Table A.2.
SOFIA observations of comet 46P/Wirtanen.
| Flight | UT time | rh | Δ | t( ) |
σ( ) |
t(HDO) | σ(HDO) |
|---|---|---|---|---|---|---|---|
| (hr) | (au) | (au) | (min) | (mK) | (min) | (mK) | |
| 1 | Dec 14, 4.89–7.47 | 1.056 | 0.079 | 16.5 | 80 | 29.2 | 43 |
| 2 | Dec 17, 7.56–9.68 | 1.057 | 0.078 | 7.2 | 125 | 30.8 | 38 |
| 3 | Dec 18, 9.59–12.17 | 1.058 | 0.078 | 13.8 | 112 | 30.3 | 37 |
| 4 | Dec 19, 9.78–12.00 | 1.059 | 0.079 | 14.9 | 85 | 25.6 | 42 |
| 5 | Dec 20, 9.83–12.33 | 1.060 | 0.081 | 11.6 | 105 | 34.1 | 31 |
Notes. Entries in the table are flight number, UT range in hours, average heliocentric and geocentric distance of the comet (au) as given by the ephemeris, total on-source integration time (minutes), and the resulting rms noise level in a 0.14 km s−1 velocity channel (mK) for 
and HDO. The comet reached perihelion on December 12 at 22:20 UT and made the closest approach to the Earth on December 16 at 13:06 UT. At a 0.08 au geocentric distance, the field of view on the comet was about 3000 km.
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