The astronomical units
N. Capitaine, B. Guinot (Observatoire de Paris, France)
TL;DR
This paper reviews the status of the astronomical units of length and mass, discussing recent IAU resolutions and proposing a redefinition of the astronomical unit of length based on a fixed relation to the SI metre.
Contribution
It provides an update on the astronomical units and suggests a new definition for the astronomical unit of length tied to the SI metre.
Findings
Current status of the astronomical units of length and mass
Discussion on IAU resolutions and modern observations
Proposal for a fixed relation-based redefinition of the astronomical unit of length
Abstract
The IAU-1976 System of astronomical constants includes three astronomical units (i.e. for time, mass and length). This paper reports on the status of the astronomical unit of length (ua) and mass (MSun) within the context of the recent IAU Resolutions on reference systems and the use of modern observations in the solar system. We especially look at a possible re-definition of the ua as an astronomical unit of length defined trough a fixed relation to the SI metre by a defining number.
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Taxonomy
TopicsHistory and Developments in Astronomy · Historical Astronomy and Related Studies · Astronomical Observations and Instrumentation