5653 Camarillo

5653 Camarillo (/ˌkæməˈriːoʊ/ KAM-ə-REE-oh), provisional designation 1992 WD₅, is a stony asteroid and near-Earth object of the Amor group, approximately 1.5 kilometers in diameter.

5653 Camarillo

Discovery[1]
Discovered by	E. F. Helin K. Lawrence
Discovery site	Palomar Obs.
Discovery date	21 November 1992
Designations
MPC designation	(5653) Camarillo
Pronunciation	/ˌkæməˈriːoʊ/ KAM-ə-REE-oh
Named after	Camarillo (city in California)
Alternative designations	1992 WD5
Minor planet category	NEO · Amor[1][2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	43.23 yr (15,789 days)
Aphelion	2.3402 AU
Perihelion	1.2484 AU
Semi-major axis	1.7943 AU
Eccentricity	0.3043
Orbital period (sidereal)	2.40 yr (878 days)
Mean anomaly	77.730°
Mean motion	0° 24m 36.36s / day
Inclination	6.8739°
Longitude of ascending node	9.9739°
Argument of perihelion	122.51°
Earth MOID	0.2846 AU · 110.9 LD
Physical characteristics
Dimensions	1.526 km[3] 1.53 km (taken)[4] 1.537±0.016 km[5][6] 1.573±0.287 km[7]
Synodic rotation period	4.834±0.005 h[8] 4.8346±0.0002 h[9] 4.8350±0.0018 h[10]
Geometric albedo	0.2052[3] 0.220±0.097[7] 0.271±0.057[5][6]
Spectral type	S[4][a] · S/Sr[11]
Absolute magnitude (H)	15.83±0.2 (R)[b] · 15.980±0.007 (R)[10] · 16.1[1][5] · 16.28±0.3[7] · 16.31±0.33[12] · 16.42[4] · 16.42±0.13[3]

It was discovered on 21 November 1992, by American astronomers Eleanor Helin and Kenneth Lawrence at Palomar Observatory in California, United States.^[2] The asteroid was named for the Californian town of Camarillo.^[13]

Orbit and classification

Camarillo orbits the Sun at a distance of 1.2–2.3 AU once every 2 years and 5 months (878 days). Its orbit has an eccentricity of 0.30 and an inclination of 7° with respect to the ecliptic.^[1]

It has an Earth minimum orbit intersection distance, MOID, of 0.2846 AU (42,600,000 km), which corresponds to 110.9 lunar distances.^[1]

A first precovery was taken at the Australian Siding Spring Observatory in 1974, extending the body's observation arc by 18 years prior to its official discovery observation at Palomar.^[2]

Physical characteristics

The S-type asteroid has also been characterized as a Sr-subtype, a transitional group to the R-type asteroids.^[11]

Lightcurves

Between 1995 and 2015, several rotational lightcurves of Camarillo gave a well-defined rotation period of 4.834 hours with a brightness amplitude between 0.4 and 0.85 magnitude.^{[8][9][10][14][b]}

Diameter and albedo

According to the surveys carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Camarillo has an albedo between 0.21 and 0.25 with a corresponding diameter of 1.53 to 1.57 kilometers.^[3][5][6][7]

Naming

This minor planet was named after for the Californian town of Camarillo and its Camarillo Observatory (670). The town was named after Adolfo Camarillo (1864–1958), a well known regional rancher. The first discoverer is a former town resident.^[13] The official naming citation was published by the Minor Planet Center on 4 August 2001 (M.P.C. 43189).^[15]

References

1. Dandy (2003) Optical colors of 56 near-Earth objects: trends with size and orbit. Summary figures for (5653) Camarillo at Collaborative Asteroid Lightcurve Link (CALL)
2. Pravec (1999) web: rotation period 4.834 hours with a brightness amplitude of 0.4 mag. Summary figures for (5653) Camarillo at Collaborative Asteroid Lightcurve Link (CALL)