View source for Astronomy:(85640) 1998 OX4

{{DISPLAYTITLE:{{mp|(85640) 1998 OX|4}}}}
{{Infobox planet
 | minorplanet = yes
 | background = #FFC2E0
 | name = {{mp|(85640) 1998 OX|4}}
 | image = 
 | caption = 
 | discoverer = [[Astronomy:Spacewatch|Spacewatch]]
 | discovery_site  = [[Astronomy:Kitt Peak National Observatory|Kitt Peak National Obs.]]
 | discovered = 26 July 1998
 | mpc_name = {{mp|(85640) 1998 OX|4}}
 | alt_names = MPO 267962
 | mp_category = {{Hlist
  | [[Astronomy:Near-Earth object|NEO]]
  | [[Astronomy:Apollo asteroid|Apollo]]
  | [[Astronomy:Potentially hazardous object|PHA]]<ref name=jpldata/>
  | [[Astronomy:List of Mars-crossing minor planets|Mars crosser]]
  }}
| orbit_ref = <ref name=jpldata>{{Cite SBDB|title=(85640) 1998 OX4|id=2085640|access-date=7 April 2016}}</ref><ref name=AstDys>[https://newton.spacedys.com/astdys/index.php?pc=1.1.0&n=1998+OX4 AstDys-2 on 1998 OX4] Retrieved 2013-03-19</ref><ref name=NEODyS>[https://newton.spacedys.com/neodys2/index.php?pc=1.1.0&n=1998+OX4 NEODyS-2 on 1998 OX4] Retrieved 2013-03-19</ref>
| epoch = 13 January 2016 ([[Astronomy:Julian day|JD]]&nbsp;2457400.5)
| aphelion = {{Convert|2.347918212|AU|Gm|abbr=on|lk=on}}
| perihelion = {{Convert|0.81264205|AU|Gm|abbr=on}}
| semimajor = {{Convert|1.580280132|AU|Gm|abbr=on}}
| eccentricity = 0.4857608
| period = 1.99&nbsp;[[Astronomy:Julian year|yr]] (725.60&nbsp;[[Astronomy:Julian year|d]])
| inclination = 4.5134807°
| asc_node = 299.70814°
| arg_peri = 117.10906°
| mean_anomaly = 227.77555[[Degree (angle)|°]]
| dimensions = 300–600&nbsp;m{{ref label|A|a|none}}<ref>[https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html Absolute-magnitude conversion table (H)]</ref>
| mass = 
| density = 
| rotation = 
| albedo = 
| spectral_type = 
| abs_magnitude = 21.1<ref name=jpldata/>
| mean_motion = {{Deg2DMS|0.49613853|sup=ms}} / day
| observation_arc = 3656 days (10.01&nbsp;yr)
| uncertainty = 0
| moid = {{Convert|0.00103632|AU|km|abbr=on}}
| jupiter_moid = {{Convert|3.03959|AU|Gm|abbr=on}}
}}

'''{{mp|(85640) 1998 OX|4}}''' (provisional designation '''{{mp|1998 OX|4}}''') is a sub-kilometer [[Astronomy:Asteroid|asteroid]], classified as [[Astronomy:Near-Earth object|near-Earth object]] and [[Astronomy:Potentially hazardous asteroid|potentially hazardous asteroid]] of the [[Astronomy:Apollo asteroid|Apollo group]].

== Description ==

It was discovered on 26 July 1998 by the [[Astronomy:Spacewatch|Spacewatch]] program and subsequently lost. It was re-discovered by the [[Organization:Near-Earth Asteroid Tracking|Near-Earth Asteroid Tracking]] (NEAT) project on 31 August 2002, as {{mp|2002 PJ|34}}. It was removed from the [[Astronomy:Sentry (monitoring system)|Sentry Risk Table]] on 8 August 2002.<ref name="removed"/> It has a well determined orbit with an observation arc of more than 10 years. It is included in the [[Organization:Minor Planet Center|Minor Planet Center]] list of Potentially Hazardous Asteroids ([[Astronomy:Potentially hazardous asteroid|PHA]]s) as it comes to within 0.05&nbsp;AU of Earth periodically. It is also a [[Astronomy:List of Mars-crossing minor planets|Mars crossing asteroid]]

{|class="wikitable collapsible collapsed sortable"
|+H < 22 asteroids passing less than 1&nbsp;LD from Earth
!Asteroid
!Date
!Nominal approach distance (LD)
!Min. distance (LD)
!Max. distance (LD)
![[Astronomy:Absolute magnitude|Absolute magnitude]] (H)
!Size (meters)
|-bgcolor=#c2c2c2
|{{mpl|(152680) 1998 KJ|9}} || 1914-12-31 || 0.606 || 0.604 || 0.608 || 19.4 || 279–900
|-bgcolor=#c2c2c2
|{{mpl|(458732) 2011 MD|5}} || 1918-09-17 || 0.911 || 0.909 || 0.913 || 17.9 || 556–1795
|-bgcolor=#c2c2c2
|{{mpl|(163132) 2002 CU|11}} || 1925-08-30 || 0.903 || 0.901 || 0.905 || 18.5 || ''443–477''
|-bgcolor=#c2c2c2
|{{mpl|2002 JE|9}} || 1971-04-11 || 0.616 || 0.587 || 0.651 || 21.2 || 122–393
|-bgcolor=#c2c2c2
|{{mpl|2012 TY|52}} || 1981-11-04 || 0.818 || 0.813 || 0.823 || 21.4 || 111–358
|-bgcolor=#c2c2c2
|{{mpl|2017 VW|13}} || 2001-11-08 || 0.454 || 0.318 || 3.436 || 20.7 || 153–494
|-
|{{mpl|(308635) 2005 YU|55}} || 2011-11-08 || 0.845 || 0.845 || 0.845 || 21.9 || ''320–400''
|-bgcolor=#e2e2e2
|{{mpl|(153814) 2001 WN|5}} || 2028-06-26 || 0.647 || 0.647 || 0.647 || 18.2 || ''921–943''
|-bgcolor=#e2e2e2
|[[Astronomy:99942 Apophis|99942 Apophis]] || 2029-04-13 || 0.0981 || 0.0963 || 0.1000 || 19.7 || ''310–340''
|-bgcolor=#e2e2e2
|{{mpl|2005 WY|55}} || 2065-05-28 || 0.865 || 0.856 || 0.874 || 20.7 || 153–494
|-bgcolor=#e2e2e2
|{{mp|(308635) 2005 YU|55}} || 2075-11-08 || 0.592 || 0.499 || 0.752 || 21.9 || ''320–400''
|-bgcolor=#e2e2e2
|{{mpl|(456938) 2007 YV|56}} || 2101-01-02 || 0.621 || 0.615 || 0.628 || 21.0 || 133–431
|-bgcolor=#e2e2e2
|[[Astronomy:101955 Bennu|101955 Bennu]] || 2135-09-25 || 0.780 || 0.308 || 1.406 || 20.19 || ''472–512''
|-bgcolor=#e2e2e2
|{{mpl|(153201) 2000 WO|107}} || 2140-12-01 || 0.634 || 0.631 || 0.637 || 19.3 || ''427–593''
|-bgcolor=#e2e2e2
|'''{{mp|(85640) 1998 OX|4}}''' || '''2148-01-22''' || '''0.771''' || '''0.770''' || '''0.771''' || '''21.1''' || '''127–411'''
|-bgcolor=#e2e2e2
|{{mpl|2011 LT|17}} || 2156-12-16 || 0.998 || 0.955 || 1.215 || 21.6 || 101–327
|}

== See also ==
* [[Astronomy:99942 Apophis|99942 Apophis]]

== Notes ==
{{refbegin}}
* {{note label|A|a|none}} This is assuming an albedo of 0.25–0.05.
{{refend}}

== References ==
{{reflist|refs=

<ref name="removed">{{cite web
  |title=Date/Time Removed
  |publisher=NASA/JPL Near-Earth Object Program Office
  |url=http://neo.jpl.nasa.gov/risk/removed.html
  |archive-url=https://web.archive.org/web/20020602101400/http://neo.jpl.nasa.gov/risk/removed.html
  |url-status=dead
  |archive-date=2002-06-02
  |access-date=2014-02-01}}</ref>

}} <!-- end of reflist -->

== External links ==
* [http://www.minorplanetcenter.org/iau/lists/Apollos.html List Of Apollo Minor Planets], Minor Planet Center
* [https://www.minorplanetcenter.net/db_search/show_object?object_id=1998+OX4 {{mp|1998 OX|4}}] data at MPC
* [http://www.minorplanetcenter.org/iau/lists/Dangerous.html List of Potentially Hazardous Asteroids] (PHAs)
* {{NeoDys|85640}}
* {{ESA-SSA|85640|1998OX4}}
* {{JPL small body|id=85640}}

{{s-start}}
{{s-bef
| before = {{mpl|(153201) 2000 WO|107}}
}}
{{s-ttl
| title = Large [[Astronomy:Near-Earth object|NEO]] Earth close approach<br />(inside the orbit of the Moon)
| years = 22 January 2148
}}
{{s-aft
| after = 2011 LT<sub>17</sub>
}}
{{end}}

{{Minor planets navigator | |number=85640 |PageName={{mp|(85640) 1998 OX|4}} | }}
{{Small Solar System bodies}}

{{DEFAULTSORT:1998 OX4}}
[[Category:Apollo asteroids|085640]]
[[Category:Discoveries by the Spacewatch project|085640]]
[[Category:Potentially hazardous asteroids|085640]]

{{Sourceattribution|(85640) 1998 OX4}}