@prefix skos: . skos:prefLabel "Earth Observation Satellites"@en ; a skos:Concept ; skos:narrower . skos:definition """- Spacecraft Brief Description - The two primary goals of this satellite were to minimize the effects of non-gravitational forces and to obtain the highest possible accuracy for laser range measurements. The satellite was spherically shaped with a 12-cm radius. The core was an alloy of uranium 238 and 1.5% molybdenum. The skin consisted of 20 spherical caps made of an alloy of aluminum and 5% magnesium with triangular bases. Each cap contained three laser corner cubes. The corner cubes were fused silica trihedrons with circular apertures made of suprasil 1 with silver coatings covered by inconel. For Groupe de Recherches de Geodesie Spatiale (GRGS), the principal objective was to study earth and ocean tides by (1) the determination of the second harmonics (amplitude and phase) of the main semidiurnal oceanic tides (M and S) and, if possible, of the diurnal K, O, and P tides; and (2) the determination of the dissipation in the solid earth and in the oceans (Q). - Auxiliary Information - Launch Date and Time : 1975-02-06 Epoch Date and Time : 1975-02-20 Apogee (km or AU): 1108. Perigee (km or AU): 806. Inclination (degree) : 49.82 Orbit Type : Geocentric Information last updated on 1985-07-17 Group: Platform_Details Entry_ID: STARLETTE Group: Platform_Identification Platform_Category: Earth Observation Satellites Short_Name: STARLETTE End_Group Group: Synonymous_Platform_Names Short_Name: STARLETTE End_Group Group: Orbit Orbit_Inclination: 49.82 Perigee: 806 Apogee: 1108 End_Group Creation_Date: 2007-11-28 Group: Platform_Logistics Launch_Date: 1975-02-06 End_Group End_Group"""@en ; skos:prefLabel "STARLETTE"@en ; skos:inScheme ; skos:broader ; a skos:Concept .