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Table 1

C/2012 S1 (ISON) H2O and CO observations.

Line ν Date (UT) rha Δb φc Integ. Line aread Production rate (mol. s-1)
(GHz) yyyy/mm/dd.dd (AU) (AU) (°) time (min) (mK km s-1) Tkin = 8 K Tkin = 20 K

H2O 110–101 556.936 2013/03/08.13 4.54 4.07 11.8 177 <5.4e <4.8 × 1026f <3.5 × 1026f
CO 2–1 230.538 2013/03/15.70 4.45 4.10 12.5 21 40 ± 18 4.5 ± 2.0 × 1027 3.8 ± 1.7 × 1027
CO 2–1 230.538 2013/04/06.66–08.67 4.18 4.22 13.7 47 32 ± 13 3.5 ± 1.4 × 1027 2.9 ± 1.2 × 1027
CO 2–1 230.538 2013/03/15.7–04/08.7 4.27 4.19 13.0 68 38 ± 12 4.2 ± 1.3 × 1027 3.5 ± 1.1 × 1027

Notes.

(a)

rh is the comet’s heliocentric distance at the time of observation.

(b)

Δ is the distance from target to the observer.

(c)

Phase Angle.

(d)

Line area in the main beam brightness temperature scale computed in a (− 0.6,+ 0.6) km s-1 window.

(e)

From the HRS spectrum, the upper limit from the WBS spectrum is 4.2 mK km s-1.

(f)

The values provided for the gas production rates are 3σ upper limits.

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