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Discovery[1] and designation
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|---|---|
| Discovered by | Karl Wilhelm Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | August 12, 1923 |
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Designations
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| MPC designation | 1923 NZ |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch August 27, 2011 (JD 2455800.5) | |
| Aphelion | 596.013 Gm (3.984 AU) |
| Perihelion | 352.737 Gm (2.358 AU) |
| Semi-major axis | 474.375 G m (3.171 AU) |
| Eccentricity | 0.256 |
| Orbital period | 2062.497 d (5.65 a) |
| Average orbital speed | 16.45 km/s |
| Mean anomaly | 219.144° |
| Inclination | 20.571° |
| Longitude of ascending node | 323.779° |
| Dimensions | 47.7 km |
| Mass | 1.1×1017 kg |
| Mean density | 2.0 g/cm³ |
| Equatorial surface gravity | 0.0133 m/s² |
| Equatorial escape velocity | 0.0252 km/s |
| Sidereal rotation period |
? d |
| Axial tilt | ?° |
| Pole ecliptic latitude | ? |
| Pole ecliptic longitude | ? |
| Geometric albedo | 0.10 |
| Temperature | ~156 K |
| Spectral type | ? |
| Absolute magnitude (H) | 9.6 |
1000 Piazzia, discovered in 1923, is a main-belt asteroid orbiting the Sun. It was the 1000th minor planet to be numbered, and was named in honour of Giuseppe Piazzi, who discovered the first asteroid, 1 Ceres.
Its radius is estimated to be 24 km, and measurements of its light curve by Robert D. Stephens in 2001 showed it to be rotating with a period of 9.47 hours.[1]
The planet Piazzia comes closest to is Mars. It draws nearer than 1.33 AU eleven times in the 20th and 21st centuries. Rarely, the two are closer than one AU. This last happened in 1638, and won't happen again for another 14,000 years.
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