Ephemeris Generator
Ephemeris Settings
Target Body: *Comet 29P/Schwassmann-Wachmann 1 [0]*
Observer Location: *Geocentric [Code=500]*
Coordinates: *0 00'00.0''E, 0 00'00.0''N, -6378140. m*
From: *A.D. 1987-10-23 16:00 UT*
To: *A.D. 1987-10-23 17:00 *
Step: *1 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*
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HORIZONS Generated Ephemeris
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Ephemeris / WWW_USER Tue Mar 1 11:07:20 2005 Pasadena, USA / Horizons
*******************************************************************************
Target body name: 29P/Schwassmann-Wachmann 1 {source: JPL#J896/2}
Center body name: Earth (399) {source: DE-0406LE-0406}
Center-site name: GEOCENTRIC
*******************************************************************************
Start time : A.D. 1987-Oct-23 16:00:00.0000 UT
Stop time : A.D. 1987-Oct-23 17:00:00.0000 UT
Step-size : 1 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 : 15.0 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 )
*******************************************************************************
Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG):
EPOCH= 2442080.5 != 1974-Feb-02.0000000 (CT) Residual RMS= .94873
EC= .1054282056184584 QR= 5.447853577050036 TP= 2442093.822099044
OM= 320.3566972775236 W= 14.44544861187592 IN= 9.752211212320441
Comet physical & dynamic parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days):
GM= n.a. RAD= 15. A1= n.a.
A2= n.a. A3= n.a. DT= n.a.
M1= 4. M2= n.a. k1= 7.5
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
****************************************************************************************************************************************************
1987-Oct-23 16:00 20 09 32.43 -20 35 35.5 9.94 4.15 13.57 n.a. 5.8704565872 -0.43278 5.7789731823 27.43640 90.3838 /T 9.7549
1987-Oct-23 16:01 20 09 32.44 -20 35 35.5 9.94 4.15 13.57 n.a. 5.8704564139 -0.43278 5.7789841865 27.43640 90.3831 /T 9.7549
1987-Oct-23 16:02 20 09 32.45 -20 35 35.4 9.94 4.15 13.57 n.a. 5.8704562405 -0.43277 5.7789951906 27.43641 90.3825 /T 9.7549
1987-Oct-23 16:03 20 09 32.47 -20 35 35.3 9.94 4.15 13.57 n.a. 5.8704560672 -0.43277 5.7790061948 27.43641 90.3819 /T 9.7549
1987-Oct-23 16:04 20 09 32.48 -20 35 35.3 9.94 4.15 13.57 n.a. 5.8704558938 -0.43277 5.7790171989 27.43641 90.3812 /T 9.7549
1987-Oct-23 16:05 20 09 32.49 -20 35 35.2 9.94 4.15 13.57 n.a. 5.8704557205 -0.43277 5.7790282031 27.43641 90.3806 /T 9.7549
1987-Oct-23 16:06 20 09 32.50 -20 35 35.1 9.94 4.15 13.57 n.a. 5.8704555471 -0.43277 5.7790392073 27.43642 90.3799 /T 9.7549
1987-Oct-23 16:07 20 09 32.51 -20 35 35.1 9.94 4.15 13.57 n.a. 5.8704553738 -0.43277 5.7790502114 27.43642 90.3793 /T 9.7549
1987-Oct-23 16:08 20 09 32.52 -20 35 35.0 9.94 4.15 13.57 n.a. 5.8704552004 -0.43277 5.7790612156 27.43642 90.3786 /T 9.7549
1987-Oct-23 16:09 20 09 32.54 -20 35 34.9 9.94 4.15 13.57 n.a. 5.8704550271 -0.43277 5.7790722198 27.43642 90.3780 /T 9.7549
1987-Oct-23 16:10 20 09 32.55 -20 35 34.9 9.94 4.15 13.57 n.a. 5.8704548537 -0.43277 5.7790832239 27.43643 90.3774 /T 9.7549
1987-Oct-23 16:11 20 09 32.56 -20 35 34.8 9.94 4.15 13.57 n.a. 5.8704546804 -0.43277 5.7790942281 27.43643 90.3767 /T 9.7549
1987-Oct-23 16:12 20 09 32.57 -20 35 34.7 9.94 4.15 13.57 n.a. 5.8704545070 -0.43277 5.7791052323 27.43643 90.3761 /T 9.7549
1987-Oct-23 16:13 20 09 32.58 -20 35 34.6 9.94 4.15 13.57 n.a. 5.8704543337 -0.43277 5.7791162365 27.43643 90.3754 /T 9.7549
1987-Oct-23 16:14 20 09 32.60 -20 35 34.6 9.94 4.15 13.57 n.a. 5.8704541603 -0.43277 5.7791272406 27.43644 90.3748 /T 9.7549
1987-Oct-23 16:15 20 09 32.61 -20 35 34.5 9.94 4.15 13.57 n.a. 5.8704539870 -0.43277 5.7791382448 27.43644 90.3741 /T 9.7549
1987-Oct-23 16:16 20 09 32.62 -20 35 34.4 9.94 4.15 13.57 n.a. 5.8704538136 -0.43277 5.7791492490 27.43644 90.3735 /T 9.7549
1987-Oct-23 16:17 20 09 32.63 -20 35 34.4 9.94 4.15 13.57 n.a. 5.8704536403 -0.43277 5.7791602531 27.43645 90.3729 /T 9.7549
1987-Oct-23 16:18 20 09 32.64 -20 35 34.3 9.94 4.15 13.57 n.a. 5.8704534669 -0.43277 5.7791712573 27.43645 90.3722 /T 9.7549
1987-Oct-23 16:19 20 09 32.65 -20 35 34.2 9.94 4.15 13.57 n.a. 5.8704532936 -0.43277 5.7791822615 27.43645 90.3716 /T 9.7549
1987-Oct-23 16:20 20 09 32.67 -20 35 34.2 9.94 4.15 13.57 n.a. 5.8704531202 -0.43277 5.7791932657 27.43645 90.3709 /T 9.7549
1987-Oct-23 16:21 20 09 32.68 -20 35 34.1 9.94 4.15 13.57 n.a. 5.8704529469 -0.43277 5.7792042699 27.43646 90.3703 /T 9.7549
1987-Oct-23 16:22 20 09 32.69 -20 35 34.0 9.95 4.15 13.57 n.a. 5.8704527735 -0.43277 5.7792152740 27.43646 90.3696 /T 9.7549
1987-Oct-23 16:23 20 09 32.70 -20 35 34.0 9.95 4.15 13.57 n.a. 5.8704526002 -0.43277 5.7792262782 27.43646 90.3690 /T 9.7549
1987-Oct-23 16:24 20 09 32.71 -20 35 33.9 9.95 4.15 13.57 n.a. 5.8704524268 -0.43277 5.7792372824 27.43646 90.3684 /T 9.7549
1987-Oct-23 16:25 20 09 32.73 -20 35 33.8 9.95 4.15 13.57 n.a. 5.8704522535 -0.43277 5.7792482866 27.43647 90.3677 /T 9.7549
1987-Oct-23 16:26 20 09 32.74 -20 35 33.7 9.95 4.15 13.57 n.a. 5.8704520801 -0.43277 5.7792592908 27.43647 90.3671 /T 9.7549
1987-Oct-23 16:27 20 09 32.75 -20 35 33.7 9.95 4.15 13.57 n.a. 5.8704519068 -0.43277 5.7792702950 27.43647 90.3664 /T 9.7549
1987-Oct-23 16:28 20 09 32.76 -20 35 33.6 9.95 4.15 13.57 n.a. 5.8704517334 -0.43277 5.7792812992 27.43647 90.3658 /T 9.7549
1987-Oct-23 16:29 20 09 32.77 -20 35 33.5 9.95 4.15 13.57 n.a. 5.8704515601 -0.43277 5.7792923033 27.43648 90.3652 /T 9.7549
1987-Oct-23 16:30 20 09 32.78 -20 35 33.5 9.95 4.15 13.57 n.a. 5.8704513867 -0.43277 5.7793033075 27.43648 90.3645 /T 9.7549
1987-Oct-23 16:31 20 09 32.80 -20 35 33.4 9.95 4.15 13.57 n.a. 5.8704512134 -0.43277 5.7793143117 27.43648 90.3639 /T 9.7549
1987-Oct-23 16:32 20 09 32.81 -20 35 33.3 9.95 4.15 13.57 n.a. 5.8704510400 -0.43277 5.7793253159 27.43648 90.3632 /T 9.7549
1987-Oct-23 16:33 20 09 32.82 -20 35 33.3 9.95 4.15 13.57 n.a. 5.8704508667 -0.43277 5.7793363201 27.43649 90.3626 /T 9.7549
1987-Oct-23 16:34 20 09 32.83 -20 35 33.2 9.95 4.15 13.57 n.a. 5.8704506933 -0.43277 5.7793473243 27.43649 90.3619 /T 9.7549
1987-Oct-23 16:35 20 09 32.84 -20 35 33.1 9.95 4.15 13.57 n.a. 5.8704505200 -0.43277 5.7793583285 27.43649 90.3613 /T 9.7549
1987-Oct-23 16:36 20 09 32.85 -20 35 33.1 9.95 4.15 13.57 n.a. 5.8704503467 -0.43277 5.7793693327 27.43649 90.3607 /T 9.7549
1987-Oct-23 16:37 20 09 32.87 -20 35 33.0 9.95 4.15 13.57 n.a. 5.8704501733 -0.43276 5.7793803369 27.43650 90.3600 /T 9.7549
1987-Oct-23 16:38 20 09 32.88 -20 35 32.9 9.95 4.15 13.57 n.a. 5.8704500000 -0.43276 5.7793913411 27.43650 90.3594 /T 9.7549
1987-Oct-23 16:39 20 09 32.89 -20 35 32.8 9.95 4.15 13.57 n.a. 5.8704498266 -0.43276 5.7794023453 27.43650 90.3587 /T 9.7549
1987-Oct-23 16:40 20 09 32.90 -20 35 32.8 9.95 4.15 13.57 n.a. 5.8704496533 -0.43276 5.7794133495 27.43650 90.3581 /T 9.7549
1987-Oct-23 16:41 20 09 32.91 -20 35 32.7 9.95 4.15 13.57 n.a. 5.8704494799 -0.43276 5.7794243537 27.43651 90.3574 /T 9.7549
1987-Oct-23 16:42 20 09 32.93 -20 35 32.6 9.95 4.15 13.57 n.a. 5.8704493066 -0.43276 5.7794353579 27.43651 90.3568 /T 9.7549
1987-Oct-23 16:43 20 09 32.94 -20 35 32.6 9.95 4.15 13.57 n.a. 5.8704491332 -0.43276 5.7794463621 27.43651 90.3562 /T 9.7549
1987-Oct-23 16:44 20 09 32.95 -20 35 32.5 9.95 4.15 13.57 n.a. 5.8704489599 -0.43276 5.7794573663 27.43651 90.3555 /T 9.7549
1987-Oct-23 16:45 20 09 32.96 -20 35 32.4 9.95 4.15 13.57 n.a. 5.8704487865 -0.43276 5.7794683705 27.43652 90.3549 /T 9.7549
1987-Oct-23 16:46 20 09 32.97 -20 35 32.4 9.95 4.15 13.57 n.a. 5.8704486132 -0.43276 5.7794793747 27.43652 90.3542 /T 9.7549
1987-Oct-23 16:47 20 09 32.98 -20 35 32.3 9.95 4.15 13.57 n.a. 5.8704484398 -0.43276 5.7794903789 27.43652 90.3536 /T 9.7549
1987-Oct-23 16:48 20 09 33.00 -20 35 32.2 9.95 4.15 13.57 n.a. 5.8704482665 -0.43276 5.7795013831 27.43652 90.3529 /T 9.7549
1987-Oct-23 16:49 20 09 33.01 -20 35 32.2 9.95 4.15 13.57 n.a. 5.8704480931 -0.43276 5.7795123873 27.43653 90.3523 /T 9.7549
1987-Oct-23 16:50 20 09 33.02 -20 35 32.1 9.95 4.15 13.57 n.a. 5.8704479198 -0.43276 5.7795233915 27.43653 90.3517 /T 9.7549
1987-Oct-23 16:51 20 09 33.03 -20 35 32.0 9.95 4.15 13.57 n.a. 5.8704477465 -0.43276 5.7795343957 27.43653 90.3510 /T 9.7549
1987-Oct-23 16:52 20 09 33.04 -20 35 31.9 9.95 4.15 13.57 n.a. 5.8704475731 -0.43276 5.7795454000 27.43654 90.3504 /T 9.7549
1987-Oct-23 16:53 20 09 33.06 -20 35 31.9 9.95 4.15 13.57 n.a. 5.8704473998 -0.43276 5.7795564042 27.43654 90.3497 /T 9.7549
1987-Oct-23 16:54 20 09 33.07 -20 35 31.8 9.95 4.15 13.57 n.a. 5.8704472264 -0.43276 5.7795674084 27.43654 90.3491 /T 9.7549
1987-Oct-23 16:55 20 09 33.08 -20 35 31.7 9.95 4.15 13.57 n.a. 5.8704470531 -0.43276 5.7795784126 27.43654 90.3484 /T 9.7549
1987-Oct-23 16:56 20 09 33.09 -20 35 31.7 9.95 4.15 13.57 n.a. 5.8704468797 -0.43276 5.7795894168 27.43654 90.3478 /T 9.7549
1987-Oct-23 16:57 20 09 33.10 -20 35 31.6 9.95 4.15 13.57 n.a. 5.8704467064 -0.43276 5.7796004210 27.43655 90.3472 /T 9.7548
1987-Oct-23 16:58 20 09 33.11 -20 35 31.5 9.95 4.15 13.57 n.a. 5.8704465330 -0.43276 5.7796114252 27.43655 90.3465 /T 9.7548
1987-Oct-23 16:59 20 09 33.13 -20 35 31.5 9.95 4.15 13.57 n.a. 5.8704463597 -0.43276 5.7796224295 27.43655 90.3459 /T 9.7548
1987-Oct-23 17:00 20 09 33.14 -20 35 31.4 9.96 4.15 13.57 n.a. 5.8704461863 -0.43276 5.7796334337 27.43655 90.3452 /T 9.7548
****************************************************************************************************************************************************
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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