3752 Camillo is an inclined contact-binary asteroid, classified as near-Earth object of the Apollo group, approximately 2.3 kilometers (1.4 miles) in diameter. It was discovered on 15 August 1985, by astronomers Eleanor Helin and Maria Barucci using a 0.9-metre (35 in) telescope at the CERGA Observatory in Caussols, France. Lightcurve studies by Petr Pravec in 1998 suggest that the assumed S-type asteroid has an elongated shape and a longer-than average rotation period of 38 hours.[1][4]

3752 Camillo

Radar image of Camillo taken by the Arecibo Observatory on 21 February 2018, revealing its angular bilobate shape
Discovery [1]
Discovered by	E. F. Helin M. Barucci
Discovery site	CERGA Obs.
Discovery date	15 August 1985
Designations
MPC designation	(3752) Camillo
Pronunciation	/kəˈmɪloʊ/
Named after	Camillo (son of King Turno and son of discoverer)[2]
Alternative designations	1985 PA
Minor planet category	NEO · Apollo [1][3]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	42.26 yr (15,436 d)
Aphelion	1.8400 AU
Perihelion	0.9871 AU
Semi-major axis	1.4135 AU
Eccentricity	0.3017
Orbital period (sidereal)	1.68 yr (614 d)
Mean anomaly	41.249°
Mean motion	0° 35m 11.4s / day
Inclination	55.555°
Longitude of ascending node	147.98°
Argument of perihelion	312.22°
Earth MOID	0.0780 AU (30.3871 LD)
Physical characteristics
Mean diameter	2.3 km (approx.)[4] 2.306±0.088 km[5][6] 2.328 km[7] 2.33 km (taken)[8]
Synodic rotation period	37.846 h[9] 37.881±0.005 h[10]
Geometric albedo	0.210±0.036[5][6] 0.22[4] 0.2234[7]
Spectral type	S (assumed)[8]
Absolute magnitude (H)	15.3[3] · 15.41[8][9] · 15.41±0.13[7] · 15.5[5]

Orbit

Camillo orbits the Sun at a distance of 0.99–1.8 AU once every 20 months (614 days; semi-major axis of 1.41 AU). Its orbit has an eccentricity of 0.30 and an inclination of 56° with respect to the ecliptic.[3]

Close approaches

The closest point between the orbit of the Earth and the orbit of this asteroid (Earth MOID) is currently 0.0780 AU (11,670,000 km; 7,250,000 mi) or 30 lunar distances,[3] so Camillo does not come close enough to Earth to qualify as a potentially hazardous asteroid. It came to perihelion (its closest approach to the Sun) on 6 January 1976 and, on 17 February 1976 and passed within 0.08013 AU (11,987,000 km; 7,449,000 mi) of Earth.[3]

2013 passage

Camillo came to perihelion on 27 December 2012.[3] On 12 February 2013 the asteroid passed 0.14775 AU (22,103,000 km; 13,734,000 mi) from Earth[3] and had an apparent magnitude of 13.[4] During the 2013 passage the asteroid was studied by radar using Goldstone and Arecibo.[4]

Camillo's south to north daily motion in the sky as seen from the earth

2018 passage

On February 20, 2018, the asteroid passed by Earth. It was observed on radar by Arecibo Observatory and shown to have a long angular double-lobed shape.[11] At 0.13 AU (19,000,000 km; 12,000,000 mi) distance its peak magnitude was about 13.

Camillo's south to north daily motion in the sky as seen from the earth

Left: A 25 minute timelapse sequence of 3752 Camillo taken from Northolt Branch Observatories (London, UK) on 22 February 2018, two days after closest approach. The asteroid can be seen at apparent magnitude +14, moving upwards through the image. Brightness is inverted (stars appear dark, the sky background appears light). Camillo was about 21.9 million km (13.6 million mi) from Earth at that time.[12] Right: Camillo as seen from Northolt Branch Observatories on 22 February 2018. The image is corrected for the asteroid's motion, so stars appear trailed.[13]

Naming

This minor planet was named for the son of the early Roman King Turno. "Camillo" is also the name of the discoverer's son.[2] The official naming citation was published by the Minor Planet Center on 20 May 1989 (M.P.C. 14633).[14]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• 3752 Camillo at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• 3752 Camillo at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• 3752 Camillo at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

[de] (3752) Camillo

[fr] (3752) Camillo

[ru] (3752) Камилло