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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]
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 | |
| (3752) Camillo | |
| Pronunciation | /kəˈmɪloʊ/ |
Named after | Camillo (son of King Turno and son of discoverer)[2] |
| 1985 PA | |
| 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 |
| 1.4135 AU | |
| Eccentricity | 0.3017 |
| 1.68 yr (614 d) | |
| 41.249° | |
| 0° 35m 11.4s / day | |
| Inclination | 55.555° |
| 147.98° | |
| 312.22° | |
| Earth MOID | 0.0780 AU (30.3871 LD) |
| Physical characteristics | |
| 2.3 km (approx.)[4] 2.306±0.088 km[5][6] 2.328 km[7] 2.33 km (taken)[8] | |
| 37.846 h[9] 37.881±0.005 h[10] | |
| 0.210±0.036[5][6] 0.22[4] 0.2234[7] | |
| S (assumed)[8] | |
| 15.3[3] · 15.41[8][9] · 15.41±0.13[7] · 15.5[5] | |
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]
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]
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 |
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 |
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]
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