Table 1.
Particle Event Data Set, Parameter Estimates, and Event Energies for Three Major Events
| 19 January 2019 | 11 February 2019 | 19 April 2019 | |||||
|---|---|---|---|---|---|---|---|
| Number of particles analyzed | Fit | 24 | 25 | 18 | |||
| Rejected | 11 | 5 | 0 | ||||
| Total | 35 | 30 | 18 | ||||
| Estimated value | Uncertainty (1‐sigma) | Estimated value | Uncertainty (1‐sigma) | Estimated value | Uncertainty (1‐sigma) | ||
|---|---|---|---|---|---|---|---|
| Event time (UTC) | 00:53:41 | 4 s | 23:27:28 | 6 s | 01:58:08 | 32 s | |
| Longitude (°) | −24.60 | 0.09 | 60.17 | 0.08 | −134.85 | 2.52 | |
| Latitude (°) | 20.63 | 0.30 | 20.68 | 0.37 | 18.60 | 1.03 | |
| Local solar time | 16:38:01 | 23 s | 18:05:31 | 22 s | 16:34:54 | 685 s | |
| Event energy (mJ) | Min a | 0.04 | 0.03 | 0.17 | |||
| Mean a | 0.80 | 0.26 | 1.24 | ||||
| Max a | 6.53 | 2.70 | 11.03 | ||||
| Cumulative | 19.17 | 6.48 | 22.28 | ||||
Note. Event reconstruction assumes that all the particles left the surface at the same time during the ejection event. Energy estimates per particle are based on the estimated body‐fixed velocity assuming a 3‐cm‐diameter sphere (Lauretta et al., 2019) with a density of 2 g/cm3 (based on Bennu meteorite analog; Hamilton et al., 2019).
a
Energies are computed on a per particle basis.