Lightcurves of Near-Earth Asteroids 2024 ON, 2024 MK and 1998 ST27 As Observed From TRAPPIST

We report photometric observations of three near-Earth asteroids: 2024 ON, 2024 MK, and 1998 ST27. The observations were performed between June and October 2024 during their close approaches to Earth using the TRAPPIST network. Applying lightcurve analysis, we determined that the rotation period and amplitude of 2024 ON are P = 6.0116 ± 0.0003 h and A = 0.94 ± 0.05 mag. For 2024 MK we found two possible rotation periods. In the first case P1 = 0.5028 ± 0.0001 h with A1= 0.67 mag ± 0.02, and P2 = 0.3663 ± 0.0001 h with A2 = 0.45 mag ± 0.02. In the second case P1 = 0.7301 ± 0.0011 h with A1 = 0.503 mag, and P2 = 0.5031 ± 0.0005 h with A2 = 0.643 mag. For 1998 ST27 we obtain P = 3.56 ± 0.02 h and A= 0.07 ± 0.01 mag. All measurements have been submitted to the ALCDEF database.