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(5646) 1990 TR

Probable rare-type binary asteroid

Field	Value
minorplanet	yes
name	(5646) 1990 TR
background	#FFC2E0
discovery_ref
discovered	11 October 1990
discoverer	S. Ueda
H. Kaneda
discovery_site	Kushiro Obs.
mpc_name	(5646) 1990 TR
alt_names	1990 TR
mp_category	AmorNEO
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	26.90 yr (9,825 days)
aphelion	3.0791 AU
perihelion	1.2087 AU
semimajor	2.1439 AU
eccentricity	0.4362
period	3.14 yr (1,147 days)
mean_anomaly	218.56°
mean_motion	/ day
inclination	7.9118°
asc_node	14.141°
arg_peri	335.68°
moid	0.2112 AU 82.3 LD
satellites	1
dimensions	km
2.30 km (derived)
km
km
4.3 km (dated)
rotation	h
h
h
albedo	0.18 (assumed)

spectral_type	SMASS = U
QSU
abs_magnitude	14.315.0015.415.4515.67

H. Kaneda 2.30 km (derived) km km 4.3 km (dated) h h

QSU

**** is a probable rare-type binary asteroid classified as near-Earth object of the Amor group, approximately 2.3 kilometers in diameter. It was discovered on 11 October 1990, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at Kushiro Observatory near Kushiro, in eastern Hokkaido, Japan.

Orbit

The asteroid orbits the Sun at a distance of 1.2–3.1 AU once every 3 years and 2 months (1,147 days). Its orbit has an eccentricity of 0.44 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins with its first observation at the Siding Spring Observatory, five months prior to its official discovery observation at Kushiro.

Lightcurve

In December 2012, the so far best rated rotational lightcurve was obtained by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave a rotation period of 3.1999 hours with a brightness variation of 0.12 magnitude (). Photometric observations also gave a period of 19.47 hours for a probable asteroid moon, with a measured diameter-ratio of , which translates into a diameter of 400 meters for its moon.

Diameter and albedo

According to the surveys carried out by the Spitzer Space Telescope and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 2.03 and 2.723 kilometers in diameter and its surface has an albedo of 0.19 and 0.66. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and derives a diameter of 2.3 kilometers based on an absolute magnitude of 15.67.

References

|archive-url = https://web.archive.org/web/20040608071121/http://echo.jpl.nasa.gov/~lance/binary.neas.html |url-status = dead |archive-date = 2004-06-08

|display-authors = 6

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.

amor-asteroids discoveries-by-hiroshi-kaneda discoveries-by-seiji-ueda binary-asteroids unclassifiable-asteroids-(smass) astronomical-objects-discovered-in-1990

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