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11573 Helmholtz

Main-belt asteroid

Field	Value
minorplanet	yes
name	11573 Helmholtz
background	#D6D6D6
discovery_ref
discoverer	F. Börngen
L. D. Schmadel
discovery_site	Karl Schwarzschild Obs.
discovered	20 September 1993
mpc_name	(11573) Helmholtz
alt_names
named_after	Hermann von Helmholtz
(German naturalist)
mp_category	main-belt(outer)
backgroundZhongguo
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	34.92 yr (12,755 d)
aphelion	4.1213 AU
perihelion	2.3952 AU
semimajor	3.2582 AU
eccentricity	0.2649
period	5.88 yr (2,148 d)
mean_anomaly	21.116°
mean_motion	/ day
inclination	2.2499°
asc_node	310.61°
arg_peri	127.67°
mean_diameter	13 km (est. at 0.057)
abs_magnitude	13.2

L. D. Schmadel (German naturalist) backgroundZhongguo

11573 Helmholtz, provisional designation , is a Zhongguo asteroid from the outermost region of the asteroid belt, approximately 13 km in diameter. It was discovered on 20 September 1993, by German astronomers Freimut Börngen and Lutz Schmadel at the Karl Schwarzschild Observatory in Tautenburg, Germany. It is one of few asteroids located in the 2:1 resonance with Jupiter. The asteroid was named for German physicist Hermann von Helmholtz.

Orbit and classification

Helmholtz is a non-family asteroid from the main belt's background population. It is a member of the small group of Zhongguo asteroids, located in the Hecuba gap (2:1 mean motion resonance with Jupiter) near 3.27 AU. Contrary to the nearby unstable Griqua group, the orbits of the Zhongguos are stable over half a billion years.

It orbits the Sun in the outer main-belt at a distance of 2.4–4.1 AU once every 5 years and 11 months (2,148 days; semi-major axis of 3.26 AU). Its orbit has an eccentricity of 0.26 and an inclination of 2° with respect to the ecliptic. The asteroid was first observed as at Crimea–Nauchnij in December 1982. The body's observation arc begins at Palomar Observatory in January 1989.

Physical characteristics

Diameter and albedo

Based on a generic magnitude-to-diameter conversion, Helmholtz measures 13 kilometer in diameter for an absolute magnitude of 13.2 and an assumed albedo of 0.057, which is typical for carbonaceous asteroids. If the body was of stony rather than carbonaceous composition, its estimated diameter would be less than 7 kilometer.

Rotation period

As of 2018, no rotational lightcurve of Helmholtz has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.

Naming

This minor planet was named after German physiologist and physicist Hermann von Helmholtz (1821–1894), a prolific naturalists of the 19th century. The official naming citation was published by the Minor Planet Center on 20 March 2000 (M.P.C. 39658). The lunar crater Helmholtz as well as the crater Helmholtz on Mars are also named in his honor.

References

{{GPN. 2438
{{GPN. 2439

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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