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1866 Sisyphus

Stony asteroid

Field	Value
minorplanet	yes
name	1866 Sisyphus
background	#FFC2E0
discovery_ref
discovered	5 December 1972
discoverer	P. Wild
discovery_site	Zimmerwald Obs.
mpc_name	(1866) Sisyphus
alt_names	1972 XA
pronounced
adjectives	Sysiphean , Sisyphian
named_after	Σίσυφος Sīsyphos (Greek mythology)
mp_category	{{Ubl
NEO<ref name	"jpldata" /
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	61.55 yr (22,482 days)
earliest_precovery_date	26 January 1955
aphelion	2.913 AU
perihelion	0.8747312 AU
semimajor	1.8936992 AU
eccentricity	0.5386
period	2.61 yr (952 days)
mean_anomaly	85.918°
mean_motion	/ day
inclination	41.202°
asc_node	63.498°
arg_peri	293.09°
satellites	1

moid	0.1045 AU
mars_moid	0.1291 AU
dimensions	{{Ubl
{{val	5.72	0.07	u	km}}
{{val	6.597	0.189	u	km}}
{{val	6.859	u	km}}
6.86 km <ref name	"lcdb" /
{{val	8		u	km}}
8.48 km<ref name	"Delbo-2003" /
{{val	8.9		u	km}}
rotation	{{Ubl
{{val	2.3909	0.0004	u	h}}
{{val	2.400		ul	h}}
{{val	2.4		u	h}}
{{val	2.401	0.001	u	h}}
{{val	2.424	0.001	u	h}}
{{val	2.7		u	h}}
albedo	{{Ubl
<ref name	"Delbo-2011" /
0.15<ref name	"Delbo-2003" /
<ref name	"Mainzer-2011" /
<ref name	"WISE" /
<ref name	"AKARI" /
<ref name	"Pravec-2012b" /
spectral_type	{{Hlist
SMASS {{	}} S
S<ref name	"Thomas-2014" /
magnitude	9.0 (discovery) 9.3 (2071 close approach)
abs_magnitude	{{Ubl
{{efn	name	LCDB-Pravec-1998}}
12.4<ref name	"jpldata" /
<ref name	"Pravec-2012b" /
13.0<ref name	"AKARI" /

| Apollo | NEO | Mars-crosser

| | | | 6.86 km (taken) | | 8.48 km | | | | | | | | | 0.15 | | | | | SMASS S | S | (R) | 12.4 | | 13.0

1866 Sisyphus is a binary stony asteroid, near-Earth object and the largest member of the Apollo group, approximately 7 kilometers in diameter.

It was discovered on 5 December 1972, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, and given the provisional designation ****. It was named after Sisyphus from Greek mythology.

Orbit and classification

This S-type asteroid (composed of rocky silicates) orbits the Sun in the inner main-belt at a distance of 0.9–2.9 AU once every 2 years and 7 months (952 days). Its orbit has an eccentricity of 0.54 and an inclination of 41° with respect to the ecliptic.

The Apollo asteroid has an Earth minimum orbit intersection distance of 0.1037 AU, which corresponds to 40.4 lunar distances. It will pass 0.11581 AU from Earth on 24 November 2071, and will peak at roughly apparent magnitude 9.3 on 26 November 2071. When it was discovered it peaked at magnitude 9.0 on 25 November 1972. It is one of the brightest near-Earth asteroids.

Physical characteristics

In the SMASS classification, Sisyphus is a common stony S-type asteroid.

Binary system

In 1985, this object was detected with radar from the Arecibo Observatory at a distance of 0.25 AU. The measured radar cross-section was 8 square kilometers. During the radar observations, a small minor-planet moon was detected around Sisyphus, although its existence was not reported until December 2007. Robert Stephens confirmed that it is a suspected binary, and Brian Warner added additional weight to this conclusion, giving hours as the satellite's orbital period, longer than the 25 hours previously reported by Stephens.

Diameter and albedo

With a measured mean diameter in the range of 5.7–8.9 kilometers, it is the largest of the Earth-crossing asteroids, comparable in size to the Chicxulub object whose impact contributed to the extinction of the dinosaurs. Larger near-Earth asteroids which are neither classified as Apollos nor Earth-crossers include 1036 Ganymed (32 km), 3552 Don Quixote (19 km), 433 Eros (17 km), and 4954 Eric (10.8 km).

Naming

This minor planet is named after Sisyphus from Greek mythology and refers to the cruel king of Ephyra, punished by being given the task of rolling a large stone up to a hill in the underworld, only to have it roll down again each time he neared the top. The official was published by the Minor Planet Center on 20 December 1974 (M.P.C. 3758).

Notes

References

Asteroid Lightcurve Database (LCDB) , query form (info )
Asteroids with Satellites , Robert Johnston, johnstonsarchive.net
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR Observatoire de Geneve, Raoul Behrend

References

{{OED. Sisyphean
{{OED. Sisyphian
[https://web.archive.org/web/20040608071121/http://echo.jpl.nasa.gov/~lance/binary.neas.html NASA.gov]
(September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". link. Icarus
(January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects". link. Icarus
(October 2011). "The Curse of Sisyphus". link. The Minor Planet Bulletin

Info: Wikipedia Source

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