Photometry and model of near-Earth asteroid 2021 DW1 from one apparition

On 4 March 2021 at 9 UTC a 30-m in diameter near-Earth asteroid DW1 passed the Earth distance of 570000 km, reaching maximum brightness V=14.6 mag. We observed it photometrically from 2 March, when was visible V=16.5 mag, until 7 (V=18.2 mag). During that time swept 170 degrees long arc northern sky, spanning solar phase angles range 36 to 86 degrees. This made an excellent target for physical characterisation, including spin axis and shape derivation. Convex inversion lightcurves gives sidereal period rotation P=0.013760 +/- 0.000001 h, two solutions ecliptic coordinates: (A) lambda_1=57 10, beta_1=29 (B) lambda_2=67 beta_2=-40 10. The magnitude-phase curve can be fitted with standard H, G function H=24.8 0.5 mag assumed G=0.24. colour indices are g-i=0.79 0.01 i-z=0.01 0.02 which indicates S taxonomic class, average geometric albedo p_V=0.23 0.02. effective diameter, derived H p_V, is D=30 10 m. It found inclination not perpendicular orbital plane (obliquity epsilon=54 or epsilon=123 10). More axes VSAs should determined check, if exception typical case.