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The YORP effect can spin up very small asteroids to rotation times as short as tens of seconds. For that, spin axes of several other VSAs should be determined by observing their brightness variations at several different locations on the sky. A 30-m in diameter near-Earth asteroid 2021 DW 1 passed through the Earth at a distance of 570 000 km on March 4th, 2021 at 9 UTC, reaching the maximum brightness of V = 14. 6 mag. During the period 2021-2005, the DW 1 swept a 170° long arc in the northern sky, spanning solar phase angles from 36° to 86°. Convex's conversion of the asteroid lightcurves results in a sidereal period of rotation P sid = 0. 013760 0. 000001 h, with two options for the spin axis ecliptic coordinates: 57° 10°, 61° 10°, 1 = 57° ten°, 2 = 67° 10°; 2 = 67° 10°. With H = 24. 8 0. 5 mag and an assumed G = 0. 24, the magnitude-phase curve can be fitted with a standard H, G, G function with H = 24. 8 0. 5 mag and an assumed G = 0. 24. The asteroid colour indices are g 0. 79 0. 01 mag, and i 0. 02 0. 02 mag, indicating an S taxonomic class, with an average geometric albedo p V = 0. 23 0. 02. The spin axis of 2021 DW 1's inclination was not perpendicular to the orbital plane, according to the authors.
Source link: https://doi.org/10.1051/0004-6361/202142013
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