subsatellite


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subsatellite

[′səb‚sad·əl‚īt]
(aerospace engineering)
An object that is carried into orbit by, and subsequently released from, an artificial satellite.
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In 1980, a 16th-degree spherical harmonic solution was obtained by combining most of the LO, Apollo, Apollo subsatellite, and LLR data available at the time [30]; this model was the best lunar gravity model for the next 13 years.
An in-plane tethered satellite system orbiting Earth under consideration consists of a mother satellite M, a subsatellite S, and a flexible tether, as shown in Figure 2.
When the satellite orbit is elliptical, the longitude ([L.sub.lon]) and the latitude ([L.sub.lat]) of the subsatellite point can be expressed as
Nash, Nock and others express hope that the Lunar Observer will head moonward in seven or eight years in the form of two identical spacecraft, each perhaps deploying a small "subsatellite" to help with some of the planned experiments.
Since LI is not by definition a GEO orbit, there is only one view from a given longitudinal perspective per day, provided at roughly 10-km (subsatellite point) resolution, hourly data, and at 12-h latency.
Orbiter NASA (U.S.) June 17, 2009 LCROSS NASA (U.S.) June 17, 2009 Spacecraft Notes Clementine Global maps (UV, visible, IR) Lunar Prospector Mapped surface composition SMART-1 Used ion-drive propulsion Kaguya (SELENE) Carried two subsatellites, HDTV Chang'e-1 First Chinese lunar spacecraft Chandrayaan-1 Found evidence of water Lunar Recon.
The European Space Agency's SMART-1 craft arrived in 2004, followed by Kaguya and its subsatellites Ouna and Okina (Japan Aerospace Exploration Agency, 2007), Chang'e 1 (China National Space Administration, 2007), and Chandrayaan-1 (India Space Research Organization, 2008).
The pole-crosing orbit means that the moon's whole surface will pass beneath the satellite, in comparison with the narrow streaks of data recorded by such devices as the "subsatellites" deployed from the manned Apollo 15 and 16 missions in 1971 and 1972.
The Chinese Chang'e-1 and Japanese Kaguya (with its subsatellites Ouna and Okina) are the only spacecraft currently in the lunar vicinity.