1319 Disa
| Discovery [1] | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 19 March 1934 |
| Designations | |
| MPC designation | 1319 Disa |
|
Named after
|
Disa (orchid – flowering plant)[2] |
| 1934 FO · 1929 GE 1970 FM · A908 EA |
|
| main-belt · (outer) [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 107.58 yr (39,293 days) |
| Aphelion | 3.6025 AU |
| Perihelion | 2.3668 AU |
| 2.9847 AU | |
| Eccentricity | 0.2070 |
| 5.16 yr (1,883 days) | |
| 247.94° | |
| Inclination | 2.8002° |
| 256.19° | |
| 316.50° | |
| Physical characteristics | |
| Dimensions | 24.00±0.37 km[4] 25.894±0.180 km[5] 16.88±1.12 km[6] 42.23 km (calculated)[3] |
| 7.080 h[7] 7.082±0.001 h[8] 7.0820±0.0077 h[9] |
|
| 0.116±0.004[4] 0.0959±0.0034[5] 0.391±0.038[6] 0.057 (assumed)[3] |
|
| C [3] | |
| 10.6 | |
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1319 Disa, provisional designation 1934 FO, is an assumed carbonaceous asteroid from the outer region of the asteroid belt, about 25 kilometers in diameter. It was discovered by English-born, South African astronomer Cyril Jackson at the Union Observatory, Johannesburg, on 19 March 1934.[10]
The asteroid orbits the Sun at a distance of 2.4–3.6 AU once every 5 years and 2 months (1,883 days). Its orbit shows an eccentricity of 0.21 and is tilted by 3 degrees to the plane of the ecliptic. It has a well-defined rotation period of 7.08 hours.[7][8][9]
The asteroid is one of the cases, where the Collaborative Asteroid Lightcurve Link (CALL) strongly disagrees with the (interpreted) observational data collected by space-based mission. While publications based on results from the Akari and WISE satellites assign a geometric albedo of 0.10 and 0.11, including and outlier of 0.39, CALL assumes the body to be carbonaceous with an albedo of only 0.06. This leads to notable discrepancies for the body's derived size, where CALL calculates a significantly larger diameter of 42 kilometers, compared to the 17–26 kilometers from the published satellite surveys (also see infobox for an overview).[3][4][5][6]
The minor planet was named after Disa, also known as "African weed-orchid", a large genus of more than a hundred tropical orchids, common in southern Africa.[2]
References
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<references />, or <references group="..." />External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1319 Disa at the JPL Small-Body Database
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