The "HORIZONS On-Line Ephemeris System" provides easy access to key solar system data and flexible production of highly accurate ephemerides for solar system objects.
The ISO trajectory is publicly accessible from HORIZONS now (telnet or e-mail access only, not yet in the web interface). This allows you to generate ISO-centered observation ephemerides for any solar system target, geometric cartesian states vectors for ISO or orbital elements for ISO at any time/ period during the ISO mission (see examples below).
The telnet interface accesses all programme functions, including allowing ISO-centered coordinate systems.
Primary functional link (launches programme):
telnet://ssd.jpl.nasa.gov:6775
(or telnet ssd.jpl.nasa.gov 6775)
Other links you may want to consider:
http://ssd.jpl.nasa.gov/?horizons
http://ssd.jpl.nasa.gov/?horizons
Thomas Müller & Alberto Salama, ISO Data Centre, 8 August 2000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Worked Examples: 1) ISO-centric ephemerides for asteroid (4) Vesta telnet ssd.jpl.nasa.gov 6775 Horizons> Vesta; Select... [E]phemeris, [F]tp, [K]ermit, [M]ail, [R]edisplay, [S]PK : e Observe, Elements, Vectors [o,e,v,?] : o Coordinate center [,coord,geo ] : @iso Starting UT [ex: 1995-Nov-17 01:54 ] : 1997-Apr-28 02:03 Ending UT [ex: 1998-Jul-16 01:43 ] : 1997-Apr-28 04:05 Output interval [ex: 10m, 1h, 1d, ? ] : 10m Accept default output [ cr=(y), n, ?] : Select table quantities [ <#,#..>, ?] : 1,19,20 Select... [A]gain, [N]ew-case, [F]tp, [K]ermit, [M]ail, [R]edisplay : q 2) ISO Geometric cartesian states in Geocentric Frame (X,Y,Z,VX,VY,VZ) Horizons> ISO Select... [E]phemeris, [F]tp, [K]ermit, [M]ail, [R]edisplay, ?, : e Observe, Elements, Vectors [o,e,v,?] : v Coordinate center [ ,coord,geo ] : geo Reference plane [eclip, frame, body ] : eclip Starting TDB [ex: 1995-Nov-17 01:55 ] : 1997-Apr-28 02:03 Ending TDB [ex: 1998-Jul-16 01:44 ] : 1997-Apr-28 04:05 Output interval [ex: 10m, 1h, 1d, ? ] : 10m Accept default output [ cr=(y), n, ?] : Select... [A]gain, [N]ew-case, [F]tp, [K]ermit, [M]ail, [R]edisplay : q Acknowledgement: We would like to thank Jon Giorgini, JPL, for his support and for implementing the ISO orbit file and Nat Bachman, JPL, for the conversion of the ISO trajectory file and the SPK extensions. 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) e-mail : horizons@ssd.jpl.nasa.gov ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++