Astronomy:728 Leonisis
From HandWiki
| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery date | 16 February 1912 |
| Designations | |
| (728) Leonisis | |
| Pronunciation | /liːəˈnaɪsɪs/ |
| 1912 NU; A907 UE; 1941 WR; 1968 UT | |
| Minor planet category | Main belt (Flora family) |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 103.98 yr (37979 d) |
| |{{{apsis}}}|helion}} | 2.4509 astronomical unit|AU (366.65 Gm) |
| |{{{apsis}}}|helion}} | 2.0561 AU (307.59 Gm) |
| 2.2535 AU (337.12 Gm) | |
| Eccentricity | 0.087584 |
| Orbital period | 3.38 yr (1235.6 d) |
| Average Orbital speed | 19.80 km/s |
| Mean anomaly | 317.487° |
| Mean motion | 0° 17m 28.86s / day |
| Inclination | 4.2564° |
| Longitude of ascending node | 82.661° |
| 55.396° | |
| Physical characteristics | |
| Rotation period | 5.5783 h (0.23243 d)[1][2] |
| A or Ld | |
| Absolute magnitude (H) | 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]
References
- ↑ 1.0 1.1 Yeomans, Donald K., "728 Leonisis", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=728, retrieved 5 May 2016.
- ↑ 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", The Minor Planet Bulletin 37 (3): pp. 119–122, Bibcode: 2010MPBu...37..119P.
- ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html, retrieved 2013-04-07.
- ↑ "Asteroid Taxonomy". http://www.psi.edu/pds/resource/taxonomy.html.
External links
- 728 Leonisis at AstDyS-2, Asteroids—Dynamic Site
- 728 Leonisis at the JPL Small-Body Database
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