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EPOXI

Two intriguing investigations -- One flight-proven spacecraft

Earth Flyby 2007

Earth Flyby 2007 -- Ephemerides for selected cities

If your city is not listed, you can interpolate from two nearby ones or generate an ephemeris for your location.

Key:

  • Column 1 and 2: Visibility Indicators
    • R: EPOXI is above horizon (1 degree altitude/elevation)
    • V: EPOXI is in sunlight, above horizon, and the sky is dark
    • S: EPOXI is in sunlight
  • Columns 3-5: Day of week, date/time in Universal Time (time in Greenwich, UK)
  • Column 6: HEIGHT -- distance above Earth's surface
  • Column 7: SLANT RANGE -- range from the observer to the spacecraft
  • Columns 8 and 9: altitude and azimuth
  • Columns 10/11 and 12: right ascension and declination
  • Column 13: HRANG -- hour angle
  • Column 14: GEOC LAT -- geocentric latitude
  • Column 15: WEST LONG --
  • Column 16: CHART ANGLE -- angle through which one would rotate a star chart so that the plotted star field is correctly oriented with the direction toward the zenith in the direction one is looking (no mirror reversal etc. assumed)
  • Column 17: PHASE ANGLE --
  • Column 18: VISUAL MAG -- apparent magnitude; brightness (the greater the number, the fainter the object)
  • Column 19: SUN ALT -- altitude of sun above or below the horizon
  • Column 20: GCD MOON --
  • Column 21: TANOM -- true anomaly, the in-plane angle measured from the periapsis point
  • Column 22: EVT -- event indicators
    • ASC: EPOXI ascending node (equator crossing)
    • BEG: Begin EPOXI ephemeris data
    • CUL: Culmination (EPOXI maximum altitude/elevation)
    • DSC: EPOXI descending node (equator crossing)
    • END: End EPOXI ephemeris data
    • ETW: Evening twilight
    • MAG: EPOXI minimum magnitude (brightest)
    • MOO: Minimum EPOXI-Moon angle
    • MTW: Morning twilight
    • PER: EPOXI periapsis (closest to Earth)
    • PHA: Minimum phase angle (Sun-EPOXI-observer angle)
    • RIS: EPOXI rise (altitude/elevation 1 degree)
    • SET: EPOXI set (altitude/elevation 1 degree)
    • SLR: Minimum EPOXI slant range
    • SUN: Minimum sun altitude/elevation

Cities:

Listed eastward from 0° long. Listed alphabetically

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