 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 | |
| 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° 15 20.196 / 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 |
| Mass | (2.62 ± 1.24/0.49)×10 kg |
| Mean density | 3.121 ± 1.477/0.588 g/cm |
| Synodic rotation period | 10.379 h (0.4325 d) |
| Geometric albedo | 0.268±0.035 |
| Spectral type | S |
| Absolute magnitude (H) | 8.58 |
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.
References
- ^ "198 Ampella". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 30 August 2020. Retrieved 6 May 2016.
- ^ Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1): 589–602. doi:10.1093/mnras/stz3407.
- Marchis, F.; et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus, 185 (1): 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813.
External links
- Lightcurve plot of 198 Ampella, Palmer Divide Observatory, B. D. Warner (2009)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- 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
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