198 Ampella

198 Ampella
	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° 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
Mass	(2.62 ± 1.24/0.49)×1018 kg
Mean density	3.121 ± 1.477/0.588 g/cm3
Synodic rotation period	10.379 h (0.4325 d)
Geometric albedo	0.268±0.035
Spectral type	S
Absolute magnitude (H)	8.58

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]

References[edit]

^ ^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). 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, vol. 185, no. 1, pp. 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813.

External links[edit]

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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
198 Ampella at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

This article about an S-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[jpldata-1] "198 Ampella". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 30 August 2020. Retrieved 6 May 2016.

[FiengaEtAl2020-2] Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.

[Marchis2006-3] Marchis, F.; et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus, vol. 185, no. 1, pp. 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813.

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