Global Information198 Ampella information
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | A. Borrelly |
| Discovery date | 13 June 1879 |
| Designations | |
MPC designation | (198) Ampella |
| Pronunciation | /æmˈpɛlə/ |
Named after | Ampelos |
Alternative designations | 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) |
| Aphelion | 3.0193 AU (451.68 Gm) |
| Perihelion | 1.8986 AU (284.03 Gm) |
Semi-major axis | 2.4589 AU (367.85 Gm) |
| Eccentricity | 0.22788 |
Orbital period (sidereal) | 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° |
Argument of perihelion | 88.586° |
| Earth MOID | 0.921007 AU (137.7807 Gm) |
| Jupiter MOID | 2.52287 AU (377.416 Gm) |
| TJupiter | 3.437 |
| Physical characteristics | |
Mean diameter | 54.323±0.343 km[1] |
| Mass | (2.62 ± 1.24/0.49)×1018 kg[2] |
Mean density | 3.121 ± 1.477/0.588 g/cm3[2] |
Synodic rotation period | 10.379 h (0.4325 d) |
Geometric albedo | 0.268±0.035[1] |
Spectral type | S |
Absolute magnitude (H) | 8.58[1] |
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.[3]
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