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Table 1

Periodic variation of water production in comet Lovejoy.

Odin measurements 29 January–3 February 2015, rh = 1.29 AU

Data points Molecule Production rate variation fitteda
Q0 Δ Q Tp T0
[1027 molec s-1] [days] [UT day]

23b H216O 751.6 ± 29.5 140 ± 21 0.938 ± 0.014 31.797 ± 0.038-Jan. 1.03
23b H216O 724.4 ± 14.6 141 ± 22 0.935 d 31.742-Jan.d 1.09
23b H216O 774.0 ± 12.4 0.0c 2.78
15 H218O 1.524 ± 0.065 0.374 ± 0.085 0.922 ± 0.031 31.400 ± 0.035-Jan. 1.21
15b H218O 1.453 ± 0.062 0.314 ± 0.083 0.935 d 31.742-Jan.d 1.23
15 H218O 1.421 ± 0.055 0.0c 2.44
38b HO, H218O e 724 ± 17 147 ± 19 0.939 ± 0.013 31.912 ± 0.022-Jan. 1.00

Notes.

(a)

Q = Q0 + Δ Q × sin(2π(tT0) /Tp), where Tp is the period in days of the fitted sine variation and T0 the reference time for the phase.

(b)

Including 5% uncertainty due to a 10′′ pointing uncertainty.

(c)

Fit of constant production.

(d)

fixed value (see text).

(e)

Assuming H216O /H218O = 500.

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