Ephemeris Generator
Ephemeris Settings
Target Body: *Comet C/Cernis (1983 O1 = 1983 O1) [1991.33]*
Observer Location: *Geocentric [Code=500]*
Coordinates: *0 00'00.0''E, 0 00'00.0''N, -6378140. m*
From: *A.D. 1983-09-07 00:00 UT*
To: *A.D. 1983-09-09 00:00 *
Step: *30 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 Thu Feb 24 05:17:03 2005 Pasadena, USA / Horizons
*******************************************************************************
Target body name: Cernis (C/1983 O1) {source: JPL#1}
Center body name: Earth (399) {source: DE-0406LE-0406}
Center-site name: GEOCENTRIC
*******************************************************************************
Start time : A.D. 1983-Sep-07 00:00:00.0000 UT
Stop time : A.D. 1983-Sep-09 00:00:00.0000 UT
Step-size : 30 minutes
*******************************************************************************
Center geodetic : 0.000000, 0.0000, 0.0000{E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 0.000000, 0.0000, 0.0000{E-lon(deg),Dxy(km),Dz(km)}
Center pole/equ : High-precision EOP 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
Small perturbers: Ceres, Pallas, Vesta {source: SB405-CPV-2}
Small body GMs : 6.32E+01, 1.43E+01, 1.78E+01 km^3/s^2
Atmos refraction: NO (AIRLESS)
RA format : HMS
Time format : CAL
EOP file : eop.050222.p050511
EOP coverage : DATA-BASED 1962-JAN-20 TO 2005-FEB-22. PREDICTS-> 2005-MAY-10
Units conversion: 1 AU= 149597870.691 km, c= 299792.458 km/s, 1 day= 86400.0 s
Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )
Table cut-offs 2: Solar Elongation ( 0.0,180.0=NO )
*******************************************************************************
Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG):
EPOCH= 2448400.5 != 1991-May-24.0000000 (CT) Residual RMS= 1.0383
EC= 1.001727315607581 QR= 3.329080709101806 TP= 2445538.198966445
OM= 209.6981867990802 W= 186.493582655695 IN= 134.6082666202658
Comet physical & dynamic parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days):
GM= n.a. RAD= n.a. A1= n.a.
A2= n.a. A3= n.a. DT= n.a.
M1= n.a. M2= n.a. k1= n.a.
k2= n.a. 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 /r S-T-O
****************************************************************************************************************************************************
1983-Sep-07 00:00 02 13 12.39 -03 19 20.3 -51.03 -64.59 n.a. n.a. 3.3484377389 2.19890 2.5903486791 -20.49435 131.8784 /L 12.9506
1983-Sep-07 00:30 02 13 10.68 -03 19 52.6 -51.06 -64.60 n.a. n.a. 3.3484642252 2.19984 2.5901022097 -20.47965 131.9051 /L 12.9449
1983-Sep-07 01:00 02 13 08.98 -03 20 24.9 -51.08 -64.61 n.a. n.a. 3.3484907227 2.20077 2.5898559174 -20.46493 131.9319 /L 12.9392
1983-Sep-07 01:30 02 13 07.27 -03 20 57.3 -51.11 -64.63 n.a. n.a. 3.3485172315 2.20171 2.5896098023 -20.45020 131.9586 /L 12.9335
1983-Sep-07 02:00 02 13 05.57 -03 21 29.6 -51.13 -64.64 n.a. n.a. 3.3485437516 2.20265 2.5893638645 -20.43547 131.9854 /L 12.9278
1983-Sep-07 02:30 02 13 03.86 -03 22 01.9 -51.16 -64.65 n.a. n.a. 3.3485702829 2.20358 2.5891181039 -20.42073 132.0121 /L 12.9222
1983-Sep-07 03:00 02 13 02.15 -03 22 34.2 -51.18 -64.67 n.a. n.a. 3.3485968255 2.20452 2.5888725209 -20.40598 132.0389 /L 12.9164
1983-Sep-07 03:30 02 13 00.44 -03 23 06.6 -51.21 -64.68 n.a. n.a. 3.3486233794 2.20546 2.5886271154 -20.39122 132.0656 /L 12.9107
1983-Sep-07 04:00 02 12 58.73 -03 23 38.9 -51.23 -64.69 n.a. n.a. 3.3486499445 2.20639 2.5883818876 -20.37645 132.0924 /L 12.9050
1983-Sep-07 04:30 02 12 57.02 -03 24 11.2 -51.26 -64.70 n.a. n.a. 3.3486765209 2.20733 2.5881368376 -20.36167 132.1191 /L 12.8993
1983-Sep-07 05:00 02 12 55.31 -03 24 43.6 -51.28 -64.72 n.a. n.a. 3.3487031086 2.20826 2.5878919654 -20.34689 132.1459 /L 12.8936
1983-Sep-07 05:30 02 12 53.60 -03 25 16.0 -51.31 -64.73 n.a. n.a. 3.3487297075 2.20920 2.5876472713 -20.33209 132.1726 /L 12.8879
1983-Sep-07 06:00 02 12 51.88 -03 25 48.3 -51.33 -64.74 n.a. n.a. 3.3487563177 2.21014 2.5874027552 -20.31729 132.1994 /L 12.8822
1983-Sep-07 06:30 02 12 50.17 -03 26 20.7 -51.36 -64.76 n.a. n.a. 3.3487829392 2.21107 2.5871584172 -20.30248 132.2261 /L 12.8765
1983-Sep-07 07:00 02 12 48.45 -03 26 53.1 -51.38 -64.77 n.a. n.a. 3.3488095719 2.21201 2.5869142576 -20.28766 132.2528 /L 12.8708
1983-Sep-07 07:30 02 12 46.74 -03 27 25.5 -51.40 -64.78 n.a. n.a. 3.3488362158 2.21294 2.5866702763 -20.27284 132.2796 /L 12.8650
1983-Sep-07 08:00 02 12 45.02 -03 27 57.9 -51.43 -64.80 n.a. n.a. 3.3488628711 2.21388 2.5864264736 -20.25800 132.3063 /L 12.8593
1983-Sep-07 08:30 02 12 43.30 -03 28 30.3 -51.45 -64.81 n.a. n.a. 3.3488895376 2.21482 2.5861828494 -20.24316 132.3331 /L 12.8536
1983-Sep-07 09:00 02 12 41.59 -03 29 02.7 -51.48 -64.82 n.a. n.a. 3.3489162153 2.21575 2.5859394039 -20.22830 132.3598 /L 12.8478
1983-Sep-07 09:30 02 12 39.87 -03 29 35.1 -51.50 -64.84 n.a. n.a. 3.3489429043 2.21669 2.5856961372 -20.21344 132.3865 /L 12.8421
1983-Sep-07 10:00 02 12 38.15 -03 30 07.5 -51.53 -64.85 n.a. n.a. 3.3489696046 2.21762 2.5854530495 -20.19857 132.4133 /L 12.8364
1983-Sep-07 10:30 02 12 36.43 -03 30 39.9 -51.55 -64.86 n.a. n.a. 3.3489963162 2.21856 2.5852101407 -20.18369 132.4400 /L 12.8306
1983-Sep-07 11:00 02 12 34.70 -03 31 12.4 -51.58 -64.88 n.a. n.a. 3.3490230390 2.21950 2.5849674110 -20.16881 132.4667 /L 12.8249
1983-Sep-07 11:30 02 12 32.98 -03 31 44.8 -51.60 -64.89 n.a. n.a. 3.3490497730 2.22043 2.5847248605 -20.15391 132.4935 /L 12.8192
1983-Sep-07 12:00 02 12 31.26 -03 32 17.3 -51.63 -64.90 n.a. n.a. 3.3490765183 2.22137 2.5844824893 -20.13901 132.5202 /L 12.8134
1983-Sep-07 12:30 02 12 29.53 -03 32 49.7 -51.65 -64.92 n.a. n.a. 3.3491032749 2.22230 2.5842402975 -20.12409 132.5469 /L 12.8077
1983-Sep-07 13:00 02 12 27.81 -03 33 22.2 -51.68 -64.93 n.a. n.a. 3.3491300427 2.22324 2.5839982852 -20.10917 132.5736 /L 12.8019
1983-Sep-07 13:30 02 12 26.08 -03 33 54.6 -51.70 -64.94 n.a. n.a. 3.3491568218 2.22418 2.5837564526 -20.09424 132.6004 /L 12.7962
1983-Sep-07 14:00 02 12 24.36 -03 34 27.1 -51.73 -64.95 n.a. n.a. 3.3491836122 2.22511 2.5835147996 -20.07931 132.6271 /L 12.7904
1983-Sep-07 14:30 02 12 22.63 -03 34 59.6 -51.75 -64.97 n.a. n.a. 3.3492104138 2.22605 2.5832733265 -20.06436 132.6538 /L 12.7847
1983-Sep-07 15:00 02 12 20.90 -03 35 32.1 -51.77 -64.98 n.a. n.a. 3.3492372267 2.22698 2.5830320332 -20.04941 132.6805 /L 12.7789
1983-Sep-07 15:30 02 12 19.17 -03 36 04.6 -51.80 -64.99 n.a. n.a. 3.3492640508 2.22792 2.5827909200 -20.03444 132.7072 /L 12.7731
1983-Sep-07 16:00 02 12 17.44 -03 36 37.1 -51.82 -65.01 n.a. n.a. 3.3492908861 2.22885 2.5825499869 -20.01947 132.7340 /L 12.7674
1983-Sep-07 16:30 02 12 15.71 -03 37 09.6 -51.85 -65.02 n.a. n.a. 3.3493177328 2.22979 2.5823092340 -20.00449 132.7607 /L 12.7616
1983-Sep-07 17:00 02 12 13.98 -03 37 42.1 -51.87 -65.03 n.a. n.a. 3.3493445907 2.23072 2.5820686615 -19.98950 132.7874 /L 12.7558
1983-Sep-07 17:30 02 12 12.24 -03 38 14.6 -51.90 -65.05 n.a. n.a. 3.3493714598 2.23166 2.5818282693 -19.97451 132.8141 /L 12.7501
1983-Sep-07 18:00 02 12 10.51 -03 38 47.1 -51.92 -65.06 n.a. n.a. 3.3493983402 2.23259 2.5815880577 -19.95950 132.8408 /L 12.7443
1983-Sep-07 18:30 02 12 08.78 -03 39 19.7 -51.95 -65.07 n.a. n.a. 3.3494252318 2.23353 2.5813480267 -19.94449 132.8675 /L 12.7385
1983-Sep-07 19:00 02 12 07.04 -03 39 52.2 -51.97 -65.08 n.a. n.a. 3.3494521347 2.23447 2.5811081764 -19.92947 132.8942 /L 12.7328
1983-Sep-07 19:30 02 12 05.31 -03 40 24.7 -52.00 -65.10 n.a. n.a. 3.3494790489 2.23540 2.5808685069 -19.91444 132.9209 /L 12.7270
1983-Sep-07 20:00 02 12 03.57 -03 40 57.3 -52.02 -65.11 n.a. n.a. 3.3495059743 2.23634 2.5806290184 -19.89940 132.9477 /L 12.7212
1983-Sep-07 20:30 02 12 01.83 -03 41 29.8 -52.05 -65.12 n.a. n.a. 3.3495329110 2.23727 2.5803897109 -19.88435 132.9744 /L 12.7154
1983-Sep-07 21:00 02 12 00.09 -03 42 02.4 -52.07 -65.14 n.a. n.a. 3.3495598589 2.23821 2.5801505845 -19.86930 133.0011 /L 12.7096
1983-Sep-07 21:30 02 11 58.35 -03 42 35.0 -52.09 -65.15 n.a. n.a. 3.3495868180 2.23914 2.5799116393 -19.85424 133.0278 /L 12.7038
1983-Sep-07 22:00 02 11 56.61 -03 43 07.6 -52.12 -65.16 n.a. n.a. 3.3496137885 2.24008 2.5796728755 -19.83916 133.0545 /L 12.6980
1983-Sep-07 22:30 02 11 54.87 -03 43 40.1 -52.14 -65.17 n.a. n.a. 3.3496407701 2.24101 2.5794342930 -19.82408 133.0812 /L 12.6923
1983-Sep-07 23:00 02 11 53.13 -03 44 12.7 -52.17 -65.19 n.a. n.a. 3.3496677630 2.24195 2.5791958922 -19.80899 133.1079 /L 12.6865
1983-Sep-07 23:30 02 11 51.39 -03 44 45.3 -52.19 -65.20 n.a. n.a. 3.3496947672 2.24288 2.5789576729 -19.79390 133.1346 /L 12.6807
1983-Sep-08 00:00 02 11 49.64 -03 45 17.9 -52.22 -65.21 n.a. n.a. 3.3497217826 2.24382 2.5787196354 -19.77879 133.1613 /L 12.6749
1983-Sep-08 00:30 02 11 47.90 -03 45 50.5 -52.24 -65.23 n.a. n.a. 3.3497488093 2.24475 2.5784817797 -19.76368 133.1879 /L 12.6691
1983-Sep-08 01:00 02 11 46.15 -03 46 23.2 -52.27 -65.24 n.a. n.a. 3.3497758472 2.24569 2.5782441059 -19.74856 133.2146 /L 12.6633
1983-Sep-08 01:30 02 11 44.41 -03 46 55.8 -52.29 -65.25 n.a. n.a. 3.3498028964 2.24662 2.5780066142 -19.73343 133.2413 /L 12.6575
1983-Sep-08 02:00 02 11 42.66 -03 47 28.4 -52.32 -65.26 n.a. n.a. 3.3498299568 2.24756 2.5777693045 -19.71829 133.2680 /L 12.6516
1983-Sep-08 02:30 02 11 40.91 -03 48 01.0 -52.34 -65.28 n.a. n.a. 3.3498570285 2.24849 2.5775321771 -19.70314 133.2947 /L 12.6458
1983-Sep-08 03:00 02 11 39.16 -03 48 33.7 -52.37 -65.29 n.a. n.a. 3.3498841114 2.24943 2.5772952321 -19.68799 133.3214 /L 12.6400
1983-Sep-08 03:30 02 11 37.42 -03 49 06.3 -52.39 -65.30 n.a. n.a. 3.3499112055 2.25036 2.5770584695 -19.67282 133.3481 /L 12.6342
1983-Sep-08 04:00 02 11 35.66 -03 49 39.0 -52.41 -65.31 n.a. n.a. 3.3499383109 2.25130 2.5768218894 -19.65765 133.3748 /L 12.6284
1983-Sep-08 04:30 02 11 33.91 -03 50 11.6 -52.44 -65.33 n.a. n.a. 3.3499654276 2.25223 2.5765854919 -19.64247 133.4014 /L 12.6226
1983-Sep-08 05:00 02 11 32.16 -03 50 44.3 -52.46 -65.34 n.a. n.a. 3.3499925555 2.25317 2.5763492771 -19.62728 133.4281 /L 12.6167
1983-Sep-08 05:30 02 11 30.41 -03 51 17.0 -52.49 -65.35 n.a. n.a. 3.3500196946 2.25410 2.5761132452 -19.61209 133.4548 /L 12.6109
1983-Sep-08 06:00 02 11 28.66 -03 51 49.7 -52.51 -65.37 n.a. n.a. 3.3500468450 2.25504 2.5758773962 -19.59688 133.4815 /L 12.6051
1983-Sep-08 06:30 02 11 26.90 -03 52 22.3 -52.54 -65.38 n.a. n.a. 3.3500740066 2.25597 2.5756417302 -19.58167 133.5081 /L 12.5993
1983-Sep-08 07:00 02 11 25.15 -03 52 55.0 -52.56 -65.39 n.a. n.a. 3.3501011795 2.25691 2.5754062474 -19.56645 133.5348 /L 12.5934
1983-Sep-08 07:30 02 11 23.39 -03 53 27.7 -52.59 -65.40 n.a. n.a. 3.3501283636 2.25784 2.5751709478 -19.55122 133.5615 /L 12.5876
1983-Sep-08 08:00 02 11 21.63 -03 54 00.4 -52.61 -65.42 n.a. n.a. 3.3501555590 2.25877 2.5749358315 -19.53598 133.5882 /L 12.5818
1983-Sep-08 08:30 02 11 19.87 -03 54 33.1 -52.63 -65.43 n.a. n.a. 3.3501827656 2.25971 2.5747008986 -19.52073 133.6148 /L 12.5759
1983-Sep-08 09:00 02 11 18.12 -03 55 05.9 -52.66 -65.44 n.a. n.a. 3.3502099835 2.26064 2.5744661493 -19.50548 133.6415 /L 12.5701
1983-Sep-08 09:30 02 11 16.36 -03 55 38.6 -52.68 -65.45 n.a. n.a. 3.3502372126 2.26158 2.5742315836 -19.49022 133.6681 /L 12.5643
1983-Sep-08 10:00 02 11 14.60 -03 56 11.3 -52.71 -65.47 n.a. n.a. 3.3502644529 2.26251 2.5739972016 -19.47495 133.6948 /L 12.5584
1983-Sep-08 10:30 02 11 12.84 -03 56 44.0 -52.73 -65.48 n.a. n.a. 3.3502917045 2.26345 2.5737630034 -19.45967 133.7215 /L 12.5526
1983-Sep-08 11:00 02 11 11.07 -03 57 16.8 -52.76 -65.49 n.a. n.a. 3.3503189673 2.26438 2.5735289891 -19.44438 133.7481 /L 12.5467
1983-Sep-08 11:30 02 11 09.31 -03 57 49.5 -52.78 -65.50 n.a. n.a. 3.3503462414 2.26532 2.5732951589 -19.42908 133.7748 /L 12.5409
1983-Sep-08 12:00 02 11 07.55 -03 58 22.3 -52.81 -65.52 n.a. n.a. 3.3503735267 2.26625 2.5730615128 -19.41378 133.8014 /L 12.5350
1983-Sep-08 12:30 02 11 05.78 -03 58 55.1 -52.83 -65.53 n.a. n.a. 3.3504008233 2.26718 2.5728280509 -19.39847 133.8281 /L 12.5292
1983-Sep-08 13:00 02 11 04.02 -03 59 27.8 -52.85 -65.54 n.a. n.a. 3.3504281310 2.26812 2.5725947733 -19.38315 133.8547 /L 12.5233
1983-Sep-08 13:30 02 11 02.25 -04 00 00.6 -52.88 -65.55 n.a. n.a. 3.3504554501 2.26905 2.5723616801 -19.36782 133.8814 /L 12.5174
1983-Sep-08 14:00 02 11 00.48 -04 00 33.4 -52.90 -65.57 n.a. n.a. 3.3504827803 2.26999 2.5721287714 -19.35248 133.9080 /L 12.5116
1983-Sep-08 14:30 02 10 58.72 -04 01 06.2 -52.93 -65.58 n.a. n.a. 3.3505101218 2.27092 2.5718960473 -19.33714 133.9347 /L 12.5057
1983-Sep-08 15:00 02 10 56.95 -04 01 38.9 -52.95 -65.59 n.a. n.a. 3.3505374746 2.27185 2.5716635080 -19.32179 133.9613 /L 12.4999
1983-Sep-08 15:30 02 10 55.18 -04 02 11.7 -52.98 -65.60 n.a. n.a. 3.3505648386 2.27279 2.5714311535 -19.30642 133.9880 /L 12.4940
1983-Sep-08 16:00 02 10 53.41 -04 02 44.5 -53.00 -65.62 n.a. n.a. 3.3505922138 2.27372 2.5711989838 -19.29105 134.0146 /L 12.4881
1983-Sep-08 16:30 02 10 51.64 -04 03 17.4 -53.03 -65.63 n.a. n.a. 3.3506196003 2.27466 2.5709669992 -19.27568 134.0412 /L 12.4822
1983-Sep-08 17:00 02 10 49.86 -04 03 50.2 -53.05 -65.64 n.a. n.a. 3.3506469980 2.27559 2.5707351997 -19.26029 134.0679 /L 12.4764
1983-Sep-08 17:30 02 10 48.09 -04 04 23.0 -53.07 -65.65 n.a. n.a. 3.3506744069 2.27653 2.5705035853 -19.24490 134.0945 /L 12.4705
1983-Sep-08 18:00 02 10 46.32 -04 04 55.8 -53.10 -65.66 n.a. n.a. 3.3507018271 2.27746 2.5702721563 -19.22950 134.1211 /L 12.4646
1983-Sep-08 18:30 02 10 44.54 -04 05 28.7 -53.12 -65.68 n.a. n.a. 3.3507292585 2.27839 2.5700409127 -19.21409 134.1478 /L 12.4587
1983-Sep-08 19:00 02 10 42.77 -04 06 01.5 -53.15 -65.69 n.a. n.a. 3.3507567011 2.27933 2.5698098545 -19.19867 134.1744 /L 12.4529
1983-Sep-08 19:30 02 10 40.99 -04 06 34.4 -53.17 -65.70 n.a. n.a. 3.3507841550 2.28026 2.5695789820 -19.18324 134.2010 /L 12.4470
1983-Sep-08 20:00 02 10 39.21 -04 07 07.2 -53.20 -65.71 n.a. n.a. 3.3508116201 2.28119 2.5693482951 -19.16781 134.2276 /L 12.4411
1983-Sep-08 20:30 02 10 37.44 -04 07 40.1 -53.22 -65.73 n.a. n.a. 3.3508390965 2.28213 2.5691177940 -19.15236 134.2543 /L 12.4352
1983-Sep-08 21:00 02 10 35.66 -04 08 12.9 -53.24 -65.74 n.a. n.a. 3.3508665840 2.28306 2.5688874788 -19.13691 134.2809 /L 12.4293
1983-Sep-08 21:30 02 10 33.88 -04 08 45.8 -53.27 -65.75 n.a. n.a. 3.3508940829 2.28400 2.5686573496 -19.12146 134.3075 /L 12.4234
1983-Sep-08 22:00 02 10 32.10 -04 09 18.7 -53.29 -65.76 n.a. n.a. 3.3509215929 2.28493 2.5684274065 -19.10599 134.3341 /L 12.4175
1983-Sep-08 22:30 02 10 30.32 -04 09 51.6 -53.32 -65.77 n.a. n.a. 3.3509491142 2.28586 2.5681976496 -19.09051 134.3607 /L 12.4116
1983-Sep-08 23:00 02 10 28.53 -04 10 24.5 -53.34 -65.79 n.a. n.a. 3.3509766467 2.28680 2.5679680789 -19.07503 134.3873 /L 12.4057
1983-Sep-08 23:30 02 10 26.75 -04 10 57.4 -53.37 -65.80 n.a. n.a. 3.3510041905 2.28773 2.5677386946 -19.05954 134.4139 /L 12.3998
1983-Sep-09 00:00 02 10 24.97 -04 11 30.3 -53.39 -65.81 n.a. n.a. 3.3510317455 2.28866 2.5675094968 -19.04404 134.4406 /L 12.3939
****************************************************************************************************************************************************
Column meaning:
TIME
Prior to 1962, 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 uniform Coordinate Time scale is used internally. Conversion between
CT 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 /r =
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. Angular units: DEGREES.
The '/r' column is a Sun-relative code, output for observing sites
with defined rotation models only.
/T indicates target trails Sun (evening sky)
/L indicates target leads Sun (morning sky)
NOTE: The S-O-T solar elongation angle is the total separation in any
direction. It does not indicate the angle of Sun leading or trailing.
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 (via browser)
telnet ssd.jpl.nasa.gov 6775 (via command-line)
Author : Jon.Giorgini@jpl.nasa.gov
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