3752 Camillo
{{Short description|Inclined contact-binary asteroid}}
{{Use dmy dates|date=May 2018}}
{{Infobox planet
| minorplanet = yes
| name = 3752 Camillo
| image = 3752 Camillo Radar.jpg
| image_scale =
| caption = Radar image of Camillo taken by the Arecibo Observatory on 21 February 2018, revealing its angular bilobate shape
| background = #FFC2E0
| discovered = 15 August 1985
| discoverer = E. F. Helin
M. Barucci
| discovery_site = CERGA Obs.
| mpc_name = (3752) Camillo
| alt_names = 1985 PA
| pronounced = {{IPAc-en|k|ə|'|m|ɪ|l|oʊ}}
| named_after = Camillo {{small|(son of King Turno and son of discoverer)}}
| mp_category = NEO{{·}}Apollo
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 42.26 yr (15,436 d)
| aphelion = 1.8400 AU
| perihelion = 0.9871 AU
| semimajor = 1.4135 AU
| eccentricity = 0.3017
| period = 1.68 yr (614 d)
| mean_anomaly = 41.249°
| mean_motion = {{Deg2DMS|0.5865|sup=ms}} / day
| inclination = 55.555°
| asc_node = 147.98°
| arg_peri = 312.22°
| moid = 0.0780 AU (30.3871 LD)
| mean_diameter = {{val|2.3|ul=km}} {{small|(approx.)}}
{{val|2.306|0.088|u=km}}
{{val|2.328|u=km}}
{{val|2.33|u=km}} {{small|(taken)}}
| rotation = {{val|37.846|ul=h}}
{{val|37.881|0.005|u=h}}
| albedo = {{val|0.210|0.036}}
0.22
{{val|0.2234}}
| spectral_type = S {{small|(assumed)}}
| abs_magnitude = 15.3{{·}}15.41{{·}}{{val|15.41|0.13}}{{·}}15.5
}}
3752 Camillo is an inclined contact-binary asteroid, classified as near-Earth object of the Apollo group, approximately {{convert|2.3|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 15 August 1985, by astronomers Eleanor Helin and Maria Barucci using a {{convert|0.9|m|in|adj=on}} 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.
Orbit
File:3752_Camillo_orbit-2018.png
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.
= Close approaches =
The closest point between the orbit of the Earth and the orbit of this asteroid (Earth MOID) is currently {{convert|0.0780|AU|km mi|abbr=on|lk=on}} or 30 lunar distances, 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 {{convert|0.08013|AU|km mi|abbr=on|lk=on}} of Earth.
== 2013 passage ==
Camillo came to perihelion on 27 December 2012. On 12 February 2013 the asteroid passed {{convert|0.14775|AU|km mi|abbr=on|lk=on}} from Earth and had an apparent magnitude of 13. During the 2013 passage the asteroid was studied by radar using Goldstone and Arecibo.
| 480px 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.{{cite web|url=https://twitter.com/AreciboRadar/status/966158518272385030|title=Radar images of 3752 Camillo|publisher=Arecibo Observatory (on Twitter) |date=21 February 2018}} At {{convert|0.13|AU|km mi|abbr=on|lk=on}} distance its peak magnitude was about 13.
| 480px Camillo's south to north daily motion in the sky as seen from the earth |
{{multiple image
|direction = horizontal
|align= left
|width1= 250
|width2= 225
|image1=Camillo 2018-02-22 NBO.gif
|image2=Camillo 2018-02-22 NBO stack.png
|footer= 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. 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.
}}
{{clear}}
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. The official naming citation was published by the Minor Planet Center on 20 May 1989 ({{small|M.P.C. 14633}}).
References
{{reflist|refs=
|type = 2018-05-03 last obs.
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|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2003752;cad=1
|publisher = Jet Propulsion Laboratory
|access-date = 10 May 2018}}
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|isbn = 978-3-540-00238-3
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|title = 3752 Camillo (1985 PA)
|work = Minor Planet Center
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|title = MPC/MPO/MPS Archive
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|date = February 2016
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|last1 = Wells
|first1 = G.
|last2 = Bamberger
|first2 = D.
|title = 3752 Camillo
|publisher = Northolt Branch Observatories
|date = 22 February 2018
|url = https://www.facebook.com/NBObservatories/videos/1866655950035934/
|access-date= 10 May 2018}}
|last1 = Wells
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|access-date= 10 May 2018}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- {{NeoDys|3752}}
- {{ESA-SSA|3752|Camillo}}
- {{JPL small body}}
{{Minor planets navigator |3751 Kiang |number=3752 |3753 Cruithne}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Camillo}}
Category:Discoveries by Eleanor F. Helin