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2011 MD: Difference between revisions





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{{Use dmy dates|date=February 2018}}
{{Infobox planet
| minorplanet = yes
| backgroundname = #FFC2E02011 MD
| background = #FFC2E0
| name = 2011 MD▼
| image = PIA18453-Asteroid2011MD-SpitzerSpaceTelescope-IRAC-Feb2014.jpg
| image_scale =
| image_size = 250
| caption = 2011MD{{mp|2011 inMD}} Februaryimaged 2014<br>(by ''[[Spitzer Space Telescope|Spitzer]]'' Spacein Telescope,February IRAC]]).2014
| discovery_ref = <ref name="jpldata" /><ref name="MPEC2011-M23"/>
| discoverer = [[Lincoln Near-Earth Asteroid Research|LINEAR]] ([[List of observatory codes#700-799|704]])
| discovery_site = [[Lincoln Laboratory's Experimental Test Site|Lincoln Lab's ETS]]
| discovered = 2011 June 22
| discovered = 2011 June 22<br />{{small|(first observed only)}}
| alt_names =▼
▲ | namempc_name = 2011 MD
| mp_category = [[Amor asteroid|Amor]] [[Near-Earth object|NEO]]<ref name="jpldata"/>
▲ | alt_names =
| epoch = 11 July 2011 ([[Julian day|JD]] 2455753.5)▼
| observation_arcpronounced = 967 days (2.65 yr) =
| named_after =
| semimajor = {{Convert|1.0602|AU|Gm|abbr=on}}
| mp_category = {{nowrap|[[Near-Earth object|NEO]]{{·}}[[Apollo asteroid|Apollo]]<ref name="jpldata"/>{{·}}[[Amor asteroid|Amor]]<ref name="MPC-object" />}}
| perihelion = {{Convert|1.0161|AU|Gm|abbr=on}}
| orbit_ref = <ref name="jpldata" />▼
| aphelion = {{Convert|1.1044|AU|Gm|abbr=on|lk=on}}
▲ | epoch = 1113 July 2011 ([[Julian day|JD]] 24557532455755.5)
| eccentricity = 0.041638▼
| uncertainty = 2<ref name="jpldata" />{{·}}0<ref name="MPC-object" />
| period = 1.09 [[Julian year (astronomy)|yr]] (398.74 [[Julian year (astronomy)|d]])▼
| inclinationobservation_arc = 2.5837°65 yr (967 days)
| aphelion = 1.1031 [[Astronomical unit|AU]]
| asc_node = 274.09°▼
| arg_periperihelion = 41.6800°0161 AU
| semimajor = 1.0596 AU
| mean_anomaly = 9.1059[[Degree (angle)|°]]▼
▲ | eccentricity = 0.0416380411
| dimensions = ~{{convert|6|m|0|sp=us}}<ref name="NASA2014-195"/><ref name="Mommert2014"/>▼
▲ | period = 1.09 [[Julian year (astronomy)|yr]] (398.74 [[Julian year (astronomy)|d]]days)
| albedo = 0.3<ref name="Mommert2014"/>▼
▲ | mean_anomaly = 911.1059051[[Degree (angle)|°]]
| density = ~1 g/cm³ ([[rubble pile]])<ref name="NASA2014-195"/>▼
| rotationmean_motion = {{ConvertDeg2DMS|0.19379037|h|d|abbrsup=on|lk=onms}}<ref name="jpldata"/> day
| inclination = 2.5624°
| abs_magnitude = 28.0<ref name="jpldata"/>▼
▲ | asc_node = 274273.0996°
| mean_motion = {{Deg2DMS|0.90284|sup=ms}} /day
| arg_peri = 4.6748°
▲ | orbit_ref = <ref name="jpldata"/>
| moid = 0.0003 AU (0.1 [[Lunar distance (astronomy)|LD]])
| uncertainty = 1
▲ | dimensionsmean_diameter = ~{{convertval|6|ul=m}} {{small|0|sp=us(estimate)}}<ref name="NASA2014-195"/><ref name="Mommert2014"/>
| moid = {{Convert|0.000351106|AU|km|abbr=on}}
▲ | density = ~{{val|1 |ul=g/cm³cm3}} {{small|(est. [[rubble pile]])}}<ref name="NASA2014-195"/>
| jupiter_moid = {{Convert|3.88352|AU|Gm|abbr=on}}
▲ | albedo = 0.3<ref name="Mommert2014"/>
| rotation = {{val|0.1937|ul=h}}<ref name="jpldata"/>
▲ | abs_magnitude = 28.0<ref name="jpldata"/>
}}
 
'''2011 MD''' is a bright micro-[[asteroid]], classified as [[near-Earth object]] of the [[Apollo asteroid|Apollo]] and [[Amor asteroid|Amor group]], respectively.<ref name="jpldata"/><ref name="MPC-object" /> On 27 June 2011, at around 17:00 UTC (13:00 EDT), the object passed exceptionally close to Earth's surface at a distance of approximately {{convert|12000|km|mi|-2|sp=us}}, roughly the diameter of the Earth.<ref name="NASA-news" /><ref name="SKY1"/><ref name="NatGeo" />
'''2011 MD''' is an [[Apollo asteroid]] that passed relatively close to Earth's surface — at a distance of about {{convert|12000|km|mi|-2|sp=us}}, roughly the diameter of the Earth — at around 17:00 UTC (13:00 EDT) on June 27, 2011.<ref name="jpldata"/><ref>{{cite web|author=Don Yeomans |author2=Paul Chodas |last-author-amp=yes |url=http://neo.jpl.nasa.gov/news/news172.html |title=Bend it Like Beckham! Small Asteroid to Whip Past Earth on June 27, 2011 |publisher=[[NASA]]/JPL Near-Earth Object Program Office |date=June 23, 2011 |accessdate=June 26, 2011 |archiveurl=https://web.archive.org/web/20110704093604/http://neo.jpl.nasa.gov/news/news172.html |archivedate=4 July 2011 |deadurl=yes |df= }}</ref><ref name="SKY1"/><ref>{{cite web | url=http://news.nationalgeographic.com/news/2011/06/110627-asteroid-earth-close-pass-weiss-moon-space-science/ | title=Asteroid Just Buzzed Earth—Came Closer Than the Moon}}</ref> Although the object was initially believed to be [[space debris|space junk]], subsequent observations confirmed that it is an [[asteroid]].<ref name="SKY1" />
 
A few hours before the asteroid's nearest approach in 2011, it appeared close to the Sun, so observations were possible for only a brief period. Backyard astronomers were able to observe it with telescopes from Australia, southern Africa, and the Americas.<ref name="SKY1" />▼
 
== Description ==
[[File:2011 MD on Jun 26.jpg|thumb|left|{{mpfmp|2011 MD}} on 26 June 2011]]
 
▲Although {{mp|2011 MD}} was initially believed to be [[space debris|space junk]], subsequent observations confirmed that it is an asteroid. A few hours before the asteroid's nearest approach in 2011, it appeared close to the Sun, so observations were possible for only a brief period. Backyard astronomers were able to observe it with telescopes from Australia, southern Africa, and the Americas.<ref name="SKY1" />
 
{{mpfmp|2011 MD}} was discovered on June22, June 2011, by astronomers of the [[Lincoln Near-Earth Asteroid Research]] (LINEAR) pairat ofthe roboticU.S. telescopes[[Lincoln Laboratory Experimental Test Site]]in[[Socorro, New Mexico]], andby accordinga pair of robotic telescopes. According to original rough estimates, the asteroid's length was between {{convert|10|and|45|m|ft|-1|sp=us}}.<ref name="MPC-object" /><ref name="MANIA"/> However, according to the more recent [[Absolute magnitude#Solar System bodies (H)|absolute magnitude]] (H) measurement of 28.1<ref name="jpldata"/> and its albedo of 0.3, the asteroid is closer to 6 meters or 20 feet in diameter.<ref name="Mommert2014"/>
 
Emily Baldwin of ''[[Astronomy Now]]'' said that there was no threat of collision, and should the asteroid enter [[Earth's atmosphere]], it would "mostly burn up in a brilliant fireball, possibly scattering a few [[meteorite]]s", causing no likely harm to life or property on the ground.<ref name="MANIA" />
 
The June27, June 2011 close approach to Earth increased the orbital period of {{mpfmp|2011 MD}} from 380 days to 396 days. During close approach the asteroid passed Earth at a relative speed of 6.7&nbsp;km/s<ref name=jpldata/> with a [[geocentric]] eccentricity of 1.1.
 
{{mpfmp|2011 MD}} was observed by the [[Spitzer Space Telescope]] in February 2014 and estimated to be {{convert|6|m|0|sp=us}} in diameter.<ref name="NASA2014-195"/> The asteroid is a [[porous]] [[rubble pile]] with a density similar to water.<ref name="NASA2014-195"/>On19 June 19, 2014, NASA reported that asteroid {{mpfmp|2011 MD}} was a prime candidate for [[Asteroid capture|capture]] by the [[Asteroid Redirect Mission]] (ARM) in the early 2020s.<ref name="AP-20140619">{{cite news |last=Borenstein |first=Seth |title=Rock that whizzed by Earth may be grabbed by NASA |url=http://apnews.excite.com/article/20140619/us-sci-nasa-asteroid-4e7bba0551.html |date=June 19, 2014 |work=[[AP News]] |accessdate=June 20, 2014 }}</ref>
{| class=wikitable style="font-size: 0.9em;"
|- valign=top
!Parameter
Line 94 ⟶ 98:
|}
 
==Trajectory= plotsGallery ===
{{multiple image
| header =
| align = centerleft
| direction = horizontal
| total_width = 900
| image1 = Trajectory of near-Earth asteroid 2011 MD 1.gif
| width1 = 300
| alt1 =
| caption1 = Trajectory of {{mp|2011 MD}} projected onto the Earth's orbital plane. Note, from this viewing angle, the asteroid passes underneath the Earth.
| image2 = Trajectory of near-Earth asteroid 2011 MD 2.gif
| width2 = 300
| alt2 =
| caption2 = Trajectory of {{mp|2011 MD}} from the general direction of the Sun.
| footer =
| image3 = Spacious Structure of Asteroid 2011 MD (Artist's Concept).jpg
| width3 =
| alt3 =
| caption3 = Artist's concept of spacious structure of asteroid 2011 MD<ref>{{cite web |title=The Spacious Structure of Asteroid 2011 MD (Artist's Concept) |url=https://www.jpl.nasa.gov/images/pia18456-the-spacious-structure-of-asteroid-2011-md-artists-concept |website=NASA Jet Propulsion Laboratory (JPL) |access-date=13 April 2022}}</ref>
}}
{{clear|left}}
 
== See also ==
* [[Asteroid capture]]
* [[Asteroid Redirect Mission]]
* [[Near-Earth Object]]
 
== References ==
{{reflist|30em|refs=
 
| refs =
<ref name="jpldata">{{cite web
|type = 2014-02-12 last obs.
|title = JPL Small-Body Database Browser: (2011 MD)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3568303;cad=1
|publisher = [[Jet Propulsion Laboratory]]
|accessdate = 7 February 2018}}</ref>
 
<ref name="MPC-object">{{cite web
|title = 2011 MD
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2011+MD
|accessdate = 7 February 2018}}</ref>
 
<ref name="MPEC2011-M23">{{Cite web
Line 126 ⟶ 147:
|accessdate=2013-01-05}} (K11M00D)</ref>
 
<ref name="NASA-news">{{cite web|author=Don Yeomans |author2=Paul Chodas |name-list-style=amp |url=http://neo.jpl.nasa.gov/news/news172.html |title=Bend it Like Beckham! Small Asteroid to Whip Past Earth on June 27, 2011 |publisher=[[NASA]]/JPL Near-Earth Object Program Office |date=June 23, 2011 |accessdate=June 26, 2011 |archiveurl=https://web.archive.org/web/20110704093604/http://neo.jpl.nasa.gov/news/news172.html |archivedate=4 July 2011 |url-status=dead }}</ref>
<ref name="jpldata">{{cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011MD;cad=1 |title=JPL Small-Body Database Browser (2011 MD) |author=NASA [[Jet Propulsion Laboratory|JPL]] |accessdate= 31 March 2016 }}</ref>
 
<ref name="NatGeo">{{cite web | url=http://news.nationalgeographic.com/news/2011/06/110627-asteroid-earth-close-pass-weiss-moon-space-science/ | archive-url=https://web.archive.org/web/20110628180228/http://news.nationalgeographic.com/news/2011/06/110627-asteroid-earth-close-pass-weiss-moon-space-science/ | url-status=dead | archive-date=28 June 2011 | title=Asteroid Just Buzzed Earth—Came Closer Than the Moon}}</ref>
 
<ref name="SKY1">{{cite web |work= Sky & Telescope observing blog |url=http://www.skyandtelescope.com/community/skyblog/observingblog/124430479.html |title=Asteroid To Buzz Earth Monday, June 27th | author=Tony Flanders |date=June 23, 2011 |accessdate= June 27, 2011 }}</ref>
 
<ref name="MANIA">{{cite web |work= Skymania: Astronomy and space guide |url= http://www.skymania.com/wp/2011/06/incoming-new-asteroid-will-scrape-past.html | title= Incoming! Another asteroid to skim by |author= Paul Sutherland |date= June 23, 2011 |accessdate= June 26, 2011 | archiveurl= https://web.archive.org/web/20110701112135/http://www.skymania.com/wp/2011/06/incoming-new-asteroid-will-scrape-past.html | archivedate= 1 July 2011 <!|url--DASHBot-->|status= deadurl=dead no}}</ref>
 
<ref name="NASA2014-195">{{cite web |url=http://www.jpl.nasa.gov/news/news.php?release=2014-195 |title=NASA Announces Latest Progress in Hunt for Asteroids |author=NASA [[Jet Propulsion Laboratory|JPL]] |website=[[Jet Propulsion Laboratory]] |accessdate= 2014-06-19 }}</ref>
 
<ref name="Mommert2014">{{cite journal |title=Physical properties of near-earth asteroid 2011 MD |arxiv=1406.5253 |author=Mommert, M. |date= 2014 |journal=Astrophys. J. |volume=789 |issue=1 |page=L22 |display-authors=etal|bibcode = 2014ApJ...789L..22M |doi = 10.1088/2041-8205/789/1/L22 |s2cid=67851874 }}</ref>
 
}}
<ref name="AP-20140619">{{cite news |last=Borenstein |first=Seth |title=Rock that whizzed by Earth may be grabbed by NASA |url=http://apnews.excite.com/article/20140619/us-sci-nasa-asteroid-4e7bba0551.html |date=June 19, 2014 |work=[[AP News]] |accessdate=June 20, 2014 }}</ref>
 
}} <!-- end of reflist -->
 
== External links ==
{{Commons category|2011 MD}}
* [http://orbit.psi.edu/~tricaric/2011MD.html Encounter animations] {{Webarchive|url=https://web.archive.org/web/20180627144706/http://orbit.psi.edu/~tricaric/2011MD.html |date=27 June 2018 }} (Pasquale Tricarico)
* {{NeoDys|2011+MD}}
* {{ESA-SSA|2011MD}}
* {{JPL small body}}
 
<!--use upon numbering: {{Minor planets navigator | |number=? | }} -->
{{Small Solar System bodies}}
{{2011 in space}}
{{Authority control}}
 
{{DEFAULTSORT:2011 MD}}
[[Category:Apollo asteroids|#]]
[[Category:Amor asteroids|#]]
[[Category:UnnumberedMinor minorplanet planetsobject articles (unnumbered)]]
[[Category:ArticlesFast createdrotating viaminor the Article Wizardplanets|#]]
[[Category:Near-Earth objects in 2011|20110627]]
[[Category:Astronomical objects discovered in 2011|20110622]]
[[Category:Near-Earth objects in 2024]]

Retrieved from "https://en.wikipedia.org/wiki/2011_MD"
  




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