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Home All issues Volume 631 (November 2019) A&A, 631 (2019) A168 Full HTML
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Table 1

Journal of VLT and TRAPPIST observations, and derived OH, CN, C2, and C3 production rates and A(θ = 0°)fρ parameter of comet 66P.

UT date Tel rh △ Production rates (1024 molecules s−1) A(θ = 0°)fρ (cm)
(au) (au) Q(OH) Q(CN) Q(C2) Q(C3) BC RC Rc Ic
2018-05-06.4 TRAPPIST 1.30 0.90 5.67 ± 0.55 4.65 ± 0.68
2018-05-16.4 TRAPPIST 1.29 0.90 2880 ± 297 8.59 ± 0.53 8.63 ± 0.70 2.67 ± 0.20 82.6 ± 6.3 108.0 ± 7.7 102.4 ± 6.3 98.6 ± 8.6
2018-05-23.4 TRAPPIST 1.29 0.90 2530 ± 298 8.00 ± 0.53 8.22 ± 0.64 2.43 ± 0.22 75.6 ± 5.7
2018-05-26.4 TRAPPIST 1.29 0.90 7.60 ± 0.52 7.78 ± 0.64 2.20 ± 0.21 70.8 ± 6.0 97.7 ± 6.1 76.7 ± 6.9 88.0 ± 8.6
2018-06-17.4 TRAPPIST 1.34 0.91 6.23 ± 0.56 3.40 ± 0.67 1.26 ± 0.23 46.9 ± 6.8 55.2 ± 7.4
2018-06-28.4 TRAPPIST 1.39 0.92 3.60 ± 0.56 3.85 ± 0.68
2018-07-02.3 VLT/UVES 1.42 0.92
2018-07-08.4 VLT/XSH 1.45 0.92 891 ± 280 2.15 ± 0.20 2.07 ± 0.20 1.92 ± 0.20
2018-07-13.4 TRAPPIST 1.48 0.92 1.65 ± 0.51 1.40 ± 0.62
2018-07-14.4 VLT/XSH 1.49 0.92 541 ± 230 1.53 ± 0.20 1.78 ± 0.20 1.26 ± 0.20

Notes. rh and △ are the heliocentric and geocentric distances, respectively. The A(0)fρ values are printed at 5000 km from the nucleus and they are corrected for the phase angle effect. The perihelion of 66P was on May 20, 2018 when the comet was at 1.28 au from the Sun and at 0.90 au from Earth.

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