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113 Amalthea

Main-belt asteroid

Field	Value
minorplanet	yes
background	#D6D6D6
name	113 Amalthea
image	Орбита астероида 113.png
caption	Orbital diagram
discoverer	R. Luther
discovery_site	Bilk Obs.
discovered	12 March 1871
mpc_name	(113) Amalthea
alt_names	A871 EA; ;
1951 CY
pronounced
named_after	Amalthea
mp_category	main-beltFlora
orbit_ref
epoch	31 July 2016 (JD 2457600.5)
observation_arc	144.90 yr (52926 d)
uncertainty	0
semimajor	2.37598 AU
perihelion	2.17010 AU
aphelion	2.5819 AU
eccentricity	0.086651
period	3.66 yr (1337.7 d)
inclination	5.0422°
asc_node	123.486°
arg_peri	79.118°
mean_anomaly	226.48°
mean_motion	/ day
mean_diameter
rotation	9.950 h
albedo
spectral_type	S
abs_magnitude	8.74

1951 CY

113 Amalthea () is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 50 km in diameter. It was discovered on 12 March 1871, by German astronomer Robert Luther at the Bilk Observatory in Düsseldorf, Germany. The elongated S-type asteroid has a rotation period of 9.95 hours. It was named after Amalthea from Greek mythology. A purported satellite of Amalthea was announced in July 2017, but was later found to be a software error in July 2021.

Description

Amalthea is thought to be a fragment from the mantle of a Vesta-sized, 300–600 km diameter parent body that broke up around one billion years ago, with the other major remnant being 9 Metis. The spectrum of Amalthea reveals the presence of the mineral olivine, a relative rarity in the asteroid belt.

Based on observations made during a stellar occultation by Amalthea of a 10th-magnitude star on 14 March 2017, it was announced in July 2017 that the asteroid has a small, 5-kilometer-sized satellite, provisionally designated S/2017 (113) 1. However, the satellite was later retracted as a software-reduction coding error on 17 July 2021. The occultation also indicated that Amalthea has a distinctly elongated shape.

One of Jupiter's inner small satellites, unrelated to 113 Amalthea, is also called Amalthea, as is an (apparently fictional) small Arjuna asteroid in Neal Stephenson's 2015 novel Seveneves.

References

Green, Daniel W. E.. (17 July 2021). "RETRACTION OF REPORT ON (113) AMALTHEA". Central Bureau for Astronomical Telegrams.
"Amateur Observers Find an Asteroid's Moon".

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.

flora-asteroids discoveries-by-robert-luther named-minor-planets objects-observed-by-stellar-occultation s-type-asteroids-(smass) s-type-asteroids-(tholen) astronomical-objects-discovered-in-1871

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