1000 Piazzia

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1000 Piazzia
1000 Piazzia's orbit (blue), planetary orbits (red) and the Sun (black). The outermost orbit shown is Jupiter's.
Discovery[1] and designation
Discovered by Karl Wilhelm Reinmuth
Discovery site Heidelberg
Discovery date August 12, 1923
MPC designation 1923 NZ
Main belt
Orbital characteristics[2]
Epoch August 27, 2011 (JD 2455800.5)
Aphelion 596.013 Gm (3.984 AU)
Perihelion 352.737 Gm (2.358 AU)
474.375 G m (3.171 AU)
Eccentricity 0.256
2062.497 d (5.65 a)
16.45 km/s
Inclination 20.571°
Physical characteristics
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
? d
Temperature ~156 K

1000 Piazzia is a main-belt asteroid, discovered in 1923. 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 (15 mi), 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.[citation needed]

See also[edit]


  1. ^ Stephens, Robert D. (2001). "Rotational Periods and Lightcurves of 1096 Reunerta and 1000 Piazzia". Minor Planets Bulletin 28: 56. Bibcode:2001MPBu...28...56S.