Table 1
Parameters of the HST observations.
| N | Date | DOY16 | rh | Δ | α | PA−⊙ | PA−v | ɛ | long | lat | ν |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 2011-Dec.-07 | –1484.75 | 2.53 | 1.76 | 16.47 | 66.44 | 247.41 | 0.26 | 28.02 | –2.94 | 39.25 |
| B | 2011-Dec.-15 | –1476.15 | 2.54 | 1.85 | 18.44 | 67.33 | 247.36 | 0.01 | 28.15 | –2.67 | 41.51 |
| 1 | 2016-Aug.-22 | 235.16 | 2.47 | 1.50 | 8.95 | 259.53 | 246.55 | 2.00 | 351.19 | 5.23 | 337.94 |
| 2 | 2016-Sep.-01 | 245.67 | 2.46 | 1.46 | 4.54 | 275.56 | 246.88 | 2.17 | 349.36 | –5.41 | 340.72 |
| 3 | 2016-Sep.-09 | 253.50 | 2.45 | 1.45 | 2.25 | 330.82 | 247.19 | 2.24 | 347.81 | –5.46 | 342.96 |
| 4 | 2016-Sep.-20 | 264.16 | 2.45 | 1.46 | 5.33 | 42.83 | 247.64 | 2.22 | 345.69 | –5.43 | 346.05 |
| 5 | 2016-Sep.-29 | 273.33 | 2.44 | 1.49 | 9.23 | 54.45 | 248.00 | 2.12 | 344.13 | –5.32 | 348.59 |
| 6 | 2016-Oct.-26 | 300.83 | 2.44 | 1.69 | 18.65 | 63.63 | 248.43 | 1.45 | 342.31 | –4.63 | 356.23 |
| 7 (a) | 2016-Nov.-04 | 309.60 | 2.44 | 1.78 | 20.61 | 64.73 | 248.31 | 1.18 | 342.83 | –4.36 | 358.79 |
| 8 | 2016-Nov.-13 | 318.42 | 2.44 | 1.88 | 22.06 | 65.50 | 248.08 | 0.90 | 343.87 | –4.10 | 1.35 |
| 9 | 2016-Dec.-14 | 349.50 | 2.44 | 2.27 | 23.74 | 66.83 | 246.86 | 0.01 | 351.00 | –3.25 | 10.14 |
| 10 | 2016-Dec.-26 | 361.40 | 2.45 | 2.42 | 23.29 | 67.12 | 246.40 | –0.27 | 354.83 | –2.97 | 13.52 |
| 11 | 2017-Jan.-17 | 383.46 | 2.46 | 2.70 | 21.35 | 67.74 | 245.83 | –0.66 | 2.92 | –2.54 | 19.69 |
| 12 | 2017-Jan.-30 | 396.23 | 2.47 | 2.85 | 19.70 | 68.26 | 245.74 | –0.82 | 8.16 | –2.31 | 23.30 |
| 13 | 2017-Aug.-24 | 602.63 | 2.78 | 3.23 | 17.33 | 272.62 | 269.11 | 0.94 | 96.43 | –0.20 | 74.73 |
| 14 | 2017-Nov.-10 | 680.19 | 2.93 | 2.38 | 17.84 | 279.25 | 276.38 | 0.78 | 113.15 | 0.82 | 90.88 |
| 16 (b) | 2018-Jan.-31 | 762.50 | 3.10 | 2.21 | 9.22 | 98.41 | 271.81 | –1.08 | 101.42 | 2.08 | 106.11 |
| 17 | 2018-Feb.-27 | 789.50 | 3.15 | 2.52 | 15.60 | 95.35 | 270.86 | –1.23 | 99.52 | 2.13 | 110.78 |
| 18 | 2018-May-07 | 858.31 | 3.27 | 3.59 | 16.04 | 97.62 | 275.68 | –0.54 | 110.32 | 2.02 | 122.07 |
| 19 | 2018-Nov.-13 | 1048.13 | 3.54 | 3.89 | 14.36 | 294.55 | 292.63 | 0.44 | 168.25 | 2.78 | 149.58 |
| 20 | 2018-Dec.-22 | 1087.15 | 3.57 | 3.35 | 15.91 | 293.13 | 293.57 | –0.12 | 175.02 | 3.35 | 154.79 |
| 21 | 2019-Jan.-25 | 1121.73 | 3.60 | 2.89 | 12.18 | 290.19 | 293.84 | –0.74 | 175.86 | 3.96 | 159.25 |
| 22 | 2019-Feb.-16 | 1143.40 | 3.62 | 2.70 | 6.95 | 284.65 | 293.63 | –1.07 | 173.38 | 4.30 | 162.10 |
| 23 | 2019-May-17 | 1233.55 | 3.65 | 3.24 | 15.41 | 113.70 | 291.92 | –0.46 | 162.51 | 3.64 | 173.64 |
| 24 (c) | 2020-May-11 | 1593.83 | 3.45 | 2.45 | 2.86 | 124.28 | 289.96 | –0.71 | 222.16 | 2.84 | 220.63 |
Notes. N is the sequence number of the observation, rh and Δ are the heliocentric and geocentric distances in AU, α is the phase angle, PA−⊙ and PA−v are the position angles of the anti-solar direction and of the projected negative orbital velocity vector, ɛ is the angle between the line of sight and the heliocentric orbital plane of 288P, long and lat are the observer-centred ecliptic longitude and latitude, and ν is the true anomaly angle. All angles are in degrees. (a)The perihelion was on 2016-Nov.-09, between visits 7 and 8. (b)Visit 15 suffered from a problem with guide star acquisition with the result that 288P is trailed in the images at a time-dependent rate. The data were excluded from further analysis. (c) Visit 24 observations were obtained between UT 2020-May-11 04:07 and 2020-May-12 12:47. The data given in this table refer to UT 2020-May-11 20:00.
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