Ephemeris Generator
Ephemeris Settings
Target Body: *Comet C/Hyakutake (1996 B2 = 1996 B2) [1996.83]*
Observer Location: *Geocentric [Code=500]*
Coordinates: *0 00'00.0''E, 0 00'00.0''N, -6378140. m*
From: *A.D. 1990-09-17 00:00 UT*
To: *A.D. 1990-09-19 00:00 *
Step: *2 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 11:22:27 2005 Pasadena, USA / Horizons
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Target body name: Hyakutake (C/1996 B2) {source: JPL#68}
Center body name: Earth (399) {source: DE-0406LE-0406}
Center-site name: GEOCENTRIC
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Start time : A.D. 1990-Sep-17 00:00:00.0000 UT
Stop time : A.D. 1990-Sep-19 00:00:00.0000 UT
Step-size : 120 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 : 2.1 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= 2450400.5 != 1996-Nov-13.0000000 (CT) Residual RMS= .87646
EC= .999901956774384 QR= .2302042979120773 TP= 2450204.892527377
OM= 188.057703178702 W= 130.1729309148325 IN= 124.9227060156376
Comet physical & dynamic parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days):
GM= n.a. RAD= 2.1 A1= 2.714176E-8
A2= 7.460048D-10 A3= n.a. DT= n.a.
M1= 5. M2= 9. k1= 7.5
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-17 00:00 12 59 02.87 -36 58 25.7 6.81 -0.60 20.63 21.59 17.5060024251 -9.93144 18.2184688727 4.78934 43.7397 /T 2.2785
1990-Sep-17 02:00 12 59 04.01 -36 58 26.8 6.82 -0.60 20.63 21.59 17.5055244392 -9.93158 18.2186987891 4.76020 43.6824 /T 2.2761
1990-Sep-17 04:00 12 59 05.14 -36 58 28.0 6.82 -0.61 20.63 21.59 17.5050464466 -9.93171 18.2189273026 4.73104 43.6251 /T 2.2737
1990-Sep-17 06:00 12 59 06.28 -36 58 29.3 6.82 -0.62 20.63 21.59 17.5045684475 -9.93185 18.2191544117 4.70184 43.5679 /T 2.2714
1990-Sep-17 08:00 12 59 07.42 -36 58 30.5 6.83 -0.62 20.63 21.59 17.5040904419 -9.93198 18.2193801149 4.67261 43.5107 /T 2.2690
1990-Sep-17 10:00 12 59 08.56 -36 58 31.7 6.83 -0.63 20.63 21.59 17.5036124296 -9.93212 18.2196044106 4.64335 43.4536 /T 2.2666
1990-Sep-17 12:00 12 59 09.70 -36 58 33.0 6.84 -0.64 20.63 21.59 17.5031344108 -9.93225 18.2198272974 4.61405 43.3965 /T 2.2642
1990-Sep-17 14:00 12 59 10.84 -36 58 34.2 6.84 -0.64 20.63 21.59 17.5026563854 -9.93239 18.2200487736 4.58473 43.3395 /T 2.2619
1990-Sep-17 16:00 12 59 11.98 -36 58 35.5 6.84 -0.65 20.63 21.59 17.5021783535 -9.93252 18.2202688379 4.55538 43.2825 /T 2.2595
1990-Sep-17 18:00 12 59 13.12 -36 58 36.8 6.85 -0.66 20.63 21.59 17.5017003149 -9.93266 18.2204874887 4.52599 43.2256 /T 2.2571
1990-Sep-17 20:00 12 59 14.27 -36 58 38.1 6.85 -0.66 20.63 21.59 17.5012222698 -9.93280 18.2207047245 4.49657 43.1687 /T 2.2548
1990-Sep-17 22:00 12 59 15.41 -36 58 39.4 6.86 -0.67 20.63 21.59 17.5007442181 -9.93293 18.2209205439 4.46713 43.1118 /T 2.2524
1990-Sep-18 00:00 12 59 16.55 -36 58 40.7 6.86 -0.68 20.63 21.59 17.5002661598 -9.93307 18.2211349453 4.43765 43.0551 /T 2.2500
1990-Sep-18 02:00 12 59 17.70 -36 58 42.1 6.86 -0.68 20.63 21.59 17.4997880950 -9.93320 18.2213479273 4.40814 42.9983 /T 2.2476
1990-Sep-18 04:00 12 59 18.84 -36 58 43.4 6.87 -0.69 20.63 21.59 17.4993100235 -9.93334 18.2215594885 4.37860 42.9417 /T 2.2453
1990-Sep-18 06:00 12 59 19.99 -36 58 44.8 6.87 -0.70 20.63 21.59 17.4988319455 -9.93347 18.2217696273 4.34903 42.8850 /T 2.2429
1990-Sep-18 08:00 12 59 21.13 -36 58 46.2 6.87 -0.70 20.63 21.59 17.4983538609 -9.93361 18.2219783422 4.31943 42.8285 /T 2.2405
1990-Sep-18 10:00 12 59 22.28 -36 58 47.6 6.88 -0.71 20.63 21.59 17.4978757698 -9.93375 18.2221856320 4.28980 42.7720 /T 2.2382
1990-Sep-18 12:00 12 59 23.43 -36 58 49.0 6.88 -0.71 20.63 21.58 17.4973976720 -9.93388 18.2223914950 4.26014 42.7155 /T 2.2358
1990-Sep-18 14:00 12 59 24.57 -36 58 50.4 6.89 -0.72 20.63 21.58 17.4969195677 -9.93402 18.2225959299 4.23045 42.6591 /T 2.2334
1990-Sep-18 16:00 12 59 25.72 -36 58 51.8 6.89 -0.73 20.63 21.58 17.4964414568 -9.93415 18.2227989352 4.20073 42.6027 /T 2.2310
1990-Sep-18 18:00 12 59 26.87 -36 58 53.3 6.89 -0.73 20.63 21.58 17.4959633393 -9.93429 18.2230005095 4.17098 42.5464 /T 2.2287
1990-Sep-18 20:00 12 59 28.02 -36 58 54.7 6.90 -0.74 20.63 21.58 17.4954852152 -9.93442 18.2232006513 4.14120 42.4902 /T 2.2263
1990-Sep-18 22:00 12 59 29.17 -36 58 56.2 6.90 -0.75 20.63 21.58 17.4950070846 -9.93456 18.2233993593 4.11139 42.4340 /T 2.2239
1990-Sep-19 00:00 12 59 30.32 -36 58 57.7 6.90 -0.75 20.62 21.58 17.4945289474 -9.93470 18.2235966321 4.08155 42.3778 /T 2.2215
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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 =
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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