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Units of relativistic time scales and associated quantities

  • S. A. Klioner (a1), N. Capitaine (a2), W. M. Folkner (a3), B. Guinot (a2), T.-Y. Huang (a4), S. M. Kopeikin (a5), E. V. Pitjeva (a6), P. K. Seidelmann (a7) and M. H. Soffel (a1)...

Abstract

This note suggests nomenclature for dealing with the units of various astronomical quantities that are used with the relativistic time scales TT, TDB, TCB and TCG. It is suggested to avoid wordings like “TDB units” and “TT units” and avoid contrasting them to “SI units”. The quantities intended for use with TCG, TCB, TT or TDB should be called “TCG-compatible”, “TCB-compatible”, “TT-compatible” or “TDB-compatible”, respectively. The names of the units second and meter for numerical values of all these quantities should be used without any adjectives. This suggestion comes from a special discussion forum created within IAU Commission 52 “Relativity in Fundamental Astronomy”.

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References

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Emerson, W. H. 2008, Metrologia, 45, 134
de Boer, J. 1994/1995, Metrologia, 32, 405
Guinot, B. 1997, Metrologia, 34, 261
IAU, Information Bulletin, 88 (2001) (errata in IAU Information Bulletin, 89)
IAU Resolutions adopted at the XXVIth General Assembly of the IAU (2006), Resolution 3 “Re-definition of Barycentric Dynamical Time, TDB”, http://www.iau.org/Resolutions_at_GA-XXVI.340.0.html
IERS Conventions 2003, ed. McCarthy, D. D. & Petit, G., IERS Technical Note No. 32 (Frankfurt am Main: Verlag des Bundesamtes für Kartographie und Geodäsie)
International standard ISO 31-0: Quantities and units – Part 0: General principles. International Organization for Standardization, Geneva, 1992
The International System of Units (SI), 8th edition. Bureau International des Poids et Mesures, 2006
International Vocabulary of Basic and General Terms in Metrology. International Organization for Standardization, Geneva, 1993
Klioner, S. A. 2008, Astron.Astrophys., 478, 951
Rickman, H. 2001, Reports on Astronomy, Trans. IAU, XXIV B
Soffel, M., Klioner, S. A., Petit, G. et al. , 2003, Astron. J. 126, 2687
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Units of relativistic time scales and associated quantities

  • S. A. Klioner (a1), N. Capitaine (a2), W. M. Folkner (a3), B. Guinot (a2), T.-Y. Huang (a4), S. M. Kopeikin (a5), E. V. Pitjeva (a6), P. K. Seidelmann (a7) and M. H. Soffel (a1)...

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