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The orbit of the Moon is a nearly circular ellipse about the Earth (the semimajor and semiminor axes are 384,400 km and 383,800 km, respectively: a difference of only 0.16%). The equation of the ellipse yields an eccentricity of 0.0549 and perigee and apogee distances of 362,600 km (225,300 mi) and 405,400 km (251,900 mi) respectively (a ...
As of July 2023, the website UCS Satellite Database lists 6,718 known satellites. Of these, 580 are listed in the database as being at GEO. The website provides a spreadsheet containing details of all the satellites, which can be downloaded. Listings are from west to east (decreasing longitude in the Western Hemisphere and increasing longitude ...
List of USA satellites. This is a list of satellites and spacecraft which have been given USA designations by the United States Air Force. These designations have been applied to most United States military satellites since 1984, and replaced the earlier OPS designation. As of June 2022, USA designations have been assigned to 331 space satellites.
Was intended to orbit the Moon but instead orbited the Earth. Explored solar winds, interplanetary plasma, and solar X-rays. August 10 US: Lunar Orbiter 1: Atlas SLV-3 Agena-D: Moon Success: First US spacecraft to orbit the Moon. Designed to photograph smooth areas of the lunar surface for selecting landing sites. August 17 US: Pioneer 7: Delta ...
Sun–Earth L 4. L 4 is the Sun–Earth Lagrange point located close to the Earth's orbit 60° ahead of Earth. Asteroid (706765) 2010 TK 7 is the first discovered tadpole orbit companion to Earth, orbiting L 4; like Earth, its mean distance to the Sun is about one astronomical unit. Asteroid (614689) 2020 XL 5 is the second Earth trojan ...
Ghana. GhanaSat-1. All Nations University. Launched on same rocket as first Bangladeshi and Mongolian satellites. Mongolia. Mazaalai (satellite) National University of Mongolia. Launched on same rocket as first Ghanaian and Bangladeshi satellites. Latvia.
Earth observation satellite missions developed by the ESA as of 2019. Earth observation satellites are Earth-orbiting spacecraft with sensors used to collect imagery and measurements of the surface of the earth. These satellites are used to monitor short-term weather, long-term climate change, natural disasters.
NASA’s Galileo spacecraft caught a volcano erupting on IO.NASA. Io, the third-largest moon of Jupiter, is the most volcanically active body in the solar system. “The eruptions are so big that ...