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Table 6

Gas temperature measurements.

UT date  ⟨ rh ⟩  Offset Lines Rotational temperature Gas temperature
[mm/dd.dd] [AU] [″] [K] [K]

C/2002 X5 (Kudo-Fujikawa): (2003)
01/13.61 0.553 3.5 CH3OH 157 GHz 38 ± 10 30 ± 10
01/26.54 0.213 3.0 CH3OH 157 GHz
01/26.54 0.213 1.6 CH3CN 147 GHz  > 190
01/26.54 0.213 1.0 HCNJ(3–2), v2 = 1/v2 = 0  < 245  < 5301
03/12.72 1.184 3.0 CH3OH 157 GHz

C/2002 V1 (NEAT): (2003)
02/17.0 0.120 1.9 HCNJ(3–2), v2 = 1/v2 = 0  < 285  < 5741
02/17.25 0.116 1.6 CH3OH 252 GHz
02/17.3 0.110 1.6 CH3OH 252 GHz+203A+−
02/17.6 0.108 1.8 HCNJ(3–2)/(1–0)

C/2006 P1 (McNaught): (2007)
01/16.56 0.228 3 HCNJ(3–2)/(1–0) 2992  > 3752
01/16.56 0.228 5 HCNJ(3–2)/(1–0)  > 1682  > 6002
01/16.55 0.229 5.9 CH3OH 157 GHz
01/16.56 0.229 4.9 CH3OH 157 GHz
01/17.5 0.255 6.5 HCNJ(3–2), v2 = 1/v2 = 0  < 278  < 6771
01/17.55 0.255 6.7 CH3OH 157 GHz  > 130  > 90
01/17.55 0.255 6.9 CH3CN 147 GHz

Notes. 

(1)

A significant fraction of the molecules are outside the collisional region and a higher gas temperature is needed to populate the v = 1 level inside the collision zone.

(2)

A 10% calibration uncertainty in each line is assumed.

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