A dataset provided by the European Space Agency

Name GIO-C-GRE-3-RDR-HALLEY
Mission GIOTTO
URL ftp://npsa01.esac.esa.int/pub/mirror/GIOTTO/GRE/GIO-C-GRE-3-RDR-HALLEY-V1.0
DOI https://doi.org/10.5270/esa-vjn4vvr
Abstract The GIO-C-GRE-3-RDR-HALLEY-V1.0 data set contains the calibrated data from the radio science experiment of the GIOTTO mission of the European Space Agency. The data were obtained during the GIOTTO flyby on comet Hally in march 1986
Description Data Set Overview = The Giotto Radio Science Experiment data set consists of four tables. Each table contains a measurement value listed as a function of time. The measurements are: closed-loop receiver carrier signal amplitude, closed-loop receiver carrier frequency residual, open-loop receiver carrier signal amplitude, and open-loop receiver carrier frequency. The measurements of frequency and frequency residual may be converted to changes in spacecraft velocity during the Halley encounter. The changes in velocity may then be interpreted in terms of mass fluence (dust and gas) within Halley's coma [EDENHOFERETAL1986A], [EDENHOFERETAL1986B], [EDENHOFERETAL1986C], [EDENHOFERETAL1986D], [EDENHOFERETAL1987A]. More detailed analyses of the dynamics of the spacecraft as inferred from the GRE data have been published by [BIRDETAL1988], [PAETZOLDETAL1988], [PAETZOLDETAL1990], [PAETZOLDETAL1991A], [PAETZOLDETAL1991B], and [PAETZOLDETAL1991C]. Parameters The closed-loop receiver carrier signal amplitude is the measured strength of the spacecraft signal at the DSN 70-m antenna when connected to a closed-loop receiver. The data file GREACL is a table of signal level measurements (in units of dB relative to 1 milliwatt) taken at 1 second intervals starting at 0 h on 14 March 1986. The closed-loop receiver frequency residual is the measured frequency of the spacecraft signal at the DSN 70-m antenna relative to the frequency expected from the spacecraft moving only in response to gravitational forces. The data file GREFCL is a table of residual frequencies (in units of Hz) taken at 0.1 second intervals starting at 0 h on 14 March 1986. The open-loop receiver carrier signal amplitude is the measured strength of the spacecraft signal at the DSN 70-m antenna when connected to an open-loop receiver. The data file GREAOL is a table of signal level measurements (in units of dB relative to 1 milliwatt) taken a...
Instrument GRE
Temporal Coverage 1986-03-14T00:00:00.000Z/1986-03-14T00:24:00.000Z
Version V1.0
Mission Description Mission Overview In 1978,ESA was invited by NASA to plan a joint mission consisting of a comet Halley fly-by in November 1985 and a rendezvous with comet Tempel 2 in 1988. The mission comprised an American main spacecraft which would carry a European probe. The main spacecraft, with its array of sophisticated cameras and experiments, would complete a fly-by of comet Halley at a safe distance. Shortly before fly-by, the probe would be released towards the nucleus to make detailed in-situ observations in the innermost coma. In January 1980, however, it became clear that financial support for the Halley Fly-by/Tempel 2 Rendezvous mission could not be secured in the USA. By that time the interest of European scientists had built up such momentum that ESA considered the possibility of a purely European mission. The support for a fly-by mission was strong in Europe and went far beyond the small section of scientists specialised in cometary research. A fly-by of comet Halley was suggested to ESA by the scientific community in February 1980. Rather than having the American spacecraft deliver the probe to the comet as in the earlier concept, the Europeans proposed that the capabilities of the small probe be increased by building an independent, self-sufficient spacecraft to be launched using the European Ariane rocket. The limited time available for development and the small financial resources made it advisable to use a spin-stabilised spacecraft derived from the European Earth orbiting spacecraft Geos. This proposal was studied by ESA in the first half of 1980. The European mission to comet Halley was named Giotto after the Italian painter Giotto di Bondone who depicted comet Halley as the `Star of Bethlehem' in one of his frescoes in the Scrovegni chapel in Padua in 1304. The Giotto mission was finally approved as ESA's first interplanetary mission on 7 July 1980. An Announcement of Opportunity was issued ...
Creator Contact INTERNATIONAL HALLEY WATCH
Date Published 1992-04-30
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 1992-04-30, GIO-C-GRE-3-RDR-HALLEY, V1.0. https://doi.org/10.5270/esa-vjn4vvr