Molecular observations of comets C/2012 S1 (ISON) and C/2013 R1 (Lovejoy): HNC/HCN ratios and upper limits to PH3

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Table 1

HCN J = 3–2 line parameters and HCN production rates

Date	r _h	Δ	dv^a	Δv ^b	Q(HCN)
(UT)	(au)	(au)	(K km s^-1)	(km s^-1)	(s^-1)

C/2012 S1 (ISON)

Nov. 13.4	0.67	0.93	0.46(14)	1.5(6)	6.5 × 10²⁵
Nov. 14.4	0.64	0.92	4.69(3)	2.37(5)	6.0 × 10²⁶
Nov. 15.4	0.61	0.90	2.87(2)	2.22(4)	3.6 × 10²⁶
Nov. 16.4	0.58	0.89	1.31(7)	2.21(10)	1.5 × 10²⁶

C/2013 R1 (Lovejoy)

Nov. 13.4	1.09	0.43	1.92(3)	1.52(7)	6.0 × 10²⁵
Nov. 16.4	1.06	0.41	2.06(2)	1.69(4)	6.1 × 10²⁵

Notes. Numbers in parentheses are 1σ uncertainties in units of the last digits.

^(a)

Additional error due to calibration is estimated to be 10–20%.

^(b)

Line width measured as FWHM.

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