Approximately 3.4 kilometers in diameter, it was discovered on 28 July 1968 by astronomers at the Félix Aguilar Observatory in El Leoncito, Argentina.
[4] Feinstein orbits the Sun in the inner main-belt at a distance of 1.7–2.9 AU once every 3 years and 5 months (1,257 days).
[2] Feinstein has been characterized as a common stony S-type asteroid by PanSTARRS photometric survey,[5] which agrees with the family's overall spectral type.
[6]: 23 In May 2016, a rotational lightcurve of Feinstein was obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory.
Lightcurve analysis gave a short rotation period of 2.6723 hours with a brightness amplitude of 0.11 magnitude (U=3-).