Open Access
Table 2
Occultation circumstances.
| Occultation prediction from NIMAv6 | |
|---|---|
| Date and time at geocentric close approach | September 10, 2018, 03:38:37 ± 117 s UT |
| Uncertainty on Varda position (RA and Dec) | Δαcos(δ) = 43.4 mas, Δδ = 37.4 mas |
| Along-track uncertainty | 1274 km (37.6 mas) |
| Across-track uncertainty | 1460 km (43.1 mas) |
| Geocentric shadow velocity | 10.86 km s−1 |
| Maximum expected duration and magnitude drop | 66.7 s, 5.6 mag |
| Geocentric closest approach Varda-star | (85 ± 43) mas |
| Occulted star (from Gaia-DR2) | |
| Star source ID (stellar catalogue) | 4367203805493754752 |
| Geocentric star position (J2000) at the epoch | α = 17 : 18 : 25.12481 ± 0.2 mas, δ = −02 : 05 : 14.4282 ± 0.1 mas |
| G-mag/RP magnitude (mag) | 14.7/13.8 |
| Stellar diameter projected at the Varda distance | 0.82 km |
| Varda at occultation epoch | |
| Geocentric distance Δ | 46.6335 AU |
| Apparent diameter (physical diameter) | 21.4 mas (724 km) |
| Apparent bf V. magnitude | 20.3 |
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