728 Leonisis

728 Leonisis is an asteroid of the Flora family, discovered by Austrian astronomer Johann Palisa on 16 February 1912 from Vienna.[3]

728 Leonisis
Discovery
Discovered byJ. Palisa
Discovery date16 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 arc103.98 yr (37979 d)
Aphelion2.4509 AU (366.65 Gm)
Perihelion2.0561 AU (307.59 Gm)
2.2535 AU (337.12 Gm)
Eccentricity0.087584
3.38 yr (1235.6 d)
19.80 km/s
317.487°
0° 17m 28.86s / day
Inclination4.2564°
82.661°
55.396°
Physical characteristics
5.5783 h (0.23243 d)[1][2]
A or Ld
13.0

    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
    1. Yeomans, Donald K., "728 Leonisis", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 5 May 2016.
    2. Pilcher, Frederick (July 2010), "Period Determinations for 11 Parthenope, 35 Leukothea, 38 Leda, 111 Ate, 194 Prokne, 262 Valda, 728 Leonisis, and 747 Winchester", The Minor Planet Bulletin, vol. 37, no. 3, pp. 119–122, Bibcode:2010MPBu...37..119P.
    3. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    4. "Asteroid Taxonomy". Archived from the original on 17 January 2010. Retrieved 27 December 2008.


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