Ephemeris Generator
Ephemeris Settings
Target Body: *Comet 2P/Encke [0]*
Observer Location: *Geocentric [Code=500]*
Coordinates: *0 00'00.0''E, 0 00'00.0''N, -6378140. m*
From: *A.D. 1990-09-20 00:00 UT*
To: *A.D. 1990-10-02 00:00 *
Step: *12 hour*
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*
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HORIZONS Generated Ephemeris
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Ephemeris / WWW_USER Tue Mar 1 11:28:44 2005 Pasadena, USA / Horizons
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Target body name: 2P/Encke {source: JPL#J944/1}
Center body name: Earth (399) {source: DE-0406LE-0406}
Center-site name: GEOCENTRIC
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Start time : A.D. 1990-Sep-20 00:00:00.0000 UT
Stop time : A.D. 1990-Oct-02 00:00:00.0000 UT
Step-size : 720 minutes
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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 : 2.4 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
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.050225.p050519
EOP coverage : DATA-BASED 1962-JAN-20 TO 2005-FEB-25. PREDICTS-> 2005-MAY-18
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 )
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Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG):
EPOCH= 2450000.5 != 1995-Oct-10.0000000 (CT) Residual RMS= .83925
EC= .8500359691294602 QR= .3312840813841735 TP= 2450592.14980575
OM= 334.7301819289049 W= 186.2707671230575 IN= 11.93342990520284
Comet physical & dynamic parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days):
GM= n.a. RAD= 2.4 A1= -7.86279D-11
A2= -1.642865D-11 A3= n.a. DT= n.a.
M1= 9.8 M2= 14.5 k1= n.a.
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 /r S-T-O
****************************************************************************************************************************************************
1990-Sep-20 00:00 08 07 23.82 +33 23 21.2 291.62 -72.77 9.13 16.03 0.9398649602 -29.52093 0.8305343039 -12.92908 60.7452 /L 68.8114
1990-Sep-20 12:00 08 12 03.82 +33 08 23.8 293.64 -76.80 9.09 16.01 0.9313257069 -29.62213 0.8268960274 -12.27286 60.2159 /L 69.3750
1990-Sep-21 00:00 08 16 44.87 +32 52 37.8 295.56 -80.86 9.04 16.00 0.9227572468 -29.72340 0.8234490319 -11.60440 59.6767 /L 69.9404
1990-Sep-21 12:00 08 21 26.84 +32 36 03.0 297.35 -84.95 9.00 15.99 0.9141595656 -29.82471 0.8201968356 -10.92382 59.1279 /L 70.5073
1990-Sep-22 00:00 08 26 09.56 +32 18 38.9 299.03 -89.05 8.95 15.98 0.9055326639 -29.92598 0.8171429221 -10.23123 58.5697 /L 71.0750
1990-Sep-22 12:00 08 30 52.89 +32 00 25.5 300.59 -93.17 8.91 15.97 0.8968765581 -30.02718 0.8142907330 -9.52681 58.0023 /L 71.6432
1990-Sep-23 00:00 08 35 36.66 +31 41 22.8 302.01 -97.28 8.87 15.96 0.8881912823 -30.12822 0.8116436614 -8.81073 57.4261 /L 72.2112
1990-Sep-23 12:00 08 40 20.72 +31 21 30.8 303.31 -101.39 8.82 15.94 0.8794768894 -30.22905 0.8092050446 -8.08319 56.8412 /L 72.7784
1990-Sep-24 00:00 08 45 04.92 +31 00 49.6 304.48 -105.47 8.78 15.93 0.8707334531 -30.32959 0.8069781573 -7.34443 56.2480 /L 73.3443
1990-Sep-24 12:00 08 49 49.10 +30 39 19.5 305.51 -109.54 8.74 15.92 0.8619610696 -30.42976 0.8049662044 -6.59469 55.6469 /L 73.9082
1990-Sep-25 00:00 08 54 33.10 +30 17 00.8 306.41 -113.56 8.70 15.91 0.8531598594 -30.52948 0.8031723146 -5.83426 55.0381 /L 74.4694
1990-Sep-25 12:00 08 59 16.76 +29 53 54.1 307.16 -117.55 8.66 15.90 0.8443299697 -30.62863 0.8015995335 -5.06343 54.4219 /L 75.0273
1990-Sep-26 00:00 09 03 59.95 +29 29 59.9 307.78 -121.48 8.63 15.89 0.8354715764 -30.72713 0.8002508173 -4.28252 53.7989 /L 75.5810
1990-Sep-26 12:00 09 08 42.51 +29 05 18.9 308.26 -125.35 8.59 15.88 0.8265848871 -30.82485 0.7991290264 -3.49187 53.1694 /L 76.1298
1990-Sep-27 00:00 09 13 24.30 +28 39 51.9 308.60 -129.15 8.55 15.87 0.8176701433 -30.92168 0.7982369198 -2.69185 52.5337 /L 76.6730
1990-Sep-27 12:00 09 18 05.19 +28 13 39.7 308.80 -132.87 8.51 15.86 0.8087276235 -31.01748 0.7975771494 -1.88283 51.8923 /L 77.2096
1990-Sep-28 00:00 09 22 45.03 +27 46 43.5 308.87 -136.50 8.48 15.85 0.7997576469 -31.11211 0.7971522544 -1.06522 51.2455 /L 77.7388
1990-Sep-28 12:00 09 27 23.70 +27 19 04.1 308.80 -140.05 8.45 15.85 0.7907605765 -31.20540 0.7969646570 -0.23942 50.5940 /L 78.2597
1990-Sep-29 00:00 09 32 01.08 +26 50 42.8 308.60 -143.49 8.41 15.84 0.7817368225 -31.29719 0.7970166579 0.59414 49.9379 /L 78.7714
1990-Sep-29 12:00 09 36 37.06 +26 21 40.9 308.28 -146.83 8.38 15.83 0.7726868476 -31.38728 0.7973104318 1.43500 49.2779 /L 79.2729
1990-Sep-30 00:00 09 41 11.52 +25 51 59.5 307.83 -150.05 8.35 15.82 0.7636111706 -31.47548 0.7978480245 2.28273 48.6144 /L 79.7632
1990-Sep-30 12:00 09 45 44.37 +25 21 40.2 307.25 -153.16 8.32 15.81 0.7545103721 -31.56156 0.7986313493 3.13686 47.9478 /L 80.2413
1990-Oct-01 00:00 09 50 15.51 +24 50 44.4 306.57 -156.14 8.29 15.80 0.7453850988 -31.64528 0.7996621854 3.99691 47.2785 /L 80.7062
1990-Oct-01 12:00 09 54 44.85 +24 19 13.5 305.77 -159.00 8.26 15.79 0.7362360707 -31.72638 0.8009421746 4.86242 46.6071 /L 81.1567
1990-Oct-02 00:00 09 59 12.33 +23 47 09.0 304.86 -161.73 8.23 15.78 0.7270640872 -31.80457 0.8024728206 5.73290 45.9339 /L 81.5918
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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 =
SPECIAL CASE: Comet Encke's approximate apparent visual total magnitude
("T-mag") and nuclear magnitude ("N-mag") by following definitions:
T-mag = M1 + 5*log10(delta) + 2.5*(r**1.8 - 1) (NON-STANDARD)
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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