Wenn's weiter nichts ist ;-)
Hallo Tom,
das kann das
HORIZONS System des JPL, das du über Webinterface so einstellen kannst, dass die gewünschte Ephemeride herauskommt. In punkto Genauigkeit und Menge der angebotenen Ausgabegrößen ist HORIZONS definitiv die letzte Instanz. Hier mal ein Auszug (ich habe versucht, das zu generieren, was du suchst):
<pre><font class="small">code:</font><hr>*******************************************************************************
Ephemeris / WWW_USER Tue Mar 8 01:03:49 2005 Pasadena, USA / Horizons
*******************************************************************************
Target body name: Charon (901) {source: PLU009}
Center body name: Earth (399) {source: DE405}
Center-site name: (User Defined Site)
*******************************************************************************
Start time : A.D. 2005-Mar-08 00:00:00.0000 UT
Stop time : A.D. 2005-Mar-23 00:00:00.0000 UT
Step-size : 1440 minutes
*******************************************************************************
Center geodetic : 11.340000, 47.2600, -0.000{E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 11.340000, 4336.5032, 4661.430{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 : IAU_CHARON {East-longitude +}
Target radii : 593.0 x 593.0 x 593.0 km {Equator, meridian, pole}
Target primary : Pluto {source: DE405}
Interfering body: MOON (Req= 1737.400) km {source: DE405}
Deflecting body : Sun, EARTH {source: DE405}
Deflecting GMs : 1.3271E+11, 3.9860E+05 km^3/s^2
Atmos refraction: NO (AIRLESS)
RA format : HMS
Time format : CAL
EOP file : eop.050304.p050526
EOP coverage : DATA-BASED 1962-JAN-20 TO 2005-MAR-04. PREDICTS-> 2005-MAY-25
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 )
*******************************************************************************
Date__(UT)__HR:MN X_(sat-primary)_Y SatPANG APmag S-brt Ang-diam
***********************************************************************
2005-Mar-08 00:00 -0.483 0.665 324.017 15.81 9.16 .053
2005-Mar-09 00:00 0.001 0.794 0.066 15.81 9.16 .053
2005-Mar-10 00:00 0.482 0.217 65.805 15.81 9.16 .053
2005-Mar-11 00:00 0.538 -0.551 135.728 15.81 9.16 .053
2005-Mar-12 00:00 0.117 -0.834 171.999 15.81 9.16 .053
2005-Mar-13 00:00 -0.410 -0.373 227.747 15.80 9.16 .053
2005-Mar-14 00:00 -0.570 0.427 306.835 15.80 9.16 .053
2005-Mar-15 00:00 -0.215 0.841 345.665 15.80 9.16 .053
2005-Mar-16 00:00 0.331 0.502 33.362 15.80 9.16 .053
2005-Mar-17 00:00 m 0.583 -0.279 115.594 15.80 9.16 .053
2005-Mar-18 00:00 m 0.321 -0.816 158.511 15.80 9.16 .053
2005-Mar-19 00:00 m -0.228 -0.630 199.890 15.80 9.16 .053
2005-Mar-20 00:00 m -0.574 0.125 282.240 15.80 9.16 .053
2005-Mar-21 00:00 m -0.402 0.767 332.335 15.79 9.16 .053
2005-Mar-22 00:00 m 0.131 0.719 10.318 15.79 9.16 .053
2005-Mar-23 00:00 m 0.547 0.034 86.465 15.79 9.16 .053
*******************************************************************************
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.
SOLAR PRESENCE
Time tag is followed by a blank, then a solar-presence symbol:
'*' Daylight (refracted solar upper-limb on or above apparent horizon)
'C' Civil twilight/dawn
'N' Nautical twilight/dawn
'A' Astronomical twilight/dawn
' ' Night OR geocentric ephemeris
LUNAR PRESENCE
The solar-presence symbol is immediately followed by a lunar-presence symbol:
'm' Refracted upper-limb of Moon on or above apparent horizon
' ' Refracted upper-limb of Moon below apparent horizon OR geocentric
ephemeris
X & Y satellite coordinates & position angle =
Satellite differential coordinates WRT the primary body along with the
satellite position angle. Differential coordinates are defined in RA as
X=[(RA_sat - RA_primary)*COS(DEC_primary)], in DEC as Y=(DEC_sat-DEC_primary).
Non-Lunar satellites only. "SatPANG" is CCW angle from the North Celestial Pole
to a line from primary/planet center to satellite center.
Units: ARCSECONDS (X & Y) and DEGREES (position angle)
APmag S-brt =
Target's approximate apparent visual magnitude & surface brightness. For
planets and satellites, values are available only for solar phase angles in the
range generally visible from Earth. This is to avoid extrapolation of models
beyond their valid (data-based) limits. Units: NONE & VISUAL MAGNITUDES PER
SQUARE ARCSECOND
Ang-diam =
The equatorial angular width of the target body full disk, if it were
fully visible to the observer. Units: ARCSECONDS
</pre><hr>
HORIZONS hat enorm viele Einstellmöglichkeiten; was genau da angeboten wird, schaust du dir am besten selber mal an.
Nun bin ich gespannt, wie du Pluto und Charon trennen willst, denn der Abstand ist stets kleiner als 1".
Gruß,
Tom
