1840 Hus
{{Short description|Asteroid}}
{{Use dmy dates|date=December 2018}}
{{Infobox planet
| minorplanet = yes
| name = 1840 Hus
| background = #D6D6D6
| image = 001840-asteroid shape model (1840) Hus.png
| image_scale =
| caption = Shape model of Hus from its lightcurve
| discovered = 26 October 1971
| discoverer = L. Kohoutek
| discovery_site = Bergedorf Obs.
| mpc_name = (1840) Hus
| alt_names = 1971 UY{{·}}{{mp|1931 TS|3}}
1935 NC{{·}}1953 CG
| named_after = {{nowrap|Jan Hus {{small|(early Reformer)}}}}
| mp_category = main-belt{{·}}({{small|outer}})
Koronis
| epoch = 27 April 2019 (JD 2458600.5)
| uncertainty = 0
| observation_arc = 86.72 yr (31,673 d)
| aphelion = 2.9646 AU
| perihelion = 2.8731 AU
| semimajor = 2.9188 AU
| eccentricity = 0.0157
| period = 4.99 yr (1,821 d)
| mean_anomaly = 174.31°
| mean_motion = {{Deg2DMS|0.1976|sup=ms}} / day
| inclination = 2.4077°
| asc_node = 40.525°
| arg_peri = 14.250°
| mean_diameter = {{val|12.446|0.193|ul=km}}
{{val|12.592|0.123|u=km}}
| rotation = {{val|4.7483|0.0008|u=h}}
| albedo = {{val|0.2554|0.0232}}
{{val|0.261|0.043}}
| spectral_type = S {{small|(family-based)}}
}}
1840 Hus (prov. designation: {{mp|1971 UY}}) is a stony Koronis asteroid from the outer regions of the asteroid belt, approximately {{convert|12.5|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 26 October 1971, by Czech astronomer Luboš Kohoutek at the Bergedorf Observatory in Hamburg, Germany. The S-type asteroid has a rotation period of 4.8 hours and is likely elongated in shape. It was later named after 15th-century theologian Jan Hus.
Orbit and classification
Hus is a core member of the Koronis family ({{small|605}}), a very large asteroid family of almost 6,000 known asteroids with nearly co-planar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.9–3.0 AU once every 5 years (1,821 days; semi-major axis of 2.92 AU). Its orbit has an eccentricity of 0.02 and an inclination of 2° with respect to the ecliptic. Hus was first observed as {{mp|1931 TS|3}} at the Lowell Observatory in October 1931. The body's observation arc begins with its observation as {{mp|1953 CG}} at the Goethe Link Observatory in January 1953, more than 18 years prior to its official discovery observation at Hamburg.
Naming
This minor planet was named after Czech Jan Hus (1372–1415), a fifteenth century Bohemian theologian, rector of Charles University in Prague and forerunner of the protestant reformation. He was condemned to death by the Council of Constance and burned at the stake for his reformation ideas. Jan Hus is also known as John Huss in the English speaking world. The official {{MoMP|1840|naming citation}} was published by the Minor Planet Center on 20 December 1974 ({{small|M.P.C. 3757}}).
Physical characteristics
Based on the asteroid's membership to the Koronis family and its relatively high geometric albedo determined by the Wide-field Infrared Survey Explorer (WISE), Hus is very likely a stony S-type asteroid.
= Rotation period and pole =
In June 2006, a rotational lightcurve of Hus was obtained from photometric observations taken by Maurice Clark at the Chiro Observatory {{Obscode|320}} in Western Australia. Lightcurve analysis gave a rotation period of {{val|4.780|0.002}} hours with a high brightness variation of 0.85 magnitude ({{small|U=2-}}), strongly indicative of an elongated, non-spherical shape. In March 2016, a synthetic lightcurve gave a similar period of {{val|4.749057|0.000001}} hours, using sparse-in-time photometry data from the Lowell Photometric Database ({{small|U=n.a.}}). More recent lightcurve analysis during observations of the 1840 Hus apparition in 2020, from the MIT Koronis Family Asteroids Rotation Lightcurve Observing Program, gave a secure rotation period of {{val|4.7483|0.0008}} hours.
= Diameter and albedo =
According to the survey carried out by NASA's WISE telescope with its subsequent NEOWISE mission, Hus measures 12.4 and 12.6 kilometers in diameter, and its surface has an albedo of 0.261 and 0.255, respectively. Conversely, the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057, rather than one for a stony body, as indicated by WISE/NEOWISE – and calculates therefore a twice as large diameter of 25.4 kilometers, as the lower the albedo, the larger the body's diameter for a constant absolute magnitude.
References
{{reflist|30em|refs=
|type = 2018-06-30 last obs.
|title = JPL Small-Body Database Browser: 1840 Hus (1971 UY)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001840
|publisher = Jet Propulsion Laboratory
|access-date = 7 December 2018}}
|last = Schmadel | first = Lutz D.
|title = Dictionary of Minor Planet Names |publisher = Springer Berlin Heidelberg
|page = 147
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1841 |chapter = (1840) Hus }}
|title = 1840 Hus (1971 UY)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1840
|access-date = 7 December 2018}}
|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008)
|chapter = Appendix – Publication Dates of the MPCs
|last = Schmadel |first=Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 221
|isbn = 978-3-642-01964-7
|doi = 10.1007/978-3-642-01965-4|year = 2009
|chapter-url = https://cds.cern.ch/record/1339661
}}
|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
|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
|s2cid = 118745497 }}
|title = Asteroid (1840) Hus – Proper elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=1840&pc=1.1.6
|access-date = 20 October 2019}}
|title = Asteroid 1840 Hus
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1840+Hus
|access-date = 7 December 2018}}
|first1 = D. |last1 = Nesvorný
|first2 = M. |last2 = Broz
|first3 = V. |last3 = Carruba
|date = December 2014
|chapter = Identification and Dynamical Properties of Asteroid Families
|title = Asteroids IV
|pages = 297–321
|bibcode = 2015aste.book..297N
|doi = 10.2458/azu_uapress_9780816532131-ch016
|arxiv = 1502.01628
|isbn = 978-0-8165-3213-1|s2cid = 119280014
}}
|title = LCDB Data for (1840) Hus
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1840%7CHus
|access-date = 7 December 2018}}
|first1 = Stephen M. |last1 = Slivan
|first2 = Claire |last2 = McLellan-Cassivi
|first3 = Rila |last3 = Shishido
|first4 = Nieky |last4 = Wang
|date = April 2021
|title = Rotation Period of Koronis Family Member 1840 Hus
|journal = The Minor Planet Bulletin
|volume = 48
|issue = 2
|page = 112
|bibcode = 2021MPBu...48..112S
}}
|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= 7 December 2018}}
|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
|s2cid = 35447010 }} ([http://iopscience.iop.org/0004-637X/741/2/68/fulltext/apj398969t1_mrt.txt catalog])
|author = Clark, Maurice
|date = July 2010
|title = Asteroid Lightcurves from the Chiro Observatory
|journal = The Minor Planet Bulletin
|volume = 37
|issue = 3
|pages = 89–92
|issn = 1052-8091
|bibcode = 2010MPBu...37...89C
}}
|first1 = J. |last1 = Durech
|first2 = J. |last2 = Hanus
|first3 = D. |last3 = Oszkiewicz
|first4 = R. |last4 = Vanco
|date = March 2016
|title = Asteroid models from the Lowell photometric database
|journal = Astronomy and Astrophysics
|volume = 587
|page = 6
|bibcode = 2016A&A...587A..48D
|doi = 10.1051/0004-6361/201527573
|arxiv = 1601.02909
|s2cid = 118427201
}}
}}
External links
- [https://medium.com/@nathanmyhrvold/a-simple-guide-to-neowise-data-problems-a93f41e3bdb4#.6mhr3i1jj A Simple Guide to NEOWISE Data Problems], Nathan Myhrvold, 25 May 2016
- [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/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|1840}}
- {{JPL small body}}
{{Minor planets navigator |1839 Ragazza |number=1840 |1841 Masaryk}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Hus}}