Table 1
Measurements of the D/H ratio in hydrogen and methane from prior publications for Jupiter and Saturn.
| Saturn | Jupiter | Reference | Instrument/model | ||
|---|---|---|---|---|---|
| Hydrogen | Methane | Hydrogen | Methane | ||
| – |  |
– | – | Owen et al. (1986) | Model – Fourier Transform instrument, Kitt Peak National Observatory |
| – | 1.7(±1.1) | – | – | Noll et al. (1991) | Model – Fourier Transform Spectrometer, IRTF |
 |
– | – | – | Griffin et al. (1996) | ISO – LWS |
 (m) |
 (m) |
2.4 ± 0.4 (m) | 2.2 ± 0.7 (m) | Lellouch et al. (2001) | ISO – SWS |
| – | 2.4 ± 0.5 | – | – | Bézard et al. (2003) | TEXES |
| – | – | – | 2.4 ± 0.7 | Bjoraker et al. (1986) | Voyager IRIS |
| – | 1.6 ± 0.2 | – | – | Fletcher et al. (2009) | CIRS |
| 2.1 ± 0.13 (m) |  (i) |
2.95 ± 0.55 | – | Pierel et al. (2017) | CIRS |
| 1.62 ± 0.61 | – | – | – | ISO – SWS | |
| – | – | 2.6 ± 0.7 | – | Mahaffy et al. (1998) | Galileo |
 (i) |
 (m) |
– | – | This work | TEXES |
Notes. The quoted D/H ratios are of the order × 10−5. Entries marked (i) are inferred from corresponding measurements marked (m) for Lellouch et al. (2001), Pierel et al. (2017) and this work. The values quoted for the Methane column assume a fractionation factor of 1.34 ± 0.19 (Lellouch et al. 2001).
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