Table 4
QCO/QHCN abundance ratios measured in CO-rich comets.
| Comet |  (au) |
QCO/QHCN | References |
|---|---|---|---|
| C/2023 H2 | 1.02 | 63 ± 19 | This work |
| C/1996 B2 (Hyakutake) | 0.65 | 98 ± 18 | (1) |
| C/1995 O1 (Hale-Bopp) | 0.9 | 73 ± 4 | (2) |
| C/2001 Q4 (NEAT) | 1.0 | 31 ± 8 | (3) |
| C/1999 T1 (McNaught-Hartley) | 1.3 | 87 ± 25 | (4) |
| C/2013 R1 (Lovejoy) | 1.3 | 33 ± 3 | (4) |
| C/2009 P1 (Garrad) | 1.6-2.1 | 36±9 | (2,4,5) |
| C/2010 G2 (Hill) | 2.5 | 82 ± 22 | (6) |
| C/2016 R2 (PANSTARRS) | 2.9 | >5000 | (7) |
| C/1995 O1 (Hale-Bopp) | 3 | 125-650 | (8) |
| C/2006 W3 (Christensen) | 3.2 | 240 | (9) |
| 2I/Borisov | 2.01 | 629 | (10) |
| Weighted Average CO-normal-to-depleted(b) | 0.5-2.5 | 6.4 ± 0.4 | (2,4) |
| Weighted Average CO-enriched(c) | 0.5-2.5 | 57 ± 0.6 | (2,4) |
Notes. (a) Heliocentric distance; (b) obtained considering 11 Oort Cloud comets observed within 2 au from the Sun that showed a CO abundances with respect to water lower than 7.7% (data from Lippi et al. 2021; Dello Russo et al. 2016, and references therein); (c) obtained considering six Oort Cloud comets observed within 2 au from the Sun that showed a CO abundances with respect to water higher than 7.7% (data from Lippi et al. 2021; Dello Russo et al. 2016, and references therein).
References. (1) DiSanti et al. (2003); (2) Dello Russo et al. (2016) and references therein; (3) de Val-Borro et al. (2013); (4) Lippi et al. (2021); (5) Paganini et al. (2012); (6) Kawakita et al. (2014); (7) McKay et al. (2019); (8) Biver et al. (2002); (9) Bockelée-Morvan et al. (2010); (10) Cordiner et al. (2020).
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