198 Ampella

Main-belt asteroid October 2019 yes (198) Ampella #D6D6D6 198 Ampella Орбита астероида 198.png Orbital diagram Ampelos A. Borrelly 13 June 1879 A879 LA; 1957 YA 1 æ m ' p ɛ l ə Main belt 131.26 yr (47944 d) 0 2026-Jun-09 (JD 2461200.5) 2.459 AU 1.901 AU 2026-Sep-30Horizons2026 3.018 AU 3.86 yr (1409 d) 9.323° 0.2271 268.2° 89.02° 331° 0.25561 ms / day 0.923 AU e6km e6mi unit 2.52 AU 3.437 54.323 0.343 km (2.62 ± 1.24/0.49)18 kg 3.121 ± 1.477/0.588 g/cm3 10.379 h d on on S 8.58 0.268 0.035 198 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 F. Marchis M. Kaasalainen E. F. Y. Hom J. Berthier J. Enriquez D. Hestroffer D. Le Mignant I. de Pater 1 Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey Icarus 185 1 39–63 November 2006 2006Icar..185...39M 10.1016/j.icarus.2006.06.001 . 19081813 2600456 https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=198 https://web.archive.org/web/20200830140203/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=198;cad=1 live 30 August 2020 198 Ampella JPL Small-Body Database NASA/Jet Propulsion Laboratory 6 May 2016 Fienga A. Avdellidou C. Hanuš J. February 2020 Asteroid masses obtained with INPOP planetary ephemerides https://academic.oup.com/mnras/article/492/1/589/5658701 Monthly Notices of the Royal Astronomical Society 492 1 589–602 10.1093/mnras/stz3407 free subscription Horizons Batch for 198 Ampella on 2026-Nov-27 JPL Horizons Perihelion occurs when rdot flips from negative to positive https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27198%27&START_TIME=%272026-Sep-30%27&STOP_TIME=%272026-Oct-01%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719,20%27 2026-10-05 (JPL#109 Soln.date: 2026-Jun-05) External links Lightcurve plot of 198 Ampella, Palmer Divide Observatory, B. D. Warner (2009) Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 198 197 Arete 198 199 Byblis Category:Background asteroids Ampella Ampella Category:S-type asteroids (Tholen) Category:S-type asteroids (SMASS) 18790613