728 Leonisis
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| Discovery A | |
|---|---|
| Discoverer | J. Palisa |
| Discovery date | February 16, 1912 |
| Alternate designations B |
1912 NU; A907 UE; 1941 WR; 1968 UT |
| Category | Main belt (Flora family) |
| Orbital elements C | |
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| Eccentricity (e) | 0.0873 |
| Semi-major axis (a) | 337.2 Gm (2.254 AU) |
| Perihelion (q) | 307.7 Gm (2.057 AU) |
| Aphelion (Q) | 366.7 Gm (2.451 AU) |
| Orbital period (P) | 1236.0 d (3.38 a) |
| Mean orbital speed | 19.80 km/s |
| Inclination (i) | 4.258° |
| Longitude of the ascending node (Ω) |
82.701° |
| Argument of perihelion (ω) |
55.194° |
| Mean anomaly (M) | 232.528° |
| Physical characteristics D | |
| Dimensions | unknown |
| Mass | unknown |
| Density | unknown |
| Surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | ~0.2 d (~5 h) [1] |
| Spectral class | A or Ld |
| Absolute magnitude | 12.8 |
| Albedo (geometric) | unknown |
| Mean surface temperature |
? |
728 Leonisis is an asteroid of the Flora family, discovered by J. Palisa in 1912 in Vienna. There is some uncertainty as to its spectral class. It has been previously placed in the rare A and Ld classes [2]. These are generally "stony" spectra, but with significant deviations from the usual S-type. The unusual spectrum brings Leonisis' membership in the Flora family into doubt.
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