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1161 Thessalia

Main-belt asteroid

Summary

Main-belt asteroid

Field	Value
minorplanet	yes
name	1161 Thessalia
background	#D6D6D6
discovery_ref
discoverer	K. Reinmuth
discovery_site	Heidelberg Obs.
discovered	29 September 1929
mpc_name	(1161) Thessalia
alt_names	1929 SF1931 BB
pronounced
named_after	Thessaly (Greek region)
mp_category	main-belt(outer)
background
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	87.76 yr (32,056 days)
aphelion	3.4488 AU
perihelion	2.8975 AU
semimajor	3.1732 AU
eccentricity	0.0869
period	5.65 yr (2,065 days)
mean_anomaly	213.02°
mean_motion	/ day
inclination	9.3913°
asc_node	72.567°
arg_peri	309.20°
dimensions	km
albedo
abs_magnitude	11.2

background

1161 Thessalia, provisional designation , is a dark background asteroid from the outer regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 29 September 1929, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. It was named for the Greek region Thessaly.

Orbit and classification

Thessalia is a non-family asteroid from the main belt's background population. It orbits the Sun in the outer main-belt at a distance of 2.9–3.4 AU once every 5 years and 8 months (2,065 days). Its orbit has an eccentricity of 0.09 and an inclination of 9° with respect to the ecliptic. The body's observation arc begins at Heidelberg, five weeks after its official discovery observation.

Physical characteristics

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Thessalia measures 21.498 kilometers in diameter and its surface has an albedo of 0.065.

Lightcurves

As of 2017, no rotational lightcurve of Thessalia has been obtained from photometric observations. The asteroid's rotation period, poles and shape remain unknown.

Naming

This minor planet was named for the Thessaly region in eastern Greece. The subsequently numbered minor planet 1162 Larissa was named after the region's capital. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 108).

References

{{OED. Thessalian

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.

background-asteroids discoveries-by-karl-wilhelm-reinmuth named-minor-planets astronomical-objects-discovered-in-1929

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