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1218 Aster

Main-belt asteroid

Field	Value
minorplanet	yes
name	1218 Aster
background	#D6D6D6
image	001218-asteroid shape model (1218) Aster.png
caption	Shape model of Aster from its lightcurve
discovery_ref
discovered	29 January 1932
discoverer	K. Reinmuth
discovery_site	Heidelberg Obs.
mpc_name	(1218) Aster
alt_names	1932 BJ

pronounced
named_after	Aster (genus of flowers)
mp_category	main-belt(inner)
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	85.35 yr (31,173 days)
aphelion	2.5110 AU
perihelion	2.0158 AU
semimajor	2.2634 AU
eccentricity	0.1094
period	3.41 yr (1,244 days)
mean_anomaly	56.714°
mean_motion	/ day
inclination	3.1572°
asc_node	63.820°
arg_peri	69.372°
dimensions	km
albedo
abs_magnitude	13.2

1218 Aster, provisional designation , is a bright asteroid from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. Discovered by Karl Reinmuth in 1932, it was later named after the flowering plant Aster.

Discovery

Aster was discovered on 29 January 1932, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany. Two nights later, it was independently discovered by Italian astronomer Mario A. Ferrero at the Pino Torinese Observatory at Turin, Italy.

Classification and orbit

Aster orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 5 months (1,244 days). Its orbit has an eccentricity of 0.11 and an inclination of 3° with respect to the ecliptic.

The asteroid's observation arc begins at the discovering observatory, one week 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, Aster measures 5.554 kilometers in diameter and its surface has an albedo of 0.332.

Lightcurves

As of 2017, rotational lightcurve of Aster has been obtained. The body's rotation period, shape and variation in magnitude shifted from unknown movements to specific identifiable spin/shape determinations.

Naming

The minor planet was named after the genus of flowers, Aster (also see ). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 113).

References

{{MW. aster
"Asteroid Lightcurve Research 1218 Aster Phased Plot". Astronomical Society of Las Cruces (ASLC).

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.

background-asteroids discoveries-by-karl-wilhelm-reinmuth named-minor-planets astronomical-objects-discovered-in-1932

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