Table 1
Geometrical parameters of Gemini South and Keck II observations.
| Date 2015 May | Instrument | N | rh (AU) | ∆ (AU) | α (°) | λ (°) | β (°) | ϵ (°) | ϕ (°) |
|---|---|---|---|---|---|---|---|---|---|
| 21.074–21.297 | GMOS | 138 | 3.2611 | 2.2527 | 1.83 | 245.51 | 1.58 | −0.58 | 239.15 |
| 21.297–21.317 | GMOS+DEIMOS | 13+21 | 3.2609 | 2.2523 | 1.79 | 245.49 | 1.58 | −0.58 | 239.17 |
| 21.317–21.547 | DEIMOS | 234 | 3.2606 | 2.2519 | 1.75 | 245.46 | 1.57 | −0.58 | 239.19 |
| 22.281–22.350 | GMOS | 38 | 3.2591 | 2.2491 | 1.45 | 245.29 | 1.56 | −0.56 | 239.33 |
Notes. N is the number of frames obtained by a given instrument during the time interval, rh and ∆ are the heliocentric and geocentric distances of 288P, α is the Sun-target-Earth (phase angle), λ and β are the geocentric ecliptic longitude and latitude, ϵ is the angle between the line of sight towards the centre of the Earth and the heliocentric orbital plane of the asteroid (a negative value indicates that the Earth centre is below the orbital plane of the object), and ϕ is the true anomaly angle. All parameters correspond to the middle of the time intervals.
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