(50739) Gracecook Main-belt Asteroid
Discovered on 11 March 2000 by CSS at Catalina.
A. Grace Cook (1877–1958) was a British astronomer, known as a skilled observer. After joining the British Astronomical Association, she observed the 1914 Mercury transit from her own observatory, and was elected a Fellow of the Royal Astronomical Society in 1916. Known for meteor and auroral observations, she received the E.C.Pickering Fellowship in 1920.Naming citation (WGSBN Bull. 3, #4, 7), IAU / Minor Planet Center, via NASA/JPL
Where Gracecook is today
Seen from above the solar system on 2026-10-14: Gracecook is 2.19 au from the Sun and 2.44 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 50739 |
| Provisional designation | 2000 EY156 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.75 km (#11,112 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.263 |
| Rotation period | 7.72 hours |
| Absolute magnitude (H) | 13.9 |
| Orbital period | 4.09 years |
| Semi-major axis | 2.56 au |
| Perihelion – aphelion | 1.98 – 3.14 au |
| Eccentricity | 0.228 |
| Inclination | 14.4° |
| Closest distance between its orbit and Earth's (MOID) | 1.02 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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