View source for Astronomy:(251732) 1998 HG49

{{DISPLAYTITLE:{{mp|(251732) 1998 HG|49}}}}
{{Infobox planet
 | minorplanet     = yes
 | name            = {{mp|(251732) 1998 HG|49}}
 | background      = #FFC2E0
 | image           = 
 | image_size      = 
 | caption         = 
 | discovery_ref   = <ref name="jpldata" /><ref name="MPC-object" /><ref name=NeoDys/>
 | discoverer      = [[Astronomy:Spacewatch|Spacewatch]]
 | discovery_site  = {{nowrap|[[Astronomy:Kitt Peak National Observatory|Kitt Peak National Obs.]]}}
 | discovered      = 27 April 1998
 | mpc_name        = {{mp|(251732) 1998 HG|49}}
 | alt_names       = {{mp|1998 HG|49}}
 | pronounced      = 
 | named_after     = <!--xafter<br />{{small|()}}<ref name="MPC-object" />-->
 | mp_category     = {{Hlist
  | [[Astronomy:Amor asteroid|Amor]]
  | [[Astronomy:Near-Earth object|NEO]]<ref name="jpldata" /><ref name="MPC-object" />
  }}
 | orbit_ref       = <ref name="jpldata" />
 | epoch           = 4 September 2017 ([[Astronomy:Julian day|JD]]&nbsp;2458000.5)
 | uncertainty     = 0
 | observation_arc = 16.91&nbsp;yr (6,175&nbsp;days)
 | aphelion        = 1.3357&nbsp;[[Astronomy:Astronomical unit|AU]]
 | perihelion      = 1.0654&nbsp;AU
 | semimajor       = 1.2006&nbsp;AU
 | eccentricity    = 0.1126
 | period          = 1.32&nbsp;[[Astronomy:Julian year|yr]] (480&nbsp;days)
 | mean_anomaly    = 100.57[[Degree (angle)|°]]
 | mean_motion     = {{Deg2DMS|0.7493|sup=ms}} / day
 | inclination     = 4.1954°
 | asc_node        = 44.829°
 | arg_peri        = 324.29°
 | moid            = 0.0767&nbsp;AU (29.9&nbsp;[[Astronomy:Lunar distance|LD]])
 | mean_diameter   = 0.13–0.29&nbsp;km {{small|(estimate)}}<ref name=NeoDys />
 | rotation        = 
 | albedo          = 
 | spectral_type   = 
 | abs_magnitude   = {{Ubl
  | 21.7<ref name=jpldata/>
  | 21.8<ref name=NeoDys/>
  }}
}}
'''{{mp|(251732) 1998 HG|49}}''', provisional designation {{mp|1998 HG|49}}, is a sub-kilometer [[Astronomy:Asteroid|asteroid]] and [[Astronomy:Near-Earth object|near-Earth object]] of the [[Astronomy:Amor asteroid|Amor group]], approximately 200 meters in diameter. It was discovered on 27 April 1998 by astronomers of the [[Astronomy:Spacewatch|Spacewatch]] program at the [[Astronomy:Kitt Peak National Observatory|Kitt Peak National Observatory]] near Tucson, Arizona, United States.<ref name="MPC-object" />

== Description ==

{{mp|1998 HG|49}} is an [[Astronomy:Amor asteroid|Amor asteroid]] because its perihelion is less than 1.3&nbsp;[[Astronomy:Astronomical unit|AU]] and does not cross Earth's orbit. It is on a low-eccentricity and low-inclination orbit between the orbits of [[Astronomy:Earth|Earth]] and [[Astronomy:Mars|Mars]]. This is within a region of stability where bodies may survive for the age of the [[Astronomy:Solar System|Solar System]], and hence it may have formed near its current orbit.<ref name="Wyn-Evans-1999" />

The asteroid orbits the Sun at a distance of 1.1–1.3&nbsp;AU once every 1 year and 4 months (480 days; semi-major axis of 1.20&nbsp;AU). Its orbit has an [[Astronomy:Orbital eccentricity|eccentricity]] of 0.11 and an [[Astronomy:Orbital inclination|inclination]] of 4[[Degree (angle)|°]] with respect to the [[Astronomy:Ecliptic|ecliptic]].<ref name="jpldata" /> The body's [[Astronomy:Observation arc|observation arc]] begins with its official discovery observation at Kitt Peak in April 1998.<ref name="MPC-object" />

Between 1900 and 2200 its closest approach to Earth is more than 0.14&nbsp;AU.<ref name=jplapproach />

== Numbering and naming ==

This [[Astronomy:Minor planet|minor planet]] was [[Astronomy:Minor planet designation|numbered]] by the [[Organization:Minor Planet Center|Minor Planet Center]] on 28 November 2010.<ref name="MPC-Circulars-Archive" /> As of 2018, it has not been [[Astronomy:List of named minor planets (alphabetical)|named]].<ref name="MPC-object" />

== See also ==
* {{mpl|(225312) 1996 XB|27}}
* {{mpl|(350462) 1998 KG|3}}

== References ==
{{reflist|refs=

<ref name="jpldata">{{cite web
  |type       = 2015-03-24 last obs.
  |title      = JPL Small-Body Database Browser: 251732 (1998 HG49)
  |url        = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2251732;cad=1
  |publisher  = [[Organization:Jet Propulsion Laboratory|Jet Propulsion Laboratory]]
  |accessdate = 17 January 2018}}</ref>

<ref name="MPC-object">{{cite web
  |title      = 251732 (1998 HG49)
  |website       = Minor Planet Center
  |url        = https://www.minorplanetcenter.net/db_search/show_object?object_id=251732
  |accessdate = 17 January 2018}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web
  |title      = MPC/MPO/MPS Archive
  |website       = Minor Planet Center
  |url        = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
  |accessdate = 25 February 2018}}</ref>

<ref name=jplapproach>[https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=251732;orb=0;cov=0;log=0;cad=1#cad JPL close-approach data] Retrieved 2011-09-05</ref>

<ref name=NeoDys>[https://newton.spacedys.com/neodys2/index.php?pc=1.1.9&n=251732 NeoDys-2] Retrieved 2011-09-05</ref>

<ref name="Wyn-Evans-1999">{{Cite journal
  |first1     = N. Wyn |last1 = Evans
  |first2     = Serge |last2 = Tabachnik
  |date       = May 1999
  |title      = Possible long-lived asteroid belts in the inner Solar System
  |journal    = Nature
  |volume     = 399
  |issue      = 6731
  |page       = 41
  |bibcode    = 1999Natur.399...41E
  |doi        = 10.1038/19919
  |arxiv= astro-ph/9905067|s2cid = 4418335
 }}</ref>

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

== 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 }})
* {{NeoDys|251732}}
* {{ESA-SSA|251732|1998HG49}}
* {{JPL small body}}

{{Minor planets navigator | |number=251732 |PageName={{mp|(251732) 1998 HG|49}} | }}
{{Small Solar System bodies}}

{{DEFAULTSORT:1998 HG49}}
[[Category:Amor asteroids|251732]]
[[Category:Discoveries by the Spacewatch project|251732]]

{{Sourceattribution|(251732) 1998 HG49}}