Table 2
CN and C2 production rates of C/2013 A1 (Siding Spring) from VLT/FORS 2 observations.
| UT Date | r | Δ | Sun PA | Slit PA | Production rates (1025 mol/s) | |
| (au) | (au) | (deg) | (deg) | Q(CN) | Q(C2) | |
|
|
||||||
| 2014 Jul. 25.38 | 1.91 | 1.65 | 245 | 206 | 1.33 ± 0.34 | 1.29 ± 0.18 |
| 2014 Aug. 1.38 | 1.85 | 1.46 | 251 | 195 | 1.35 ± 0.26 | 1.29 ± 0.16 |
| 2014 Aug. 29.17 | 1.62 | 0.92 | 320 | 256 | 1.42 ± 0.26 | 1.41 ± 0.04 |
| 2014 Aug. 31.05 | 1.61 | 0.91 | 334 | 256 | 1.25 ± 0.16 | 1.43 ± 0.14 |
| 2014 Sep. 19.01 | 1.49 | 1.00 | 84 | 180 | 1.22 ± 0.10 | 1.65 ± 0.10 |
Notes. r and Δ are respectively the heliocentric and geocentric distances (at 2 au one pixel represents about 400 km). The date given in the first column is the mid-time of the observations.
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