Starlette — LLMpedia

Starlette
Name	Starlette
Type	Passive geodetic satellite
Operator	CNES
Launched	1975-02-26
Mass	47 kg
Manufacturer	Centre National d'Études Spatiales
Orbit	Low Earth orbit

Contents

Starlette

Overview

Starlette was developed by the Centre National d'Études Spatiales with contributions from laboratories affiliated with Université Paris-Sud, Institut Géographique National, and industrial partners including Société Européenne de Propulsion and Aérospatiale. The project interfaced with global networks such as International Laser Ranging Service, World Data Center, International GNSS Service, International VLBI Service for Geodesy and Astrometry, and International DORIS Service to provide geometric reference points complementary to missions like LAGEOS, Beacon-B, Ajisai, GEOS-3, and TOPEX/Poseidon. Starlette's launch vehicle was the L4-Molniya derivative used by European programs and coordinated through launch facilities like Guiana Space Centre and tracking support from stations at Kerguelen Islands, Ascension Island, and Svalbard Satellite Station.

The satellite was a small, dense, spherical body designed by teams from CNRS and Thales Alenia Space with a mass near 47 kg and a diameter optimized to minimize atmospheric drag and thermal perturbations, inspired by predecessors such as LAGEOS and contemporaries like Ajisai and Ball Lens Satellite. Its exterior featured retroreflectors produced by manufacturers associated with Optique et Laser de France and tested in facilities at Observatoire de Paris and Laboratoire d'Astrophysique de Marseille. Engineering oversight involved standards from European Space Research Organisation archives and quality review processes similar to those used by NASA Goddard Space Flight Center, Jet Propulsion Laboratory, and Johns Hopkins University Applied Physics Laboratory. Structural materials were evaluated against radiation environments characterized by Van Allen radiation belt models and solar activity indices from NOAA and Solar and Heliospheric Observatory datasets.

Operational coordination for Starlette involved campaign planning with the International Laser Ranging Service, scheduling with network stations at Yarragadee Observatory, Herstmonceux, Zimmerwald Observatory, Mt. Stromlo Observatory, and collaboration with agencies like French Space Agency and Indian Space Research Organisation. Tracking passes were recorded with ranging equipment similar to that used in missions by European Space Agency and analyzed at data centers akin to NASA Crustal Dynamics Data Information System and Scripps Institution of Oceanography. Operations encompassed orbit maintenance studies, atmospheric drag characterization alongside experiments from European Centre for Medium-Range Weather Forecasts, and support for gravity-field campaigns coordinated with GRACE and GOCE mission scientists. Mission logs referenced meetings at International Union of Geodesy and Geophysics assemblies and results presented at conferences such as the American Geophysical Union fall meeting and symposia at European Geosciences Union.

Starlette provided precise laser-ranging datasets that fed gravitational models developed by groups at Institut de Physique du Globe de Paris, Massachusetts Institute of Technology, University of Texas at Austin, and University of Bern. Its data contributed to refined geopotential coefficients used by projects like EGM96, EIGEN series, and informed secular variation studies published by authors affiliated with International Association of Geodesy commissions. Studies using Starlette data enhanced understanding of atmospheric density models from Jacchia and NRLMSISE-00, improved tidal loading corrections based on work by Cartwright and Tayler and Agnew, and supported investigations into post-glacial rebound models crafted at University of Edinburgh, Utrecht University, and Stockholm University. The satellite's contributions were cited in geodetic reference frame realizations by International Earth Rotation and Reference Systems Service and in Earth system science syntheses at Intergovernmental Panel on Climate Change assessments.

Starlette occupied a low Earth orbit with parameters monitored by observatories in networks like International Laser Ranging Service, European Space Operations Centre, and analysis centers at GFZ German Research Centre for Geosciences and INSEE. Its high area-to-mass ratio and spherical design enabled precise determination of perturbations due to atmospheric drag, solar radiation pressure, and geopotential harmonics, complementing datasets from LAGEOS and AJISAI. Tracking technologies involved stations equipped with equipment modeled after systems at McDonald Observatory, Metsähovi Radio Observatory, and Herzberg Astronomy and Astrophysics Research Centre, using timing standards traceable to Bureau International des Poids et Mesures and atomic clocks from National Institute of Standards and Technology. Orbital analyses were compared with models from Jet Propulsion Laboratory and used in orbit determination software developed at European Space Agency and CNES.

Starlette's long-term datasets influenced subsequent satellite missions and programs funded or staffed by organizations such as European Space Agency, NASA, CNES, DLR, and ISRO, informing design choices for missions like GOCE, GRACE, Swarm, and later laser-ranging targets. The project's collaboration networks strengthened international efforts embodied by International Laser Ranging Service and data practices later codified at International Association of Geodesy and International Earth Rotation and Reference Systems Service. Educational and research institutions including École Polytechnique, Imperial College London, Stanford University, Princeton University, and University of California, Berkeley utilized Starlette data in theses and curriculum development, and its influence persisted in standards promulgated by International Organization for Standardization committees and geodetic working groups at United Nations conventions.

Category:Satellites launched in 1975 Category:Geodesy satellites