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Fig. 3


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Two stellar occultation predictions for (223) Rosa. The red line marks the 1 − σ cross-track uncertainty (about 24 km for both events). Minute time ticks are marked with yellow dots. The time of geocentric closest approach (c.a.) is marked by the red dot. Left-hand side: occultation of the star Gaia EDR3 0664382207483343488 on 2022 Oct. 7 at 05:27:31 UT (c.a.), visible in Portugal and Spain (though twilight will interfere in the eastern part of Spain). The star has G = 13.5 mag, the expected magnitude drop will be 2.0 mag, the maximum duration about 2.9 s. Right-hand side: occultation of the star Gaia EDR3 0661647103588763776 on 2023 Feb. 24 at 01:54:39 UT (c.a.), visible in the U.S. and northern Africa (Morocco, Algeria, etc.) The star has G = 13.9 mag, the expected magnitude drop will be 0.8 mag, and the maximum duration about 9.6 s.

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