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Table 6

Properties of the comets and results of the HCN modelling.

Comet Rh rc ve Tc QHCN
(au) (au) (km) (km s−1) (K) (mol s−1) (mol s−1) (%)
C/2016U1 (NEOWISE) 0.50 0.90 1.0 1.1 70 <7.8 × 1025
45P/Honda-Mrkos-Pajdušáková 0.88 0.12 0.4(a) 0.8 70 2 × 1027 (b) <3.2 × 1024 <0.16
2P/Encke 0.38 0.70 2.2 (c) 1.3 70 (d) 3 × 1028 (d) <2.2 × 1026 <0.7
41P/Tuttle-Giacobini-Kresák 1.05 0.15 0.6 (e) 0.8 70 3.5 × 1027 (f) (4.5 ± 1.0) × 1024 0.13 ± 0.03
C/2015 ER61 (PanSTARRS) 1.10 1.22 0.94 (c) 0.7 70 (g) 1 × 1029 (g) (8.2 ± 2.1) × 1025 0.082 ± 0.021
C/2017 E4 (Lovejoy) 0.63 0.67 1.0 1.0 70 3 × 1028 (h) <6.3 × 1025 <0.21
C/2015 V2 (Johnson) 1.67 0.87 1.7 (c) 0.6 60 4 × 1028 (i) (3.5 ± 0.9) × 1025 0.088 ± 0.022
46P/Wirtanen (2018-12-20) 1.06 0.08 0.7 (j) 0.55 70 (k) 1.6 × 1028 (j) (1.6 ± 0.1) × 1025 0.10 ± 0.01
8 × 1027 (l) (1.5 ± 0.1) × 1025 0.19 ± 0.02
C/2017 O1 (ASASSN1) 1.50 0.72 0.92 (c) 0.6 60 (2.2 ± 0.2) × 1025
C/2018 Y1 (Iwamoto) 1.30 0.42 1.0 0.55 60 2.1 × 1028 (m) (2.2 ± 0.2) × 1025 0.10 ± 0.02
2I/Borisov 2.10 2.40 1.0 0.55 50 (n) 6.5 × 1026 (n) <6.3 × 1024 <1.0

References. (a)From Combi et al. (2019). (b)From Dello Russo et al. (2020). (c)Comet radius from Paradowski (2020).(d)From Roth et al. (2018). (e)See Howell et al. (2017) and Boehnhardt et al. (2020).(f) April 2017 average from Moulane et al. (2018).(g) Adapted from Saki et al. (2021). (h)From Faggi et al. (2018). (i)From Combi et al. (2021).(j) Adapted from Combi et al. (2020). (k)Estimated from the CH3OH data in this paper. (l)Based on IR spectroscopy data (Bonev et al. 2021). See also Lis et al. (2019). (m)Preliminary data by DiSanti et al. (2019). (n)Adapted from Cordiner et al. (2020).

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