LRO Mission Baseline Ephemeris v10.0

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Presentation transcript:

LRO Mission Baseline Ephemeris v10.0 Released July 1, 2009 Mark Beckman

Baseline Ephemeris LRO Mission Baseline Ephemeris is the baseline reference trajectory for the LRO mission What’s in v10.0? Same format as previous versions Consistent with actual launch date of June 18, 2009 (p30 case) Ephemeris starts at beginning of Commissioning Orbit No transfer orbit ephems M. Beckman/595

File 1 Description File 1 (LRO_Mission_Baseline_Ephemeris_v9_file1.txt) Time (Julian Date) Line every 5 minutes LRO Osculating Cartesian Position and Velocity (km) and (km/sec) Moon Centered Fixed coordinate frame Defined by DE421 Principal Axis frame LRO Right Ascension (deg) and Declination (deg) Moon Centered Mean J2000 coordinate frame Declination positive to Mean J2000 +Z axis Lunar Altitude (km) From mean lunar sphere Lunar Latitude (deg) & Longitude (deg) DE421 Principal Axis frame Lunar Ground Track Velocity (km/sec) Local Solar Time (deg) Angle between Moon-Sun vector and Moon-LRO vector measured about north ecliptic Solar Zenith Time (deg) Angle between Moon-Sun vector and Moon-LRO vector Lunar Pole Right Ascension (deg) and Declination (deg) Sun-Moon Distance (km) Subsolar Latitude (deg) & Longitude (deg) M. Beckman/595

File 2 Description File 2 (LRO_Mission_Baseline_Ephemeris_v9_file2.txt) Time (Julian Date) of Lunar Equator Ascending Node Line each ascending node Starts at first lunar ascending node after LOI-1 Osculating Semi-Major Axis (km) Osculating Eccentricity Osculating Inclination (deg) Osculating Argument of Periapsis (deg) Lunar Ground Track Velocity (km/sec) Local Solar Time (deg) Solar Zenith Time (deg) Orbit Beta Angle (deg) Angle between orbit plane and Sun M. Beckman/595

SPK Files Nominal Mission SPK file LRO_Mission_Baseline_Ephemeris_v9.bsp Moon centered Type 13 Interpolation order 11 LRO SPICE ID of -85 M. Beckman/595