Difference between revisions 9502196 and 9540112 on viwiki

{{Thông tin hành tinh
| width           = 25em
| background      = #FFFFC0
| name = 5335 Damocles
| discoverer = [[Robert H. McNaught]]
| discovered = 18 tháng 2, 1991
| alt_names= 1991 DA 
| named_after = [[Damocles]] 
| mp_category= [[Damocloid asteroid|Damocloid]]
| epoch = 1 tháng 1, 2006 ([[Ngày Julius|JD]] 2453736.5 )
| semimajor = 11.84 [[Astronomical Unit|AU]]
| periapsis = 1.58 AU
| apoapsis = 22.10 AU
| eccentricity = 0.87
| period = 14880.90 [[ngày|d]], 40.74 [[Năm Julius (thiên văn)|a]]
| inclination = 61.95 [[Degree (angle)|°]]
| asc_node = .02°
| arg_peri = 191.25°
| mean_anomaly = 133.07°
| avg_speed=6.67 km/s
| dimensions =~ 10 km
| mass =
| density =
| surface_grav=
| escape_velocity =
| rotation =10.2 [[hour|h]]
| spectral_type = S
| abs_magnitude =13.3
| albedo =  
| single_temperature=}}
'''5335 Damocles''' ({{IPAc-en|icon|ˈ|d|æ|m|ə|k|l|iː|z}} {{Respell|DAM|ə-kleez}}) is the [[archetype]] of the [[Damocloid asteroid|Damocloids]], asteroids that are inactive nuclei of the [[Halley Family]] and [[long-period comet]]s. It được khám phá in 1991 and named after [[Damocles]], a figure of [[Greek mythology]]. 

When Damocles was discovered, in 1991 bởi [[Robert H. McNaught]], it was found to be ngày an [[orbit]] completely different from all others known. Damocles' orbit reached from inside the [[apoapsis]] of [[Mars]] to xa về as [[Uranus]]. It seemed to be in transition from a near-circular [[Solar System#Outer Solar System|outer Solar System]] orbit to an eccentric orbit taking it to the [[Solar System#Inner Solar System|inner Solar System]].<ref>Steel, D. "[[Rogue Asteroid]]s and [[Doomsday Comet]]s", page 127-8. Wiley & Sons, 1995</ref> [[Duncan Steel]], [[Gerhard Hahn]], [[Mark Bailey]], and [[David Asher]] carried out projections of its long-term dynamical evolution, and found a good probability that it will become an [[List of Earth-crossing minor planets|Earth-crosser asteroid]], and may spend a quarter of its life in such an orbit. Damocles has a stable orbit for tens of thousands of năm before and after the present, because its highly inclined orbit does not take it near [[Jupiter]] or [[Saturn]].

There is some speculation that 5335 Damocles may have a [[meteor shower]] associated with it ngày Mars from the direction of [[Draco (constellation)|Draco]].<ref>[http://star.arm.ac.uk/~aac/showers.jpg Meteor Showers and Their Parent Bodies]</ref>

The adjectival form is Damoclean, {{IPA|/dæməˈkliːən/}}.<ref>OED</ref>

== Xem thêm ==
*[[List of asteroids]]

== Tham khảo ==
{{ReflistTham khảo}}

== Liên kết ngoài ==
* [http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:Damocles;main AstDys]
* {{JPL Small Body}}
* [http://ssd.jpl.nasa.gov/horizons.html for JPL Horizons telnet version is most comprehensive]

{{MinorPlanets Navigator|5334 Mishima|(5336) 1991 JE1}}
{{MinorPlanets_Footer}}

{{DEFAULTSORT:Damocles}}
[[Thể loại:Damocloid asteroids]]
[[Thể loại:Tiểu hành tinh kiểu S]]
[[Thể loại:Tiểu hành tinh được đặt tên theo thần thoại Hy Lạp]]
[[Thể loại:Được phát hiện bởi Robert H. McNaught]]
[[Thể loại:Thiên thể phát hiện năm 1991]]


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