08749 0.5145016041 -8.02334 81.0339 70.3661 1985-Aug-18 14:34 03 43 56.70 +52 36 17.8 175.35 -126.47 7.96 16.28 1.0582914666 -5.78817 0.5099600844 -7.70092 80.8271 70.7660 1985-Aug-19 14:34 03 51 32.94 +51 44 19.5 174.33 -133.39 7.91 16.27 1.0550386004 -5.48455 0.5056085976 -7.36530 80.6295 71.1506 1985-Aug-20 14:34 03 58 57.52 +50 49 37.3 173.18 -140.12 7.88 16.26 1.0519623146 -5.17680 0.5014547645 -7.01651 80.4415 71.5186 1985-Aug-21 14:34 04 06 10.25 +49 52 15.8 171.90 -146.65 7.84 16.24 1.0490649435 -4.86509 0.4975061418 -6.65473 80.2637 71.8690 1985-Aug-22 14:34 04 13 11.02 +48 52 20.2 170.50 -152.96 7.80 16.23 1.0463487148 -4.54962 0.4937701519 -6.28026 80.0967 72.2005 1985-Aug-23 14:34 04 19 59.80 +47 49 56.1 168.99 -159.03 7.77 16.22 1.0438157432 -4.23060 0.4902540156 -5.89350 79.9410 72.5122 1985-Aug-24 14:34 04 26 36.65 +46 45 09.7 167.38 -164.83 7.74 16.21 1.0414680238 -3.90822 0.4869646896 -5.49495 79.7971 72.8030 1985-Aug-25 14:34 04 33 01.66 +45 38 07.3 165.68 -170.35 7.71 16.20 1.0393074256 -3.58271 0.4839088099 -5.08522 79.6655 73.0718 1985-Aug-26 14:34 04 39 15.02 +44 28 56.0 163.90 -175.57 7.68 16.19 1.0373356862 -3.25431 0.4810926386 -4.66501 79.5469 73.3177 1985-Aug-27 14:34 04 45 16.91 +43 17 43.1 162.04 -180.48 7.66 16.18 1.0355544059 -2.92326 0.4785220161 -4.23506 79.4416 73.5396 1985-Aug-28 14:34 04 51 07.59 +42 04 36.3 160.12 -185.07 7.64 16.17 1.0339650423 -2.58981 0.4762023175 -3.79624 79.3501 73.7367 1985-Aug-29 14:34 04 56 47.32 +40 49 43.4 158.12 -189.32 7.62 16.17 1.0325689059 -2.25422 0.4741384129 -3.34945 79.2729 73.9082 1985-Aug-30 14:34 05 02 16.40 +39 33 12.8 156.06 -193.21 7.60 16.16 1.0313671553 -1.91676 0.4723346320 -2.89564 79.2105 74.0532 1985-Aug-31 14:34 05 07 35.14 +38 15 12.9 153.95 -196.75 7.58 16.15 1.0303607934 -1.57769 0.4707947318 -2.43584 79.1630 74.1712 1985-Sep-01 14:34 05 12 43.84 +36 55 52.5 151.77 -199.93 7.57 16.15 1.0295506643 -1.23730 0.4695218680 -1.97111 79.1310 74.2616 1985-Sep-02 14:34 05 17 42.84 +35 35 20.3 149.55 -202.73 7.56 16.15 1.0289374496 -0.89586 0.4685185668 -1.50256 79.1146 74.3239 1985-Sep-03 14:34 05 22 32.44 +34 13 45.2 147.28 -205.16 7.56 16.14 1.0285216670 -0.55367 0.4677867011 -1.03135 79.1140 74.3578 1985-Sep-04 14:34 05 27 12.98 +32 51 16.4 144.96 -207.22 7.55 16.14 1.0283036676 -0.21101 0.4673274694 -0.55866 79.1294 74.3630 1985-Sep-05 14:34 05 31 44.77 +31 28 02.7 142.60 -208.90 7.55 16.14 1.0282836353 0.13182 0.4671413800 -0.08569 79.1609 74.3394 1985-Sep-06 14:34 05 36 08.11 +30 04 13.1 140.20 -210.21 7.55 16.14 1.0284615858 0.47454 0.4672282394 0.38633 79.2085 74.2871 1985-Sep-07 14:34 05 40 23.31 +28 39 56.4 137.76 -211.16 7.56 16.14 1.0288373667 0.81685 0.4675871512 0.85620 79.2720 74.2061 1985-Sep-08 14:34 05 44 30.66 +27 15 21.5 135.29 -211.74 7.57 16.14 1.0294106581 1.15847 0.4682165211 1.32271 79.3514 74.0967 1985-Sep-09 14:34 05 48 30.43 +25 50 36.6 132.78 -211.98 7.58 16.14 1.0301809735 1.49910 0.4691140724 1.78471 79.4466 73.9593 1985-Sep-10 14:34 05 52 22.89 +24 25 50.2 130.24 -211.88 7.59 16.14 1.0311476617 1.83847 0.4702768722 2.24108 79.5571 73.7944 1985-Sep-11 14:34 05 56 08.31 +23 01 10.0 127.68 -211.46 7.60 16.15 1.0323099090 2.17629 0.4717013641 2.69077 79.6828 73.6025 1985-Sep-12 14:34 05 59 46.92 +21 36 43.8 125.09 -210.73 7.62 16.15 1.0336667420 2.51229 0.4733834086 3.13282 79.8233 73.3844 1985-Sep-13 14:34 06 03 18.97 +20 12 38.8 122.48 -209.70 7.64 16.15 1.0352170311 2.84621 0.4753183271 3.56632 79.9782 73.1409 1985-Sep-14 14:34 06 06 44.66 +18 49 01.8 119.85 -208.39 7.66 16.16 1.0369594941 3.17778 0.4775009400 3.99045 80.1469 72.8728 1985-Sep-15 14:34 06 10 04.23 +17 25 59.3 117.22 -206.83 7.69 16.17 1.0388927006 3.50675 0.4799255990 4.40440 80.3291 72.5811 1985-Sep-16 14:34 06 13 17.88 +16 03 37.2 114.57 -205.02 7.71 16.17 1.0410150771 3.83287 0.4825862098 4.80742 80.5241 72.2668 1985-Sep-17 14:34 06 16 25.81 +14 42 01.2 111.92 -202.99 7.74 16.18 1.0433249115 4.15592 0.4854762437 5.19877 80.7314 71.9311 1985-Sep-18 14:34 06 19 28.21 +13 21 16.3 109.27 -200.76 7.78 16.19 1.0458203591 4.47566 0.4885887509 5.57774 80.9504 71.5749 1985-Sep-19 14:34 06 22 25.27 +12 01 27.2 106.62 -198.35 7.81 16.20 1.0484994484 4.79189 0.4919163812 5.94364 81.1805 71.1996 1985-Sep-20 14:34 06 25 17.15 +10 42 38.0 103.98 -195.77 7.84 16.21 1.0513600872 5.10439 0.4954514145 6.29589 81.4211 70.8063 1985-Sep-21 14:34 06 28 04.01 +09 24 52.4 101.36 -193.05 7.88 16.22 1.0544000686 5.41299 0.4991858074 6.63396 81.6716 70.3963 1985-Sep-22 14:34 06 30 46.00 +08 08 13.6 98.74 -190.21 7.92 16.23 1.0576170785 5.71748 0.5031112496 6.95744 81.9315 69.9706 1985-Sep-23 14:34 06 33 23.27 +06 52 44.4 96.14 -187.26 7.96 16.24 1.0610087014 6.01771 0.5072192234 7.26603 82.2001 69.5306 1985-Sep-24 14:34 06 35 55.94 +05 38 26.9 93.55 -184.23 8.01 16.25 1.0645724276 6.31352 0.5115010659 7.55954 82.4770 69.0774 1985-Sep-25 14:34 06 38 24.14 +04 25 23.2 90.97 -181.12 8.05 16.26 1.0683056606 6.60477 0.5159480294 7.83785 82.7617 68.6122 1985-Sep-26 14:34 06 40 47.97 +03 13 34.6 88.41 -177.96 8.10 16.28 1.0722057234 6.89131 0.5205513359 8.10097 83.0536 68.1359 1985-Sep-27 14:34 06 43 07.55 +02 03 02.3 85.86 -174.77 8.14 16.29 1.0762698657 7.17303 0.5253022294 8.34898 83.3524 67.6498 1985-Sep-28 14:34 06 45 22.96 +00 53 47.0 83.33 -171.54 8.19 16.30 1.0804952715 7.44983 0.5301920242 8.58203 83.6577 67.1547 1985-Sep-29 14:34 06 47 34.29 -00 14 10.7 80.82 -168.30 8.24 16.32 1.0848790651 7.72160 0.5352121459 8.80035 83.9691 66.6518 1985-Sep-30 14:34 06 49 41.62 -01 20 50.6 78.32 -165.06 8.30 16.33 1.0894183183 7.98826 0.5403541693 9.00424 84.2862 66.1418 1985-Oct-01 14:34 06 51 45.01 -02 26 12.8 75.83 -161.82 8.35 16.35 1.0941100574 8.24973 0.5456098518 9.19402 84.6089 65.6256 1985-Oct-02 14:34 06 53 44.54 -03 30 17.4 73.36 -158.60 8.40 16.36 1.0989512694 8.50596 0.5509711594 9.37009 84.9367 65.1042 1985-Oct-03 14:34 06 55 40.26 -04 33 05.0 70.91 -155.40 8.46 16.38 1.1039389083 8.75689 0.5564302894 9.53286 85.2695 64.5782 1985-Oct-04 14:34 06 57 32.21 -05 34 36.1 68.47 -152.23 8.51 16.39 1.1090699017 9.00248 0.5619796896 9.68278 85.6070 64.0483 1985-Oct-05 14:34 06 59 20.45 -06 34 51.4 66.04 -149.09 8.57 16.41 1.1143411566 9.24271 0.5676120723 9.82032 85.9491 63.5153 1985-Oct-06 14:34 07 01 05.00 -07 33 51.9 63.63 -145.99 8.63 16.43 1.1197495649 9.47754 0.5733204266 9.94596 86.2956 62.9797 1985-Oct-07 14:34 07 02 45.91 -08 31 38.3 61.23 -142.93 8.69 16.44 1.1252920093 9.70696 0.5790980318 10.06022 86.6463 62.4422 ************************************************************************************************************************************************* 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