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PHILAE: Science scheduling and unknown context. leassons learned

Fronton, Jean-Francois and Gaudon, Philippe and Delmas, Cedric and Lafaille, Vivian and Jurado, Eric and Durand, Joelle and Hallouard, Dominique and Mangeret, Maryse and Charpentier, Antoine and Ulamec, Stephan and Fantinati, Cinzia and Geurts, Koen and Salatti, Mario and Bibring, Jean-Pierre and Boehnhardt, Hermann (2015) PHILAE: Science scheduling and unknown context. leassons learned. IAC 2015, 12.-16. Oktober 2015, Jerusalem, Israel.

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Abstract

Rosetta is an ambitious mission launched in March 2004 to study the nucleus as well as the coma of the comet 67P/Churyumov-Gerasimenko. It is composed of a space probe and the Philae Lander. The mission is a series of premieres: among others, first probe to escort a comet, first time a landing site is selected with a so short notice, first time a lander has landed on a comet nucleus. The space probe Rosetta reached the vicinity of the comet in spring 2014 when it has started to study Churyumov-Gerasimenko with remote sensing instruments. An intense observation phase followed to be able to select a landing site for the Lander. And in November 2014, at a distance of about 3 AU from the sun, Philae has reached its destination on the surface of the comet 67P. Once stabilized on the comet, the lander has performed its “First Science sequence”. Philae’s aim was to perform detailed and innovative in-situ experiments on the comet’s surface to characterize the nucleus by performing mechanical, chemical and physical investigations on the comet surface. The main contribution to the Rosetta lander by the French space agency (CNES) is the Science Operation and Navigation Centre (SONC) located in Toulouse. Among its tasks is the scheduling of the scientific activities of the 10 lander experiments and then to provide it to the Lander Control Centre (LCC) located in DLR Cologne. Nevertheless, the specific context of the Rosetta mission made this task even more complex if compared to usual spacecraft or landers: indeed the teams in charge of the Philae activity scheduling had to cope with huge constraints in term of energy, data management, asynchronous processes and co-activities or exclusions between instruments. In addition to these huge constraints it is important to note that the comet, its environment and the landing conditions remained unknown until the separation time and that the landing site was selected a short time before it had to take place and when the baseline operational sequence was already designed. This paper will explain the specific context of the Rosetta lander mission and all the constraints that the activity scheduling had to face to fulfil the scientific objectives specified for Philae. A specific tool was developed by CNES and used to design the complete sequence of activities on the comet with respect to all constraints. The baseline scenario designed this way will also be detailed to highlight the difficulties and challenges that the operational team had to face. A specific focus will be given on the landing site selection and the impacts on the scientific operations scheduling. Moreover the actual sequence performed on the comet will also be detailed and analysed to deduce the lessons that could be learned from such an unprecedented endeavour. Indeed as for every mission of exploration the flexibility concept was anticipated but had to face unexpected events.

Item URL in elib:https://elib.dlr.de/101095/
Document Type:Conference or Workshop Item (Speech)
Title:PHILAE: Science scheduling and unknown context. leassons learned
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fronton, Jean-FrancoisCNES, ToulouseUNSPECIFIED
Gaudon, PhilippeCNES, ToulouseUNSPECIFIED
Delmas, CedricCNES, ToulouseUNSPECIFIED
Lafaille, VivianCNES, ToulouseUNSPECIFIED
Jurado, EricCNES, ToulouseUNSPECIFIED
Durand, JoelleCNES, Toulouse, FranceUNSPECIFIED
Hallouard, DominiqueATOS for CNESUNSPECIFIED
Mangeret, MaryseATOS for CNESUNSPECIFIED
Charpentier, AntoineATOS for CNESUNSPECIFIED
Ulamec, StephanDLR-Köln, stephan.ulamec (at) dlr.deUNSPECIFIED
Fantinati, CinziaDLR-Köln, cinzia.fantinati (at) dlr.deUNSPECIFIED
Geurts, KoenDLR-Köln, koen.geurts (at) dlr.deUNSPECIFIED
Salatti, MarioASI, RomUNSPECIFIED
Bibring, Jean-PierreIAS, ParisUNSPECIFIED
Boehnhardt, HermannMPS GöttingenUNSPECIFIED
Date:12 October 2015
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Rosetta, Philae,
Event Title:IAC 2015
Event Location:Jerusalem, Israel
Event Type:international Conference
Event Dates:12.-16. Oktober 2015
Organizer:IAC
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Lander
Location: Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Deposited By: Herrmann, Astrid
Deposited On:17 Dec 2015 09:22
Last Modified:31 Jul 2019 19:58

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