Astronomy:198 Ampella
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | A. Borrelly, 1879 |
| Discovery date | 13 June 1879 |
| Designations | |
| (198) Ampella | |
| Pronunciation | /æmˈpɛlə/ |
| Named after | Ampelos |
| A879 LA; 1957 YA1 | |
| Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 131.26 yr (47944 d) |
| |{{{apsis}}}|helion}} | 3.0193 astronomical unit|AU (451.68 Gm) |
| |{{{apsis}}}|helion}} | 1.8986 AU (284.03 Gm) |
| 2.4589 AU (367.85 Gm) | |
| Eccentricity | 0.22788 |
| Orbital period | 3.86 yr (1408.4 d) |
| Mean anomaly | 131.10° |
| Mean motion | 0° 15m 20.196s / day |
| Inclination | 9.3113° |
| Longitude of ascending node | 268.45° |
| 88.586° | |
| Earth MOID | 0.921007 AU (137.7807 Gm) |
| Jupiter MOID | 2.52287 AU (377.416 Gm) |
| TJupiter | 3.437 |
| Physical characteristics | |
| Mean radius | 28.58±1.4 km |
| Rotation period | 10.379 h (0.4325 d) |
| Geometric albedo | 0.2517±0.027 |
| S | |
| Absolute magnitude (H) | 8.33 |
Ampella (minor planet designation: 198 Ampella) is a Main belt asteroid that was discovered by Alphonse Borrelly on June 13, 1879. The name seems to be the feminine form of Ampelos, a satyr and good friend of Dionysus in Greek mythology. It could also derive from the Ampelose (plural of Ampelos), a variety of hamadryad. It is an S-type asteroid.
So far Ampella has been observed occulting a star once, on November 8, 1991, from New South Wales, Australia.
This asteroid has been resolved by the W. M. Keck Observatory, resulting in a size estimate of 53 km. It is oblate in shape, with a size ratio of 1.22 between the major and minor axes. Measurements from the IRAS observatory gave a similar size estimate of 57 km. Photometric measurements made in 1993 give a rotation period of 10.38 hours.[2]
References
- ↑ "198 Ampella". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=198;cad=1.
- ↑ Marchis, F. et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus 185 (1): pp. 39–63, doi:10.1016/j.icarus.2006.06.001, PMID 19081813, Bibcode: 2006Icar..185...39M.
External links
- Lightcurve plot of 198 Ampella, Palmer Divide Observatory, B. D. Warner (2009)
- 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
- 198 Ampella at AstDyS-2, Asteroids—Dynamic Site
- 198 Ampella at the JPL Small-Body Database
 |  |
