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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 |
References. (a)Altwegg et al. (2015). (b)Altwegg et al. (2017).
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