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Table 1

D/H in H2O during different mission phases and compared to previous evaluations.

Mission phase Dates D/H in H2O Heliocentric distance (au) # of evaluated spectra
First equinox May 2015 (5.03 ± 0.17) × 10−4 1.71–1.52 44
Perihelion August 2015 (5.01 ± 0.20) × 10−4 1.24 37
Peak gas production 30 August 2015 (4.98 ± 0.25) × 10−4 1.26 22
Second equinox March 2016 (5.02 ± 0.17) × 10−4 2.45–2.65 47

Relative mean ratio (5.01 ± 0.10) × 10−4 150
Absolute mean ratio (5.01 ± 0.41) × 10−4 150

Pre-first equinox(a) Aug./Sep. 2014 (5.3 ± 0.7) × 10−4 ≈3.4 26
Pre-second equinox(b) Dec. 2015/Mar. 2016 (5.25 ± 0.7) × 10−4 2.0 & 2.6 18

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