| Minorplanet: | yes |
| 3066 McFadden | |
| Background: |
|
| Discovery Ref: |   |
| Discovered: | 1 March 1984 |
| Mpc Name: | (3066) McFadden |
| Alt Names: | 1984 EO1933 MA 1936 FE1941 MA 1952 FW1968 FQ 1976 GC |
| Named After: | Lucy-Ann McFadden  |
| Mp Category: | background  |
| Orbit Ref: |   |
| Epoch: | 23 March 2018 (JD 2458200.5) |
| Uncertainty: | 0 |
| Observation Arc: | 81.60 yr (29,806 d) |
| Perihelion: | 2.1875 AU |
| Semimajor: | 2.5255 AU |
| Eccentricity: | 0.1339 |
| Period: | 4.01 yr (1,466 d) |
| Mean Motion: | / day |
| Inclination: | 15.574° |
| Asc Node: | 175.69° |
| Arg Peri: | 188.31° |
| Mean Diameter: | |
| Albedo: | |
| Abs Magnitude: | 11.1011.20 11.24 |
3066 McFadden, provisional designation , is a stony background asteroid from the central regions of the asteroid belt, approximately 15abbr=offNaNabbr=off in diameter. It was discovered on 1 March 1984, by American astronomer Edward Bowell at the Anderson Mesa Station near Tucson, Arizona. It was named for American planetary scientist Lucy-Ann McFadden. The assumed S-type asteroid has a rotation period of 13.8 hours.
McFadden is a non-family asteroid from the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 2.2–2.9 AU once every 4 years (1,466 days; semi-major axis of 2.53 AU). Its orbit has an eccentricity of 0.13 and an inclination of 16° with respect to the ecliptic.
The asteroid was first observed as at the Simeis Observatory in June 1933. The body's observation arc begins as at Uccle Observatory in March 1936, or 48 years prior to its official discovery observation at Anderson Mesa.
This minor planet was named after Lucy-Ann McFadden (born 1952), a planetary scientist at the University of Maryland at the time of naming. Her research included the similarities between the spectra of meteorites and near-Earth objects. The official naming citation was published by the Minor Planet Center on 14 April 1987 .
McFadden is an assumed, stony S-type asteroid.
In June 2005, a rotational lightcurve of McFadden was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave a rotation period of 13.798 hours with a brightness amplitude of 0.13 magnitude .
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, McFadden measures between 13.526 and 15.63 kilometers in diameter and its surface has an albedo between 0.240 and 0.363.
The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE data with an albedo of 0.2541 and a diameter of 14.90 kilometers based on an absolute magnitude of 11.24.