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
^ 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 .^ 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 ^ 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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