View source for 61 Danaë

{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=July 2018}}
{{Infobox planet
| minorplanet     = yes
| name            = 61 Danaë
| background      = #D6D6D6
| image           = 61 Danae.gif
| image_scale      =
| caption         =
| discovery_ref   = &thinsp;<ref name="jpldata" />
| discoverer      = [[Hermann Goldschmidt|H. Goldschmidt]]
| discovery_site  = [[Paris]]
| discovered      = 9 September 1860
| mpc_name        = (61) Danaë
| alt_names       = {{mp|1953 RL|1}}{{·}}A917 SM
| pronounced      = {{IPAc-en|ˈ|d|æ|n|eɪ|.|iː}}<ref>{{Cite encyclopedia |url=http://www.lexico.com/definition/Danae |archive-url=https://web.archive.org/web/20200229231846/https://www.lexico.com/definition/danae |url-status=dead |archive-date=29 February 2020 |title=Danae |dictionary=[[Lexico]] UK English Dictionary |publisher=[[Oxford University Press]]}}</ref>
| adjective       = Danaëan {{IPAc-en|d|æ|n|eɪ|ˈ|iː|ə|n}}<ref>Charles Dickens (1852) ''Household Words'', p. 207</ref>
| named_after     = [[Danaë]] {{small|(Greek mythology)}}<ref name="springer" />
| mp_category     = [[main-belt]]{{·}}{{small|([[Kirkwood gap|outer]])}}&thinsp;<ref name="lcdb" /><br />[[Background asteroid|background]]&thinsp;<ref name="Ferret" />
| orbit_ref       = &thinsp;<ref name="jpldata" />
| epoch           = 4 September 2017 ([[Julian day|JD]] 2458000.5)
| uncertainty     = 0
| observation_arc = 151.67 yr (55,398 days)
| aphelion        = 3.4798 [[Astronomical unit|AU]]
| perihelion      = 2.4840 AU
| semimajor       = 2.9819 AU
| eccentricity    = 0.1670
| period          = 5.15 [[Julian year (astronomy)|yr]] (1,881 days)
| mean_anomaly    = 157.11[[Degree (angle)|°]]
| mean_motion     = {{Deg2DMS|0.1914|sup=ms}} / day
| inclination     = 18.212°
| asc_node        = 333.72°
| arg_peri        = 12.695°
| dimensions      = {{val|82.04|4.3}} km<ref name="SIMPS" /><br />{{val|82.52|2.73}} km<ref name="Carry-2012" /><br />{{val|83.56|1.02}} km<ref name="AKARI" /><br />{{val|85.125|1.962}} km<ref name="WISE" /><br />{{val|85.937|2.151}} km<ref name="Masiero-2014" /><br />{{val|91.00|3.50}} km<ref name="Masiero-2012" />
| mass            = {{val|2.89|2.78|e=18|u=kg}}<ref name="Carry-2012" />
| density         = {{val|9.81|9.49}} g/cm<sup>3</sup><ref name="Carry-2012" />
| rotation        = {{val|11.45}} [[Hour|h]]<ref name="Wood-1963" /><br />{{val|11.547|0.001}} h<ref name="geneva-obs" />
| albedo          = {{val|0.181|0.034}}<ref name="Masiero-2012" /><br />{{val|0.203|0.014}}<ref name="Masiero-2014" /><br />{{val|0.2065|0.0472}}<ref name="WISE" /><br />{{val|0.216|0.006}}<ref name="AKARI" /><br />{{val|0.2224|0.025}}<ref name="SIMPS" />
| spectral_type   = [[Tholen classification|Tholen]] {{=}} [[S-type asteroid|S]]&thinsp;<ref name="jpldata" /><br />[[SMASS classification|SMASS]] {{=}} [[S-type asteroid|S]]&thinsp;<ref name="jpldata" /><ref name="lcdb" /><br />[[Asteroid color indices|B–V]] {{=}} 0.852&thinsp;<ref name="jpldata" /><br />[[Asteroid color indices|U–B]] {{=}} 0.402&thinsp;<ref name="jpldata" />
| abs_magnitude   = {{val|7.56|0.10}}<ref name="Warner-2007i" />{{·}}7.68<ref name="jpldata" /><ref name="lcdb" /><ref name="SIMPS" /><ref name="AKARI" /><ref name="WISE" /><ref name="Masiero-2012" />{{·}}{{val|7.78|0.25}}<ref name="Veres-2015" />
}}
'''61 Danaë''' ({{IPAc-en|ˈ|d|æ|n|eɪ|.|iː}}) is a stony ([[S-type asteroid|S-type]]) [[asteroid]] in the outer [[asteroid belt]]'s [[Background asteroid|background population]], approximately 84 kilometer in diameter. It was discovered by French astronomer [[Hermann Goldschmidt]] on 9 September 1860, from his balcony in [[Paris]], France.<ref name="MPC-object" /> Goldschmidt was ill when asked to name the asteroid, and requested his fellow asteroid-hunter [[Robert Luther]] to name it instead. Luther chose to name it after [[Danaë]], the mother of [[Perseus]] in [[Greek mythology]].<ref name="springer" /> Danaë was the first asteroid to have a [[diacritical]] character in its official name.
The asteroid is orbiting the [[Sun]] with a period of 5.15&nbsp;years and is rotating on its axis once every 11.45&nbsp;hours. In 1985, a study of [[lightcurve]] data suggested that Danaë may have a [[asteroid moon|moon]]. If so, the main body would be an [[ellipsoid]] measuring {{convert|85|×|80|×|75|km|abbr=on}}, and the moon would orbit {{convert|101|km|mi}} away, measuring {{convert|55|×|30|×|30|km|abbr=on}}. The density of both would be {{val|1.1|u=g|up=cm3}}.<ref>{{Cite web |title=Other reports of asteroid/TNO companions |url=http://www.johnstonsarchive.net/astro/asteroidmoonsq.html |access-date=2022-09-13 |website=www.johnstonsarchive.net}}</ref>
== References ==
{{reflist|30em|refs=
<ref name="jpldata">{{cite web
|type       = 2017-04-30 last obs.
|title      = JPL Small-Body Database Browser: 61 Danae
|url        = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000061
|publisher  = [[Jet Propulsion Laboratory]]
|access-date = 2 November 2017}}</ref>
<ref name="springer">{{cite book
|title      = Dictionary of Minor Planet Names – (61) Danaë
|last       = Schmadel | first = Lutz D.
|publisher  = Springer Berlin Heidelberg
|page       = 21
|date       = 2007
|isbn       = 978-3-540-00238-3
|doi       = 10.1007/978-3-540-29925-7_62 |chapter       = (61) Danaë }}</ref>
<ref name="MPC-object">{{cite web
|title      = 61 Danae
|work       = Minor Planet Center
|url        = https://www.minorplanetcenter.net/db_search/show_object?object_id=61
|access-date = 2 November 2017}}</ref>
<ref name="geneva-obs">{{cite web
|title      = Asteroids and comets rotation curves – (61) Danaë
|last       = Behrend |first = Raoul
|publisher  = Geneva Observatory
|url        = http://obswww.unige.ch/~behrend/page1cou.html#000061
|access-date = 2 November 2017}}</ref>
<ref name="Masiero-2014">{{cite journal
|display-authors = 6
|first1     = Joseph R. |last1 = Masiero
|first2     = T. |last2 = Grav
|first3     = A. K. |last3 = Mainzer
|first4     = C. R. |last4 = Nugent
|first5     = J. M. |last5 = Bauer
|first6     = R. |last6 = Stevenson
|first7     = S. |last7 = Sonnett
|date       = August 2014
|title      = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
|url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M
|journal    = The Astrophysical Journal
|volume     = 791
|issue      = 2
|page       = 11
|bibcode    = 2014ApJ...791..121M
|doi        = 10.1088/0004-637X/791/2/121
|arxiv      = 1406.6645
|s2cid = 119293330 |access-date= 2 November 2017}}</ref>
<ref name="Ferret">{{cite web
|title      = Asteroid 61 Danae
|work       = Small Bodies Data Ferret
|url        = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=61+Danae
|access-date = 24 October 2019}}</ref>
<ref name="Carry-2012">{{Cite journal
|author     = Carry, B.
|date       = December 2012
|title      = Density of asteroids
|journal    = Planetary and Space Science
|volume     = 73
|issue      = 1
|pages      = 98–118
|bibcode    = 2012P&SS...73...98C
|doi        = 10.1016/j.pss.2012.03.009
|arxiv      = 1203.4336
|s2cid = 119226456
}} See Table 1.</ref>
<ref name="lcdb">{{cite web
|title      = LCDB Data for (61) Danaë
|publisher  = Asteroid Lightcurve Database (LCDB)
|url        = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=61%7CDanaë
|access-date = 2 November 2017}}</ref>
<ref name="Masiero-2012">{{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     = C. |last6 = Nugent
|first7     = M. S. |last7 = Cabrera
|date       = November 2012
|title      = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M
|journal    = The Astrophysical Journal Letters
|volume     = 759
|issue      = 1
|page       = 5
|bibcode    = 2012ApJ...759L...8M
|doi        = 10.1088/2041-8205/759/1/L8
|arxiv      = 1209.5794
|s2cid = 46350317 |access-date= 2 November 2017}}</ref>
<ref name="AKARI">{{cite journal
|display-authors = 6
|first1     = Fumihiko |last1 = Usui
|first2     = Daisuke |last2 = Kuroda
|first3     = Thomas G. |last3 = Müller
|first4     = Sunao |last4 = Hasegawa
|first5     = Masateru |last5 = Ishiguro
|first6     = Takafumi |last6 = Ootsubo
|first7     = Daisuke |last7 = Ishihara
|first8     = Hirokazu |last8 = Kataza
|first9     = Satoshi |last9 = Takita
|first10    = Shinki |last10 = Oyabu
|first11    = Munetaka |last11 = Ueno
|first12    = Hideo |last12 = Matsuhara
|first13    = Takashi |last13 = Onaka
|date       = October 2011
|title      = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey
|journal    = Publications of the Astronomical Society of Japan
|volume     = 63
|issue      = 5
|pages      = 1117–1138
|bibcode    = 2011PASJ...63.1117U
|doi        = 10.1093/pasj/63.5.1117
|doi-access=
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=61 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])</ref>
<ref name="SIMPS">{{cite journal
|first1     = E. F. |last1 = Tedesco
|first2     = P. V. |last2 = Noah
|first3     = M. |last3 = Noah
|first4     = S. D. |last4 = Price
|date       = October 2004
|title      = IRAS Minor Planet Survey V6.0
|url        = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab
|journal    = NASA Planetary Data System
|volume     = 12
|pages      = IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode    = 2004PDSS...12.....T
|access-date = 22 October 2019}}</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|s2cid = 118700974 }}</ref>
<ref name="Wood-1963">{{Cite journal
|first1     = X. H. John |last1 = Wood
|first2     = Gerard P. |last2 = Kuiper
|date       = May 1963
|title      = Photometric Studies of Asteroids.
|url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1963ApJ...137.1279W
|journal    = Astrophysical Journal
|volume = 137
|page       = 1279
|bibcode    = 1963ApJ...137.1279W
|doi        = 10.1086/147603
|access-date= 2 November 2017|doi-access= free
}}</ref>
<ref name="Warner-2007i">{{Cite journal
|author     = Warner, Brian D.
|date       = December 2007
|title      = Initial Results of a Dedicated H-G Project
|url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007MPBu...34..113W
|journal    = The Minor Planet Bulletin
|volume     = 34
|issue      = 4
|pages      = 113–119
|issn       = 1052-8091
|bibcode    = 2007MPBu...34..113W
|access-date= 2 November 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
|s2cid = 53493339 |access-date= 2 November 2017}}</ref>
}} <!-- end of reflist -->
{{Refbegin}}
* Alberto Cellino, Renato Pannunzio, [[Vincenzo Zappalà]], [[Paolo Farinella]], and Paolo Paolicchi, 1985, [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1985A%26A...144..355C&amp;db_key=AST&amp;data_type=HTML&amp;format=&amp;high=42c888df4627130 ''Do we observe light curves of binary asteroids?''], Astronomy and Astrophysics, Vol. 144, No. 2, pp.&nbsp;355&ndash;362.
{{Refend}}
== 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/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* {{AstDys|61}}
* {{JPL small body}}
{{Minor planets navigator |60 Echo |number=61 |62 Erato}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Danae}}
[[Category:S-type asteroids (SMASS)|000061]]
[[Category:S-type asteroids (Tholen)|000061]]
[[Category:Background asteroids|000061]]
[[Category:Discoveries by Hermann Goldschmidt]]
[[Category:Named minor planets]]
[[Category:Astronomical objects discovered in 1860|18600909]]