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Discovery
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| Discovered by | Louis Boyer |
| Discovery date | June 26, 1936 |
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Designations
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| Named after | Henri Poincaré |
| Alternate name(s) | 1936 MA; 1968 UQ2; 1971 LE; 1975 TC3 |
| Minor planet category |
Main belt |
| Aphelion | 2.8164 AU |
| Perihelion | 1.8022 AU |
| Semi-major axis | 2.309 AU |
| Eccentricity | 0.2196 |
| Orbital period | 3.511 years |
| Average orbital speed | 19.60 km/s (0.2808 °/day) |
| Mean anomaly | 335.136 ° |
| Inclination | 5.4873 ° |
| Longitude of ascending node | 155.052 ° |
| Argument of perihelion | 164.072 ° |
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Physical characteristics
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| Dimensions | ~29.1 km |
| Mass | ?×10? kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | ? d |
| Albedo | ~0.068 |
| Temperature | ? K |
| Spectral type | ? |
| Absolute magnitude (H) | 13.206 |
2021 Poincaré is a main belt asteroid that was discovered by the French astronomer Louis Boyer on June 26, 1936 at Algiers. The asteroid is named after the French mathematician Henri Poincaré.
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