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Table 1

Log of the observed rotational transitions in comets C/2001 Q4 (NEAT) and C/2002 T7 (LINEAR) in our SMT observing campaign from 7 to 11 May 2004.

Target Moleculea Frequency Dateb Transition Nc Expd ⟨ rh ⟩e ⟨ Δ ⟩f ⟨ φ ⟩g Beam FWHM
(GHz) (UT) (min) (AU) (AU) (°) (′′)

Q4 HCN 265.886180 7.98 3–2 20 120 0.972 0.323 8718 2791
Q4 H2CO 225.697775 8.12 312–211 15 90 0.972 0.324 8723 3288
T7 HCN 265.886180 8.68 3–2 30 120 0.702 0.522 11010 2791
T7 H2CO 225.697775 8.82 312–211 23 92 0.704 0.517 11054 3288
Q4 CO 230.538000 9.01 2–1 43 240 0.970 0.329 8736 3219
T7 CO 230.538000 9.67 2–1 24 96 0.713 0.487 11325 3219
T7 HCN 265.886180 9.70 3–2 15 60 0.713 0.486 11335 2791
T7 CS 244.935643 10.74 5–4 60 240 0.724 0.450 11670 3030
T7 CH3OH 241.700159 10.74 50–40 E 60 240 0.724 0.450 11670 3070
T7 CH3OH 241.767234 10.74 5-1–4-1 E 60 240 0.724 0.450 11670 3069
T7 CH3OH 241.791352 10.74 50–40 A+ 60 240 0.724 0.450 11670 3069
T7 CH3OH 241.832718 10.74 53–43 A+ 60 240 0.724 0.450 11670 3068
T7 CH3OH 241.833106 10.74 53–43 A 60 240 0.724 0.450 11670 3068
T7 CH3OH 241.842284 10.74 52–42 A 60 240 0.724 0.450 11670 3068
T7 CH3OH 241.843604 10.74 53–43 E 60 240 0.724 0.450 11670 3068
T7 CH3OH 241.879025 10.74 51–41 E 60 240 0.724 0.450 11670 3068
T7 CH3OH 241.887674 10.74 52–42 A+ 60 240 0.724 0.450 11670 3068
T7 CH3OH 241.904147 10.74 5-2–4-2 E 60 240 0.724 0.450 11670 3067
T7 CH3OH 241.904643 10.74 52–42 E 60 240 0.724 0.450 11670 3067
Q4 CS 244.935643 11.03 5–4 78 312 0.966 0.349 8707 3030
Q4 CH3OH 241.700159 11.03 50–40 E 78 312 0.966 0.349 8707 3070
Q4 CH3OH 241.767234 11.03 5-1–4-1 E 78 312 0.966 0.349 8707 3069
Q4 CH3OH 241.791352 11.03 50–40 A+ 78 312 0.966 0.349 8707 3069
Q4 CH3OH 241.832718 11.03 53–43 A+ 78 312 0.966 0.349 8707 3068
Q4 CH3OH 241.833106 11.03 53–43 A 78 312 0.966 0.349 8707 3068
Q4 CH3OH 241.842284 11.03 52–42 A 78 312 0.966 0.349 8707 3068
Q4 CH3OH 241.843604 11.03 53–43 E 78 312 0.966 0.349 8707 3068
Q4 CH3OH 241.879025 11.03 51–41 E 78 312 0.966 0.349 8707 3068
Q4 CH3OH 241.904147 11.03 5-2–4-2 E 78 312 0.966 0.349 8707 3067
Q4 CH3OH 241.904643 11.03 52–42 E 78 312 0.966 0.349 8707 3067
T7 HCN 265.886180 11.60 3–2 7 28 0.734 0.421 11950 2791
T7 HNC 271.981142 11.69 3–2 30 120 0.735 0.418 11979 2728
Q4 HNC 271.981142 11.95 3–2 45 180 0.964 0.362 8667 2728

Notes.

(a)

Observations of the CH3OH and CS lines were obtained simultaneously in the lower and upper sidebands respectively.

(b)

Observing times in UT decimal days in May 2004.

(c)

Number of individual scans.

(d)

Total integration time.

(e)

Heliocentric distance.

(f)

Geocentric distance.

(g)

Solar phase angle.

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