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9 events found.

High Earth Orbit (HEO)

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A high Earth orbit is a geocentric orbit with an apogee farther than that of the geosynchronous orbit, which is 35,786 km (22,236 mi) away from Earth.

Events at this venue

Today
  • April 2026

  • Saturday

    Sat 18
    April 18, 2026
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Transiting Exoplanet Survey Satellite (TESS) Begins Next Year in Space #2

    Space telescope for NASA Explorers program, designed to search for exoplanets using the transit method in an area 400 times...
  • July 2026

  • Thursday

    Thu 23
    July 23, 2026
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Chandra X-ray Observatory Begins Next Year in Space

    NASA spacecraft in extended mission phase reaches 27th full year / begins 28th year of operations in space; instruments able...
  • October 2026

  • Monday

    Mon 19
    October 19, 2026
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Interstellar Boundary Explorer (IBEX) Begins Next Year in Space

    NASA spacecraft mapping boundary between the Solar System and interstellar space surpasses another full year in space; launched on this...
  • April 2027

  • Sunday

    Sun 18
    April 18, 2027
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Transiting Exoplanet Survey Satellite (TESS) Begins Next Year in Space

    Space telescope for NASA Explorers program, designed to search for exoplanets using the transit method in an area 400 times...
  • July 2027

  • Friday

    Fri 23
    July 23, 2027
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Chandra X-ray Observatory Begins Next Year in Space

    NASA spacecraft in extended mission phase reaches 28th full year / begins 29th year of operations in space; instruments able...
  • October 2027

  • Tuesday

    Tue 19
    October 19, 2027
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Interstellar Boundary Explorer (IBEX) Begins Next Year in Space

    NASA spacecraft mapping boundary between the Solar System and interstellar space surpasses another full year in space; launched on this...
  • October 2028

  • Thursday

    Thu 19
    October 19, 2028
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Interstellar Boundary Explorer (IBEX) Begins Next Year in Space

    NASA spacecraft mapping boundary between the Solar System and interstellar space surpasses another full year in space; launched on this...
  • October 2029

  • Friday

    Fri 19
    October 19, 2029
    — National Aeronautics and Space Administration (NASA),
    High Earth Orbit (HEO)

    Interstellar Boundary Explorer (IBEX) Begins Next Year in Space

    NASA spacecraft mapping boundary between the Solar System and interstellar space surpasses another full year in space; launched on this...
  • October 2030

  • Saturday

    Sat 19
    October 19, 2030
    High Earth Orbit (HEO)

    Interstellar Boundary Explorer (IBEX) Begins Next Year in Space

    NASA spacecraft mapping boundary between the Solar System and interstellar space surpasses another full year in space; launched on this...
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on the Moon!

For a limited time you can send your name & message to the lunar surface on the Astrolab FLIP mission and the ILOA ILO-1 mission in 2026-2027.

ILO-1 will be mounted on the Astrolab FLEX rover lightbar, and operate on the Moon for 1+ years — broadcasting Space Calendar and messages back to Earth along with near real-time images of the celestial sky and the Moon, on a weekly basis.

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