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Home All issues Volume 539 (March 2012) A&A, 539 (2012) A68 Full HTML
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Table 1

Molecular observations in comet 10P/Tempel 2.

UT date  ⟨ rh ⟩   ⟨ rΔ ⟩  Integ. time Line Intensity Velocity shiftb Prod. rate
[mm/dd.dd] [AU] [AU] [min]a [K  km s-1] [ km s-1] [mol s-1]
1999 perihelion passage:
JCMT 09/04.2–06.3 1.482 0.816 157 HCN(4–3) 0.058 ± 0.012  −0.86 ± 0.23 0.5 ± 0.1 × 1025
CSO 09/11.2–12.3 1.482 0.851 133 HCN(3–2) 0.106 ± 0.012  −0.20 ± 0.08 1.4 ± 0.2 × 1025
CSO 09/12.32 1.482 0.855 72 CH3OH(41 − 40A-+) 0.080 ± 0.018  + 0.19 ± 0.15
CH3OH(21 − 20A-+) 0.119 ± 0.016  −0.10 ± 0.08 3.7 ± 1.0 × 1026
JCMT 10/01.3–02.3 1.500 0.980 67 HCN(3–2) 0.090 ± 0.019  −0.57 ± 0.18 0.9 ± 0.2 × 1025
2010 perihelion passage:
IRAM 07/07.28 1.423 0.745 126 HCN(1–0) 0.057 ± 0.013  −0.16 ± 0.16 1.6 ± 0.4 × 1025
IRAM 07/08.26 1.423 0.742 131 HCN(1–0) 0.054 ± 0.009  −0.44 ± 0.14 1.5 ± 0.2 × 1025
IRAM 07/10.22 1.424 0.734 103 HCN(3–2) 0.410 ± 0.033  −0.30 ± 0.05 1.5 ± 0.1 × 1025
IRAM 07/10.34 1.424 0.734 42 HCN(1–0) 0.044 ± 0.016  −0.65 ± 0.33 1.2 ± 0.4 × 1025
IRAM 07/11.17 1.424 0.731 61 HCN(3–2) 0.427 ± 0.036  −0.41 ± 0.05 1.6 ± 0.2 × 1025
IRAM 07/11.28 1.424 0.731 131 HCN(1–0) 0.068 ± 0.010  −0.49 ± 0.13 1.8 ± 0.3 × 1025
IRAM 07/07.2–08.4 1.423 0.743 257 CH3OH(10 − 1-1E) 0.028 ± 0.010
CH3OH(20 − 2-1E) 0.044 ± 0.010
CH3OH(30 − 3-1E) 0.032 ± 0.010
CH3OH(40 − 4-1E) 0.050 ± 0.010  −0.41 ± 0.10c 3.2 ± 0.8 × 1026
CH3OH(50 − 5-1E) 0.030 ± 0.010
CH3OH(60 − 6-1E) 0.036 ± 0.010
CH3OH(70 − 7-1E) 0.008 ± 0.010
IRAM 07/11.26 1.424 0.731 98 CH3OH(10 − 1-1E) 0.024 ± 0.008
CH3OH(20 − 2-1E) 0.046 ± 0.008
CH3OH(30 − 3-1E) 0.050 ± 0.008
CH3OH(40 − 4-1E) 0.041 ± 0.008  −0.42 ± 0.08c 3.2 ± 0.4 × 1026
CH3OH(50 − 5-1E) 0.030 ± 0.008
CH3OH(60 − 6-1E) 0.017 ± 0.008
CH3OH(70 − 7-1E) 0.011 ± 0.008
IRAM 07/10.34 1.424 0.734 42 H2S(110 − 101) 0.065 ± 0.021  −0.43 ± 0.26 7.1 ± 2.3 × 1026
IRAM 07/11.34 1.424 0.730 33 CS(3–2) 0.049 ± 0.011  −0.02 ± 0.14 1.5 ± 0.3 × 1025
IRAM 07/11.34 1.424 0.730 33 CH3CN(8K–7K) K = 0,1,2d  <0.062  <0.8 × 1025
HIFI 07/18.9–19.3 1.431 0.708 54 H2O(110–101) 5.509 ± 0.005  −0.062 ± 0.001 2.2 ± 0.1 × 1028
HIFI 07/18.9–19.3 1.431 0.708 54 NH3(10–00) 0.072 ± 0.005  −0.43 ± 0.06e 10.0 ± 0.7 × 1025

Notes. 

(a)

Total integration time, ON+OFF, or ON in frequency switching mode (JCMT and HIFI);

(b)

reference line frequencies (excepted for NH3 – see texte) were taken from CDMS (Müller et al. 2005);

(c)

value based on the average of the 6 strongest lines;

(d)

sum of the three transitions JK =  80–70, 81–71, and 82–72;

(e)

Doppler shift measured with respect to the barycentric position of the hyperfine structure of the line at 572 498.160 MHz.

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