Determine the rotation period of asteroid 1992 JB

Determine the unambiguous rotation period of near-Earth asteroid 1992 JB from additional time-resolved photometry, resolving whether the observed semiperiod corresponds to a complete rotation period of approximately seven hours.

Background

Asteroid 1992 JB was observed in two dense photometric sessions totaling several hours, but the temporal coverage was insufficient to establish a unique period solution.

The authors report a possible semiperiod of 3.4 hours, which would imply a complete period of about 7 hours under a double-peaked lightcurve assumption. The period remains unresolved because the available observations do not provide an unambiguous lightcurve repetition.

References

Unfortunately, the two dense photometric sessions were not sufficient to unambiguously determine the rotation period. The semi-period could be 3.4 hours, in which case the complete rotation period, assuming a lightcurve with two maxima and two minima, would be about 7 hours.

— Photometric characterization of near-Earth asteroids: rotation, taxonomy, and candidate evidence for internal cohesion  (2609.02563 - Carbognani et al., 2 Sep 2026) in Appendix, subsection “(9058) 1992 JB”