Discovery | |
---|---|
Discovered by | J. Palisa |
Discovery date | 16 February 1912 |
Designations | |
(728) Leonisis | |
Pronunciation | /liːəˈnaɪsɪs/ |
1912 NU; A907 UE; 1941 WR; 1968 UT | |
Main belt ( Flora family) | |
Orbital characteristics [1] | |
Epoch 31 July 2016 ( JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 103.98 yr (37979 d) |
Aphelion | 2.4509 AU (366.65 Gm) |
Perihelion | 2.0561 AU (307.59 Gm) |
2.2535 AU (337.12 Gm) | |
Eccentricity | 0.087584 |
3.38 yr (1235.6 d) | |
Average
orbital speed | 19.80 km/s |
317.487 ° | |
0° 17m 28.86s / day | |
Inclination | 4.2564° |
82.661° | |
55.396° | |
Physical characteristics | |
5.5783 h (0.23243 d) [1] [2] | |
A or Ld | |
13.0 | |
728 Leonisis is an asteroid of the Flora family, discovered by Austrian astronomer Johann Palisa on 16 February 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]