728 Leonisis
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| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery date | February 16, 1912 |
| Designations | |
| Alternative names |
1912 NU; A907 UE; 1941 WR; 1968 UT |
| Minor planet category | Main belt (Flora family) |
| Orbital characteristics[1] | |
| Epoch August 8, 2005 (JD 2453600.5) | |
| Aphelion | 366.7 Gm (2.451 AU) |
| Perihelion | 307.7 Gm (2.057 AU) |
| Semi-major axis | 337.2 Gm (2.254 AU) |
| Eccentricity | 0.0873 |
| Orbital period | 1,236.0 d (3.38 a) |
| Average orbital speed | 19.80 km/s |
| Mean anomaly | 232.528° |
| Inclination | 4.258° |
| Longitude of ascending node | 82.701° |
| Argument of perihelion | 55.194° |
| Physical characteristics | |
| Rotation period | 5.5783[2] h |
| Spectral type | A or Ld |
| Absolute magnitude (H) | 12.8 |
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728 Leonisis is an asteroid of the Flora family, discovered by Austrian astronomer Johann Palisa on February 16, 1912 from Vienna.[3]
There is some uncertainty as to its spectral class. It has been previously placed in the rare A and Ld classes.[4] 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.
Photometric observations of this asteroid from the Organ Mesa Observatory in Las Cruces, New Mexico during 2010 gave a light curve with a period of 5.5783 ± 0.0002 hours and a brightness variation of 0.20 ± 0.04 magnitude.[2]
References
- ↑ Yeomans, Donald K., "728 Leonisis", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-04-07.
- ↑ 2.0 2.1 Pilcher, Frederick (July 2010), "Period Determinations for 11 Parthenope, 35 Leukothea, 38 Leda, 111 Ate, 194 Prokne, 262 Valda, 728 Leonisis, and 747 Winchester", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 37 (3): 119–122, Bibcode:2010MPBu...37..119P.
- ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ↑
External links
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