Table 2
H2O 110−101, NH3 10−00, and HCN J(1−0) line areas and Doppler shifts, together with the gas production rates.
| Production rate (s−1) | |||||||
|---|---|---|---|---|---|---|---|
| UT date (dd.dd/mm/yyyy) | rh (au) | Molec. | Line area(a) (mK km s−1) | Velocity shift (km s−1) | Nucleus(b) | Icy grains(c) Lp = 104 km | Icy grains(c) Lp = 5 × 104 km |
| 19.05/04/2010 | 6.206 | H2O | 19.0 ± 2.9(d) | +0.04 ± 0.04 | (4.6 ± 0.8) × 1027 | (1.6 ± 0.3) × 1027 | (4.4 ± 0.8) × 1027 |
| 11.02/05/2010 | 6.210 | H2O | 13.9 ± 3.4(d) | −0.16 ± 0.08 | (3.5 ± 0.9) × 1027 | (1.3 ± 0.3) × 1027 | (3.5 ± 0.9) × 1027 |
| 30.24/12/2010 | 6.244 | H2O | <9.8(d) | – | <2.4 × 1027 | <0.8 × 1027 | <2.3 × 1027 |
| 19.05/04/2010 | 6.206 | NHз | <13 | – | <5.6 × 1027 | ||
| 11.02/05/2010 | 6.210 | NHз | <15 | – | <7.1 × 1027 | ||
| 30.24/12/2010 | 6.244 | NHз | <14 | – | <6.0 × 1027 | ||
| 30.80/12/2007(e) | 5.981 | HCN | 19 ± 8 | – | (3.2 ± 1.3) × 1025 | (2.7 ± 1.1) × 1025 | (4.8 ± 2.0) × 1025 |
| 12.06/02/2010 | 6.194 | HCN | 10 ± 10 | – | (1.9 ± 1.9) × 1025 | (1.6 ± 1.6) × 1025 | (2.9 ± 2.9) × 1025 |
| 05.00/05/2010(f) | 6.210 | HCN | 21 ± 5 | – | (4.8 ± 1.1) × 1025 | (4.1 ± 0.9) × 1025 | (7.2 ± 1.7) × 1025 |
| 11.18/01/2011 | 6.245 | HCN | 37 ± 9 | – | (8.2 ± 2.0) × 1025 | (7.0 ± 1.7) × 1025 | (1.2 ± 0.3) × 1026 |
| 14.95/11/2021(g) | 5.931 | HCN | <18 | – | <3 × 1025 | <2.6 × 1025 | <4.5 × 1025 |
| Average 2007–2011 | 6.2 | HCN | 21 ± 4 | −0.04 ± 0.07 | (4.4 ± 0.8) × 1025 | (3.7 ± 0.7) × 1025 | (6.6 ± 1.2) × 1025 |
Notes. 3-σ upper limits are given in case of non- detection. (a)Line area in main-beam brightness temperature scale. For HCN J(1−0), sum of the three hyperfine components. (b)In the assumption of nucleus production, and assuming a coma temperature of 6K (see Sect. 3.1). (c)In the assumption of production from icy grains at the cometocentric distance Lp, with release at a temperature of 100 K (see Sect. 3.1). (d)Line area measured on HRS spectra. (e)Mean date for the average of measurements performed on 29.8 and 31.8 Dec 2010. (f)Mean date for the average of measurements performed on 17.87 April, 30.79 April, 22.6 May, and 28.78 May 2010. (g)Mean date for the average of measurements performed in November 2021.
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