{{Short description|Asteroid}} {{Use dmy dates|date=July 2018}} {{Infobox planet | minorplanet = yes | name = 5380 Sprigg | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = <ref name="jpldata" /> | discovered = 7 May 1991 | discoverer = R. H. McNaught | discovery_site = Siding Spring Obs. | mpc_name = (5380) Sprigg | alt_names = 1991 JT{{·}}1983 JN<br />{{mp|1983 LA|1}} | pronounced = | named_after = Reg Sprigg<br />{{small|(Australian geologist)}}<ref name="springer" /> | mp_category = main-belt{{·}}{{small|(middle)}}<ref name="lcdb" /><br />background | orbit_ref = <ref name="jpldata" /> | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 35.92 yr (13,118 days) | aphelion = 3.1229 AU | perihelion = 2.0357 AU | semimajor = 2.5793 AU | eccentricity = 0.2108 | period = 4.14 yr (1,513 days) | mean_anomaly = 102.71° | mean_motion = {{Deg2DMS|0.2379|sup=ms}} / day | inclination = 9.3019° | asc_node = 242.31° | arg_peri = 358.90° | dimensions = {{val|6.606|0.290}} km<ref name="WISE" /><ref name="Masiero-2011" /><br />12.75 km {{small|(calculated)}}<ref name="lcdb" /> | rotation = {{val|3.219|0.002}} h<ref name="Clark-2014b" /> | albedo = 0.057 {{small|(assumed)}}<ref name="lcdb" /><br />{{val|0.280|0.025}}<ref name="WISE" /><ref name="Masiero-2011" /> | spectral_type = X<ref name="Veres-2015" />{{·}}C<ref name="lcdb" /> | abs_magnitude = 12.9<ref name="WISE" />{{·}}{{val|13.03|0.32}}<ref name="Veres-2015" />{{·}}13.2<ref name="jpldata" /><ref name="lcdb" /> }}
'''5380 Sprigg''', provisional designation ''{{mp|1991 JT}}'', is a background asteroid from the middle regions of the asteroid belt, approximately {{convert|7|km|mi|abbr=off|sp=us}} in diameter. It was discovered on 7 May 1991, by Australian astronomer Robert McNaught at Siding Spring Observatory in New South Wales, Australia.<ref name="MPC-Sprigg" /> It was named after Australian geologist Reg Sprigg.<ref name="springer" />
== Orbit and classification ==
''Sprigg'' is a non-family asteroid from the main belt's background population. It orbits the Sun in the central asteroid belt at a distance of 2.0–3.1 AU once every 4 years and 2 months (1,513 days). Its orbit has an eccentricity of 0.21 and an inclination of 9° with respect to the ecliptic.<ref name="jpldata" /> A first precovery was taken at Palomar Observatory in 1980, extending the body's observation arc by 11 years prior to its official discovery observation at Siding Spring.<ref name="MPC-Sprigg" />
== Naming ==
This minor planet was named after Reg Sprigg (1919–1994), Australian exploration geologist, oceanographer, biologist, author and conservationist. In 1946, he discovered the pre-Cambrian Ediacara biota, an assemblage of some of the most ancient animal fossils known. He is also the founder of the Arkaroola Wilderness Sanctuary which also hosts a small observatory. The naming was proposed by astronomer Duncan Steel.<ref name="springer" /> Naming citation was prepared by the Sprigg family and published on 11 April 1998 ({{small|M.P.C. 31609}}).<ref name="MPC-Circulars-Archive" />
== Physical characteristics ==
''Sprigg'' has been classified as an X-type asteroid by Pan-STARRS photometric survey.<ref name="Veres-2015" />
=== Rotation period ===
A rotational lightcurve of ''Sprigg'' was obtained from photometric observations by astronomer Maurice Clark at Texas Tech University in October 2013. Lightcurve analysis gave a rotation period of 3.219 hours with a brightness amplitude of 0.68 magnitude, indicating that the body has a non-spheroidal shape ({{small|U=3-}}).<ref name="Clark-2014b" />
=== Diameter and albedo ===
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, ''Sprigg'' measures 6.606 kilometers in diameter and its surface has an albedo of 0.280,<ref name="WISE" /><ref name="Masiero-2011" /> while the ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a larger diameter of 12.75 kilometers with an absolute magnitude of 13.2.<ref name="lcdb" />
== References == {{reflist|30em|refs=
<ref name="jpldata">{{cite web |type = 2016-09-13 last obs. |title = JPL Small-Body Database Browser: 5380 Sprigg (1991 JT) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005380 |publisher = Jet Propulsion Laboratory |access-date = 20 June 2017}}</ref>
<ref name="springer">{{cite book |title = Dictionary of Minor Planet Names – (5380) Sprigg |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 460 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_5173 |chapter = (5380) Sprigg }}</ref>
<ref name="MPC-Sprigg">{{cite web |title = 5380 Sprigg (1991 JT) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=5380 |access-date = 29 March 2017}}</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 = 29 March 2017}}</ref>
<ref name="Masiero-2011">{{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = J. |last6 = Dailey |first7 = P. R. M. |last7 = Eisenhardt |first8 = R. S. |last8 = McMillan |first9 = T. B. |last9 = Spahr |first10 = M. F. |last10 = Skrutskie |first11 = D. |last11 = Tholen |first12 = R. G. |last12 = Walker |first13 = E. L. |last13 = Wright |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T. IV |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = A. |last18 = Wilkins |date = November 2011 |title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 20 |bibcode = 2011ApJ...741...68M |doi = 10.1088/0004-637X/741/2/68 |arxiv = 1109.4096 |access-date= 29 March 2017}}</ref>
<ref name="lcdb">{{cite LCDB|number = 5380 |access-date = 29 March 2017}}</ref>
<ref name="WISE">{{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407}}</ref>
<ref name="Clark-2014b">{{Cite journal |author = Clark, Maurice |date = July 2014 |title = Asteroid Photometry from the Preston Gott Observatory |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..178C |journal = The Minor Planet Bulletin |volume = 41 |issue = 3 |pages = 178–183 |issn = 1052-8091 |bibcode = 2014MPBu...41..178C |access-date= 29 March 2017}}</ref>
<ref name="Veres-2015">{{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 29 March 2017}}</ref>
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== 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 * [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center * {{AstDys|5380}} * {{JPL small body}}
{{Minor planets navigator|5379 Abehiroshi |number= 5380 |5381 Sekhmet}} {{Small Solar System bodies}} {{Authority control}}
{{DEFAULTSORT:Sprigg}} 005380 Category:Discoveries by Robert H. McNaught Category:Named minor planets 19910507