Observations of Potentially Hazardous Asteroid 139622 (2001 QQ142)

In 2023–2024, astrometric and photometric observations of the potentially hazardous asteroid 139622 (2001 QQ142) were carried out using telescopes of the Main Astronomical Observatory of the Russian Academy of Sciences. A series of astrometric observations of the asteroid positions have been obtained, which have a root-mean-square accuracy of one observation for ZA-320M σ = ±0″.21 and for MTM-500M σ = ±0″.07. The evolution of its orbit and the circumstances of its close approaches to Earth were studied, and the influence of nongravitational effects on its motion was estimated. Based on photometric observations of the asteroid in the integral bands of the telescopes, a light curve was constructed, and its axial rotation period was refined: P = 17.0232 ± 0.0040 h.