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Proceedings Paper

From space to specs: requirements for 4MOST
Author(s): Olivier Schnurr; C. Jakob Walcher; Cristina Chiappini; Axel D. Schwope; Olga Bellido-Tirado; Roger Haynes; Sofia Feltzing; Richard McMahon; Roelof S. de Jong; Wolfgang Ansorge
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Paper Abstract

4MOST,1 the 4m Multi-Object spectrographic Survey Telescope, is an upcoming optical, fiber-fed, MOS facility for the VISTA telescope at ESO's Cero Paranal Observatory (Chile). The preliminary design of 4MOST features 2,400 fibers split into a low-resolution (1,600 fibers, 390-900 nm, R > 5; 000) and a high-resolution channel (800 fibers, three arms, ~20-25 nm coverage each, R > 18; 000) with an Echidna-style positioner, and covering a hexagonal field of view of ~4.1 sqdeg. 4MOST's main science goals encompass massive (tens of millions of spectra), all-Southern sky (> 18; 000 sqdeg) surveys following up both the Gaia (optical) and eROSITA (X-ray) space missions, plus cosmological science that complements missions such as e.g. Euclid. In a novel approach, observations of these science cases, which are very different from another, are to be carried out in parallel (i.e., simultaneously); thus, from the very different science requirements, key user requirements have to be identified, stringently formulated, and condensed into a coherent set of system specifications. Clearly, identifying common grounds and thereby significantly reducing complexity in both the formulated requirements and the final 4MOST facility, is a very challenging task. In this paper, we will present science and user requirements, and how the latter flow down from the former, and eventually further down to the system-specification level. Special emphasis will be put on the identification of key requirements and their validation and verification protocols, so that significant trade-offs can be done as early on in the design phase as possible, with as little impact as possible on the science capabilities upstream.

Paper Details

Date Published: 4 August 2014
PDF: 9 pages
Proc. SPIE 9150, Modeling, Systems Engineering, and Project Management for Astronomy VI, 91501C (4 August 2014); doi: 10.1117/12.2056466
Show Author Affiliations
Olivier Schnurr, Leibniz-Institut für Astrophysik Potsdam (Germany)
C. Jakob Walcher, Leibniz-Institut für Astrophysik Potsdam (Germany)
Cristina Chiappini, Leibniz-Institut für Astrophysik Potsdam (Germany)
Axel D. Schwope, Leibniz-Institut für Astrophysik Potsdam (Germany)
Olga Bellido-Tirado, Leibniz-Institut für Astrophysik Potsdam (Germany)
Roger Haynes, Leibniz-Institut für Astrophysik Potsdam (Germany)
Sofia Feltzing, Lund Observatory (Sweden)
Richard McMahon, Univ. of Cambridge (United Kingdom)
Roelof S. de Jong, Leibniz-Institut für Astrophysik Potsdam (Germany)
Wolfgang Ansorge, RAMS-CON Management Consultants (Germany)

Published in SPIE Proceedings Vol. 9150:
Modeling, Systems Engineering, and Project Management for Astronomy VI
George Z. Angeli; Philippe Dierickx, Editor(s)

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