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198 Ampella

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198 Ampella
Orbital diagram
Discovery
Discovered byA. Borrelly
Discovery date13 June 1879
Designations
(198) Ampella
Pronunciation/æmˈpɛlə/
Named after
Ampelos
A879 LA; 1957 YA1
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc131.26 yr (47944 d)
Aphelion3.0193 AU (451.68 Gm)
Perihelion1.8986 AU (284.03 Gm)
2.4589 AU (367.85 Gm)
Eccentricity0.22788
3.86 yr (1408.4 d)
131.10°
0° 15m 20.196s / day
Inclination9.3113°
268.45°
88.586°
Earth MOID0.921007 AU (137.7807 Gm)
Jupiter MOID2.52287 AU (377.416 Gm)
TJupiter3.437
Physical characteristics
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]
10.379 h (0.4325 d)
0.268±0.035[1]
S
8.58[1]

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]

References

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  1. ^ a b c d "198 Ampella". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 30 August 2020. Retrieved 6 May 2016.
  2. ^ a b 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.
  3. ^ 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.
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