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Table 1.

Observation log.

Date 2017 (UT)a rhb (au) Δc (au) Days to perihelion Resolutiond (km pixel−1) Dimensione (pixels2) Phase Angle (°) A f ρf (cm) Telescopeg
(1†) January 20, 04:20 −1.493 0.536 −82.5 995.5 40 14.6 5.6 ± 1.1 TS
(2) January 30, 03:53 −1.410 0.432 −72.6 802.1 40 8.4 10.4 ± 2.1 TS
(3) February 5, 04:16 −1.363 0.378 −66.5 701.8 60 3.9 13.8 ± 2.7 TS
(4) February 16, 21:04 −1.274 0.289 −54.8 536.6 100 6.8 20.8 ± 4.1 TN
(5) February 19, 02:00 −1.258 0.274 −52.6 508.7 125 9.3 22.0 ± 4.4 TN
(6) February 25, 00:15 −1.218 0.239 −46.7 443.9 125 15.8 24.8 ± 4.9 TN
(7†) February 25, 04:22 −1.217 0.238 −46.5 441.9 125 16.0 25.8 ± 5.1 TS
(8) March 01, 21:42 −1.186 0.214 −41.8 397.3 150 21.9 21.1 ± 4.2 TN
(9) March 11, 20:00 −1.130 0.175 −31.9 324.4 100 35.5 18.6 ± 3.7 TN
(10†) March 14, 20:03 −1.116 0.165 −28.9 306.3 150 39.7 25.8 ± 5.1 TN
(11†) March 26, 01:03 −1.072 0.144 −17.7 267.4 200 55.4 27.5 ± 5.5 TN
(12) March 26, 22:46 −1.069 0.144 −16.8 267.4 200 56.5 29.6 ± 5.9 TN
(13) March 28, 02:19 −1.066 0.143 −15.6 265.5 175 56.7 26.4 ± 5.2 TN
(14) March 29, 23:52 −1.061 0.142 −13.7 263.6 150 61.2 26.2 ± 5.2 TN
(15) March 30, 22:31 −1.059 0.142 −12.8 263.6 150 61.2 26.3 ± 5.2 TN
(16) April 01, 01:37 −1.057 0.142 −11.6 263.6 175 62.3 24.5 ± 4.9 TN
(17) April 03, 21:01 −1.052 0.142 −8.8 263.6 150 64.9 23.6 ± 4.7 TN
(18†) April 07, 23:12 −1.047 0.145 −4.8 269.2 150 67.8 23.0 ± 5.0 TN
(19) April 12, 23:52 1.045 0.152 0.2 282.2 150 69.7 23.6 ± 5.2 TN
(20) April 19, 22:56 1.049 0.165 7.5 306.3 150 69.7 25.3 ± 5.0 TN
(21†) April 21, 23:41 1.052 0.169 9.2 313.8 150 69.3 26.3 ± 5.2 TN
(22) April 26, 04:49 1.061 0.179 13.4 332.3 150 67.6 28.3 ± 5.6 TN
(23) April 27, 22:58 1.065 0.184 15.2 341.6 150 66.6 28.7 ± 5.7 TN
(24†) May 02, 23:59 1.080 0.197 20.2 365.7 130 63.4 27.3 ± 5.4 TN
(25†) June 07, 03:12 1.278 0.319 55.3 592.3 60 30.3 23.0 ± 4.6 TN
(26) June 11, 04:34 1.308 0.339 59.4 629.4 60 26.5 21.6 ± 4.3 TN
(27) June 22,00:30 1.392 0.403 70.2 374.1 100 18.1 24.7 ± 4.9 TN
(28†) June 29, 02:50 1.450 0.455 77.3 422.4 100 14.9 19.7 ± 3.9 TN
(29) July 20, 20:00 1.633 0.665 99.0 617.3 50 17.0 10.5 ± 2.1 TN
(30†) July 27, 23:27 1.695 0.752 106.2 698.1 50 19.2 8.9 ± 1.7 TN

Notes.

(a)

Dates marked with a † are used for comparison with the model in Fig. 8.

(b)

Heliocentric distance. Negative values correspond to pre-perihelion, positive values to post-perihelion.

(c)

Geocentric distance.

(d)

Resolution of the images in Fig. 1.

(e)

Dimensions of the images in Fig. 1.

(f)

ρ = 104 km.

(g)

TS corresponds to TRAPPIST-South, TN to TRAPPIST-North.

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