  Although carbon monoxide (CO) is an abundant molecule and may have great
importance for planetary interiors, measurements of its properties are
difficult due to its extreme volatility. We calculate the equation of state for
CO over a range of temperature and density that is applicable to the conditions
in planetary interiors. Previous experimental and theoretical studies cover
only a limited temperature-density range. Our calculations match these early
results well, but now cover the full range of relevance. The method of
calculation is based on the general-purpose quotidian equation of state
described by More et al. (1988), which is here used in order to generate a
freely downloadable look-up table to be used by the community.
