Table 1
OH, NH, CN, C3, and C2 production rates and Afρ of comet C/2013 A1 (Siding Spring) from TRAPPIST observations.
| UT Date | r | Δ | Sun PA | Production rates | A(0)fρ | ||||
| (au) | (au) | (deg) | (1025 mol/s) | (103 cm) | |||||
| Q(OH) | Q(NH) | Q(CN) | Q(C3) | Q(C2) | (445.3 nm) | ||||
|
|
|||||||||
| 2013 Nov. 16.52 | 4.42 | 3.82 | 336 | 1.54 ± 0.13 | |||||
| 2014 Jan. 25.09 | 3.73 | 3.70 | 70 | 1.46 ± 0.10 | |||||
| 2014 Jan. 29.09 | 3.69 | 3.71 | 74 | 1.48 ± 0.08 | |||||
| 2014 Feb. 04.06 | 3.63 | 3.73 | 79 | 1.46 ± 0.08 | |||||
| 2014 Feb. 12.05 | 3.55 | 3.76 | 86 | 1.50 ± 0.13 | |||||
| 2014 Mar. 26.01 | 3.13 | 3.76 | 127 | 1.06 ± 0.08 | |||||
| 2014 Jun. 02.42 | 2.43 | 2.93 | 230 | 1.03 ± 0.05 | |||||
| 2014 Jun. 03.42 | 2.42 | 2.91 | 209 | 1.10 ± 0.11 | |||||
| 2014 Jun. 17.40 | 2.27 | 2.60 | 220 | 1.20 ± 0.11 | 1.14 ± 0.08 | ||||
| 2014 Jun. 20.44 | 2.24 | 2.53 | 222 | 1.19 ± 0.06 | |||||
| 2014 Jun. 21.43 | 2.23 | 2.51 | 223 | 1.27 ± 0.13 | 1.16 ± 0.04 | ||||
| 2014 Jun. 22.43 | 2.22 | 2.49 | 223 | 1.27 ± 0.14 | |||||
| 2014 Jun. 24.42 | 2.20 | 2.44 | 225 | 1.26 ± 0.09 | 1.67 ± 0.11 | 1.15 ± 0.03 | |||
| 2014 Jun. 25.43 | 2.19 | 2.41 | 225 | 1.13 ± 0.12 | 1.51 ± 0.14 | 1.11 ± 0.03 | |||
| 2014 Jun. 26.43 | 2.18 | 2.39 | 226 | ||||||
| 2014 Jun. 30.42 | 2.15 | 2.29 | 228 | 1.42 ± 0.15 | 1.11 ± 0.03 | ||||
| 2014 Jul. 01.42 | 2.14 | 2.26 | 229 | 1.32 ± 0.08 | |||||
| 2014 Jul. 06.38 | 2.09 | 2.14 | 232 | 1.11 ± 0.07 | 0.58 ± 0.03 | 1.48 ± 0.11 | 1.11 ± 0.06 | ||
| 2014 Jul. 10.42 | 2.05 | 2.03 | 235 | 833 ± 130 | 1.52 ± 0.09 | 1.78 ± 0.09 | 1.18 ± 0.03 | ||
| 2014 Jul. 13.41 | 2.02 | 1.95 | 236 | 0.33 ± 0.05 | 1.12 ± 0.06 | ||||
| 2014 Jul. 18.42 | 1.97 | 1.82 | 240 | 1.50 ± 0.13 | 1.38 ± 0.11 | 1.19 ± 0.05 | |||
| 2014 Jul. 21.42 | 1.94 | 1.74 | 242 | 735 ± 100 | |||||
| 2014 Jul. 24.39 | 1.92 | 1.66 | 244 | 1.38 ± 0.07 | 0.38 ± 0.03 | 1.70 ± 0.10 | 1.15 ± 0.02 | ||
| 2014 Jul. 25.40 | 1.91 | 1.63 | 245 | 0.35 ± 0.03 | 1.68 ± 0.07 | ||||
| 2014 Aug. 07.27 | 1.79 | 1.31 | 257 | 1.57 ± 0.10 | 2.00 ± 0.21 | 1.10 ± 0.04 | |||
| 2014 Aug. 10.34 | 1.77 | 1.24 | 261 | 863 ± 106 | 2.04 ± 0.87 | 1.51 ± 0.09 | 0.36 ± 0.05 | 1.77 ± 0.15 | 1.08 ± 0.04 |
| 2014 Aug. 17.39 | 1.71 | 1.09 | 274 | 830 ± 132 | 2.45 ± 1.03 | 1.57 ± 0.11 | 0.49 ± 0.05 | 1.91 ± 0.12 | 1.07 ± 0.08 |
| 2014 Aug. 20.35 | 1.69 | 1.04 | 281 | 808 ± 143 | 1.37 ± 0.14 | 0.35 ± 0.05 | 1.51 ± 0.16 | 1.11 ± 0.05 | |
| 2014 Sep. 04.22 | 1.58 | 0.89 | 13 | 757 ± 117 | 3.49 ± 0.65 | 1.45 ± 0.07 | 2.04 ± 0.13 | 1.05 ± 0.04 | |
| 2014 Sep. 06.98 | 1.56 | 0.89 | 37 | 712 ± 129 | 2.89 ± 0.98 | 1.52 ± 0.11 | 0.43 ± 0.04 | 1.87 ± 0.13 | 0.97 ± 0.05 |
| 2014 Sep. 07.31 | 1.56 | 0.89 | 39 | 780 ± 154 | 1.65 ± 0.10 | 2.04 ± 0.13 | |||
| 2014 Sep. 19.08 | 1.49 | 1.00 | 84 | 785 ± 109 | 1.36 ± 0.06 | 0.37 ± 0.02 | 1.56 ± 0.11 | 0.88 ± 0.02 | |
| 2014 Sep. 24.08 | 1.47 | 1.08 | 90 | 824 ± 111 | 3.79 ± 0.53 | 1.47 ± 0.08 | 0.38 ± 0.03 | 1.83 ± 0.19 | 0.91 ± 0.06 |
| 2014 Oct. 06.05 | 1.43 | 1.33 | 95 | 879 ± 112 | 3.40 ± 0.62 | 1.56 ± 0.07 | 0.39 ± 0.05 | 1.63 ± 0.17 | 0.99 ± 0.04 |
| 2014 Oct. 13.05 | 1.41 | 1.48 | 95 | 1040 ± 139 | 4.19 ± 0.48 | 1.51 ± 0.06 | 0.40 ± 0.03 | 2.72 ± 0.09 | 0.99 ± 0.03 |
| 2014 Oct. 17.03 | 1.40 | 1.57 | 94 | 2.14 ± 0.07 | |||||
| 2014 Oct. 19.04 | 1.40 | 1.61 | 93 | 3.74 ± 0.52 | 1.45 ± 0.06 | 1.02 ± 0.03 | |||
| 2014 Oct. 20.03 | 1.40 | 1.63 | 93 | 832 ± 137 | 4.08 ± 0.67 | 1.59 ± 0.07 | 0.41 ± 0.04 | 1.82 ± 0.14 | 1.06 ± 0.03 |
| 2014 Oct. 29.02 | 1.40 | 1.82 | 89 | 1040 ± 210 | 2.83 ± 0.13 | 2.67 ± 0.15 | 1.18 ± 0.05 | ||
| 2014 Nov. 07.02 | 1.41 | 2.00 | 84 | 5.60 ± 0.33 | 4.81 ± 0.45 | 3.07 ± 0.13 | |||
| 2014 Nov. 11.02 | 1.42 | 2.07 | 80 | 22.1 ± 1.4 | 28.9 ± 1.5 | 9.21 ± 0.42 | |||
| 2014 Nov. 12.01 | 1.42 | 2.09 | 79 | 9010 ± 3370 | 14.7 ± 1.2 | 3.69 ± 0.47 | 25.5 ± 1.7 | 10.10 ± 0.60 | |
| 2014 Nov. 13.02 | 1.43 | 2.10 | 78 | 10.1 ± 0.9 | 1.80 ± 0.38 | 14.0 ± 1.4 | 9.08 ± 0.55 | ||
| 2014 Nov. 14.02 | 1.43 | 2.12 | 77 | 7.84 ± 0.92 | 1.31 ± 0.40 | 12.2 ± 1.4 | 8.52 ± 0.65 | ||
| 2014 Nov. 15.01 | 1.43 | 2.13 | 76 | 6.77 ± 0.79 | 1.58 ± 0.38 | 9.90 ± 1.39 | 6.50 ± 0.54 | ||
Notes. r and Δ are respectively the heliocentric and geocentric distances (at 2 au one pixel represents about 2000 km). The date given in the first column is the mid-time of the observations.
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