Table 1
2020 October 23 occultation circumstances and target star data.
| Occultation parameter (NIMAv3 prediction) | |
|---|---|
| Date and time of closest approach (t0) | 2020-10-23 |
| 22:18:08 UT ±78 s | |
| Geocentric shadow velocity | 21.80 km/s |
| Magnitude drop | 6.6 mag |
| Maximum duration | 13.1 s |
| Apparent diameter of 2003 UY117 | 12 mas |
| Occulted star data (from Gaia DR2) | |
| Gaia DR2 source ID | 62553763421986304 |
| Proper motion (mas/yr) | µα* = +13.5 ± 0.1 |
| µδ = +0.5 ± 0.0 | |
| Position (ICRS, cat. epoch) | α = 03 23 26.2108 |
| δ =+2247 19.192 | |
| Position (ICRS, occ. epoch) | α = 03 23 26.2160 |
| δ=+2247 19.195 | |
| Position error (occ. epoch) | σα* = 0.3 mas |
| σδ = 0.3 mas | |
| G, RP, BP magnitudes | 14.54, 13.80, 15.17 |
| V, R, B magnitudes (from NOMAD) | 14.54, 14.27, 15.25 |
| J, H, K magnitudes (from NOMAD) | 12.84, 12.41, 12.22 |
| Occulted star data (from Gaia DR3) | |
| Proper motion (mas/yr) | µα* = +13.320 ± 0.049 |
| µδ = +0.388 ± 0.029 | |
| Position (ICRS, cat. epoch) | α = 03 23 26.2113 |
| δ=+2247 19.192 | |
| Position (ICRS, occ. epoch) | α = 03 23 26.2155 |
| δ=+2247 19.194 | |
| Position error (occ. epoch) | σα* = 0.24 mas |
| σδ = 0.14 mas | |
| RUWE | 1.05 |
| Duplicated source | false |
Notes. The maximum occultation duration (central line) and the apparent diameter of the TNO are given for an assumed size of D = 285 km. The V, R, B, J, H, and K magnitudes of the target star were taken from the NOMAD catalog (Zacharias et al. 2004). The renormalized unit weight error (RUWE) is a measure of the reliability of a singlestar model derived from observations. A value close to 1 is typically expected. Values exceeding 1.4 could indicate that the source is not a single star or that there are problems with the astrometric solution. The duplicated source flag also indicates that multiple sources were obtained during data processing6.
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