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{{Use dmy dates|date=November 2018}}
{{Infobox planet
| minorplanet = yes
| name = 5682 Beresford
| background = #FA8072
|
|
| caption =
| discovery_ref =  <ref name="MPC-object" />
| discoverer = [[Robert McNaught|R. H. McNaught]]
| discovery_site = [[Siding Spring Observatory|Siding Spring Obs.]]
| discovered = 9 October 1990
|
| alt_names = 1990 TB{{·}}1969 PP<br />{{mp|1983 RV|5}}
|
| named_after = Tony Beresford <ref name="MPC-object" /><br />{{small|(Australian amateur astronomer)}}
| mp_category = [[Mars crosser]] <ref name="MPC-object" /><ref name="jpldata" /><ref name="lcdb" />
| orbit_ref =  <ref name="jpldata" />
| epoch = 27 April 2019 ([[Julian day|JD]] 2458600.5)
| uncertainty = 0
| observation_arc = 68.89 [[Julian year (astronomy)|yr]] (25,163 d)
| aphelion = 2.9826 [[Astronomical unit|AU]]
| perihelion = 1.6114 AU
| semimajor = 2.2970 AU
| eccentricity = 0.2985
| period = 3.48 yr (1,272 d)
| mean_anomaly = 77.335[[Degree (angle)|°]]
| mean_motion = {{Deg2DMS|0.2831|sup=ms}} / day
| inclination = 7.9606°
| asc_node = 212.78°
| arg_peri = 138.58°
| moid = 0.616 AU (240 [[Lunar distance (astronomy)|LD]])
| mean_diameter = {{val|4.125|0.661|ul=km}}<ref name="Nugent-2015" /><ref name="Mainzer-2016" /><br />{{val|5.66|u=km}} {{small|(calculated)}}<ref name="lcdb" /><br />{{val|7.33|0.73|u=km}}<ref name="Ali-Lagoa-2017" />
| rotation = {{val|3.769|0.005|ul=h}}{{efn|name=lcdb-Skiff-2011}}
| albedo = {{val|0.109}}<ref name="Ali-Lagoa-2017" /><br />{{val|0.20}} {{small|(assumed)}}<ref name="lcdb" /><br />{{val|0.365|0.145}}<ref name="Nugent-2015" /><ref name="Mainzer-2016" />
| spectral_type = [[S-type asteroid|S]] {{small|(assumed)}}<ref name="lcdb" />
| abs_magnitude = 13.60<ref name="jpldata" /><ref name="lcdb" /><ref name="Mainzer-2016" /><ref name="Nugent-2015" /><br />13.70<ref name="MPC-object" /><ref name="Ali-Lagoa-2017" />
}}
'''5682 Beresford''', provisional designation ''{{mp|1990 TB}}'' is a stony [[asteroid]] and sizable [[Mars-crosser]] from the inner regions of the [[asteroid belt]], approximately {{convert|6|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 9 October 1990, by astronomer [[Robert McNaught]] at the [[Siding Spring Observatory]] in Australia.<ref name="MPC-object" /> The assumed [[S-type asteroid]] has a short [[rotation period]] of 3.8 hours.<ref name="lcdb" /> It was named after Australian amateur astronomer {{MoMP|5682|Anthony Beresford}}.<ref name="MPC-object" />
== Orbit and classification ==
''Beresford'' is a member of the [[Mars-crossing asteroid]]s, a dynamically unstable [[List of minor-planet groups|group]] between the [[main belt]] and the [[near-Earth object|near-Earth]] populations, crossing the orbit of [[Mars]] at 1.66 [[Astronomical unit|AU]].<ref name="MPC-object" /> It orbits the Sun at a distance of 1.61–2.98 [[Astronomical unit|AU]] once every 3 years and 6 months (1,272 days; [[semi-major axis]] of 2.3 AU). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.30 and an [[orbital inclination|inclination]] of 8[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> The body's [[observation arc]] begins with a [[precovery]] taken at [[Palomar Observatory]] in November 1949, or almost 41 years prior to its official discovery observation at [[Siding Spring Observatory|Siding Spring]] in October 1990.<ref name="MPC-object" />
== Naming ==
This [[minor planet]] was named after Tony Beresford (Anthony Charles Beresford; born 1942), an Australian [[amateur astronomer]] who has been an active observer of [[artificial satellite]]s as part of the [[Operation Moonwatch]] program. He has also been instrumental in the distribution of astronomical information and discoveries in South Australia.<ref name="MPC-object" /> The name was suggested by [[Duncan I. Steel]] and the {{MoMP|5682|official citation}} was published by the [[Minor Planet Center]] on 2 April 1999 ({{small|[[Minor Planet Circulars|M.P.C.]] 34341}}).<ref name="MPC-Circulars-Archive" />
== Physical characteristics ==
''Beresford'' is an assumed, stony [[S-type asteroid]],<ref name="lcdb" /> the most common [[Asteroid spectral type|spectral type]] in the inner region of the [[Solar System]].
=== Rotation period ===
In October 2011, a rotational [[lightcurve]] of ''Beresford'' was obtained from [[Photometry (astronomy)|photometric]] observations by [[Brian Skiff]]. Lightcurve analysis gave a [[rotation period]] of {{val|3.769|0.005}} hours with a brightness variation of {{val|0.08|0.01}} [[Magnitude (astronomy)|magnitude]] ({{small|[[LCDB quality code|U=3-]]}}), indicative of a spherical shape.{{efn|name=lcdb-Skiff-2011}} The result supersedes an alternative period solution of {{val|7.536|0.002}} hours (twice the period) with an amplitude of {{val|0.20}} magnitude previously obtained by Robert A. Koff at the Antelope Hills Observatory {{Obscode|H09}} in Colorado in October 2004 ({{small|[[LCDB quality code|U=2]]}}).<ref name="Koff-2005" />{{efn|name=lightcurveplot-Koff}}
=== Diameter and albedo ===
According to the survey carried out by the [[NEOWISE]] mission of NASA's [[Wide-field Infrared Survey Explorer]], ''Beresford'' measures 4.13 kilometers in diameter and its surface has an [[astronomical albedo|albedo]] of 0.36(5).<ref name="Mainzer-2016" /><ref name="Nugent-2015" /> However, a 2017-WISE-study dedicated to Mars-crossing asteroids determined a larger diameter of 7.33 kilometers due to a much lower albedo of 0.109.<ref name="Ali-Lagoa-2017" /> The ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for as stony asteroid of 0.20 and derives a diameter of 5.66 kilometers based on an [[absolute magnitude]] of 13.6.<ref name="lcdb" />
==== Sizable Mars-crosser ====
With a diameter of up to 7.3 kilometers, ''Beresford'' is still one of the smaller "sizable" [[Mars-crossing asteroid]]s (5–15 km). These include [[3581 Alvarez]] (13.69 km) [[1065 Amundsenia]] (9.75 km), [[1139 Atami]] (9.35 km), [[3737 Beckman]] (14.36 km), [[1474 Beira]] (15.46 km), [[1011 Laodamia]] (7.39 km), [[1727 Mette]] (5.44 km), [[1131 Porzia]] (7.13 km), [[1235 Schorria]] (5.55 km), [[985 Rosina]] (8.18 km), [[1310 Villigera]] (15.24 km), and [[1468 Zomba]] (7 km), which are smaller than the largest members of this dynamical group, namely, [[132 Aethra]], [[323 Brucia]] (former Mars-crosser), [[1508 Kemi]], [[2204 Lyyli]] and [[512 Taurinensis]], all larger than 20 kilometers.
== Notes ==
{{notelist|refs=
{{efn|name=lcdb-Skiff-2011|1=[[Brian A. Skiff]] (2011) web, rotation period {{val|3.769|0.005}} hours with a brightness amplitude of {{val|0.08}} mag. Quality code is 3-. Summary figures for (5682) Beresford at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=5682%7CBeresford LCDB].}}
{{efn|name=lightcurveplot-Koff|1=[http://www.antelopehillsobservatory.org/Lightcurves/5682.gif Lightcurve plot of (5682) Beresford ], by Robert A. Koff at the Antelope Hills Observatory {{Obscode|H09}}. Rotation period: {{val|7.536|0.002}} hours with a brightness amplitude of {{val|0.20}} mag. Quality code is 2. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=5682%7CBeresford LCDB].}}
}} <!-- end of notelist -->
== References ==
{{reflist|30em|refs=
<ref name="jpldata">{{cite web
|type = 2018-10-22 last obs.
|title = JPL Small-Body Database Browser: 5682 Beresford (1990 TB)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005682
|publisher = [[Jet Propulsion Laboratory]]
|access-date = 9 November 2018}}</ref>
<ref name="MPC-object">{{cite web
|title = 5682 Beresford (1990 TB)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=5682
|access-date = 9 November 2018}}</ref>
<ref name="MPC-Circulars-Archive">{{cite web
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 9 November 2018}}</ref>
<ref name="lcdb">{{cite web
|title = LCDB Data for (5682) Beresford
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=5682%7CBeresford
|access-date = 9 November 2018}}</ref>
<ref name="Ali-Lagoa-2017">{{Cite journal
|first1 = V. |last1 = Alí-Lagoa
|first2 = M. |last2 = Delbo'
|date = July 2017
|title = Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data
|journal = Astronomy and Astrophysics
|volume = 603
|page = 8
|bibcode = 2017A&A...603A..55A
|doi = 10.1051/0004-6361/201629917
|arxiv = 1705.10263
}}</ref>
<ref name="Mainzer-2016">{{cite journal
|display-authors = 6
|first1 = A. K. |last1 = Mainzer
|first2 = J. M. |last2 = Bauer
|first3 = R. M. |last3 = Cutri
|first4 = T. |last4 = Grav
|first5 = E. A. |last5 = Kramer
|first6 = J. R. |last6 = Masiero
|first7 = C. R. |last7 = Nugent
|first8 = S. M. |last8 = Sonnett
|first9 = R. A. |last9 = Stevenson
|first10 = E. L. |last10 = Wright
|date = June 2016
|title = NEOWISE Diameters and Albedos V1.0
|url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab
|journal = NASA Planetary Data System
|pages = EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 |bibcode = 2016PDSS..247.....M
|access-date= 9 November 2018}}</ref>
<ref name="Nugent-2015">{{cite journal
|display-authors = 6
|first1 = C. R. |last1 = Nugent
|first2 = A. |last2 = Mainzer
|first3 = J. |last3 = Masiero
|first4 = J. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = T. |last6 = Grav
|first7 = E. |last7 = Kramer
|first8 = S. |last8 = Sonnett
|first9 = R. |last9 = Stevenson
|first10 = E. L. |last10 = Wright
|date = December 2015
|title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos
|journal = The Astrophysical Journal
|volume = 814
|issue = 2
|page = 13
|bibcode = 2015ApJ...814..117N
|doi = 10.1088/0004-637X/814/2/117
|arxiv = 1509.02522
}}</ref>
<ref name="Koff-2005">{{Cite journal
|author = Koff, Robert A.
|date = June 2005
|title = Lightcurve photometry of asteroids 212 Medea, 517 Edith, 3581 Alvarez 5682 Beresford, and 5817 Robertfrazer
|journal = The Minor Planet Bulletin
|volume = 32
|issue = 2
|pages = 32–34
|issn = 1052-8091
|bibcode = 2005MPBu...32...32K
}}</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 }})
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center
* [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=5682+Beresford Asteroid 5682 Beresford], Small Bodies Data Ferret
* {{AstDys|5682}}
* {{JPL small body}}
{{Minor planets navigator |5681 Bakulev |number=5682 |5683 Bifukumonin}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Beresford}}
[[Category:Mars-crossing asteroids|005682]]
[[Category:Discoveries by Robert H. McNaught]]
[[Category:Named minor planets]]
[[Category:Astronomical objects discovered in 1990|19901009]]
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