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{{Use dmy dates|date=August 2021}} |
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{{Infobox planet |
{{Infobox planet |
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| minorplanet = yes |
| minorplanet = yes |
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| name = 10370 Hylonome |
| name = 10370 Hylonome |
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| symbol = [[File:Hylonome symbol (bold).svg|24px]] (astrological) |
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| background = #C7FF8F |
| background = #C7FF8F |
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| image = |
| image = 10370 Hylonome Hubble.jpg |
||
| |
| image_scale = |
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| caption = |
| caption = [[Hubble Space Telescope]] image of Hylonome taken in 2009 |
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| discovery_ref = |
| discovery_ref = <ref name="MPC-object" /> |
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| ⚫ | |||
| discoverer = [[David C. Jewitt|D. C. Jewitt]]<br />[[Jane Luu|J. X. Luu]] |
| discoverer = [[David C. Jewitt|D. C. Jewitt]]<br />[[Jane Luu|J. X. Luu]] |
||
| discovery_site = [[Mauna Kea Observatory|Mauna Kea Obs.]] |
| discovery_site = [[Mauna Kea Observatory|Mauna Kea Obs.]] |
||
| ⚫ | |||
| mpc_name = (10370) Hylonome |
| mpc_name = (10370) Hylonome |
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| alt_names = {{mp|1995 DW|2}} |
| alt_names = {{mp|1995 DW|2}} |
||
| pronounced = {{IPAc-en|h|aɪ|ˈ|l|ɒ|n|ə|m|iː}} |
| pronounced = {{IPAc-en|h|aɪ|ˈ|l|ɒ|n|ə|m|iː}}<ref>Noah Webster (1884) ''A Practical Dictionary of the English Language''</ref> |
||
| named_after = [[Hylonome]]<br />{{small|([[Greek mythology]])}}<ref name="springer" /> |
| named_after = [[Hylonome|Ὑλονόμη]] ''Hylonomē''<br />{{small|([[Greek mythology]])}}<ref name="springer" /> |
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| mp_category = [[ |
| mp_category = [[Centaur (small Solar System body)|centaur]]<ref name="jpldata" />{{·}}[[Distant minor planet|distant]]<ref name="MPC-object" /><br />[[Neptune-crosser]]<br />[[List of Uranus-crossing minor planets|Uranus-grazer]] |
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| orbit_ref = |
| orbit_ref = <ref name="jpldata" /> |
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| epoch = 4 September 2017 ([[Julian day|JD]] 2458000.5) |
| epoch = 4 September 2017 ([[Julian day|JD]] 2458000.5) |
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| uncertainty = 3 |
| uncertainty = 3 |
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| Line 31: | Line 33: | ||
| jupiter_moid = 13.4570 AU |
| jupiter_moid = 13.4570 AU |
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| tisserand = 4.4550 |
| tisserand = 4.4550 |
||
| |
| mean_diameter = {{val|70|20|ul=km}}<ref name="spitzer" /><br />{{val|74|16}} km<ref name="Duffard-2014" /> |
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| rotation = |
| rotation = |
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| albedo = {{val|0.051|0.030}}<ref name="Duffard-2014 |
| albedo = {{val|0.051|0.030}}<ref name="Duffard-2014" /> |
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| spectral_type = [[ |
| spectral_type = [[Distant object spectral type|BR]] {{small|(intermed. blue-red)}}<ref name="lcdb" /><ref name="Belskaya-2015" /> |
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| abs_magnitude = 8.6<ref name="jpldata" />{{·}}{{val|9.08|0.04}} {{small|(R)}}<ref name="Bauer-2003" />{{·}}{{val|9.250|0.131}} {{small|(R)}}<ref name="Peixinho-2012" />{{·}}9.35<ref name="lcdb" /><ref name="Davies-1998b" />{{·}}{{val|9.51|0.08}}<ref name="Duffard-2014" />{{·}}9.53<ref name="Romanishin-1999" /><ref name="Romanishin-2005" /> |
| abs_magnitude = 8.6<ref name="jpldata" />{{·}}{{val|9.08|0.04}} {{small|(R)}}<ref name="Bauer-2003" />{{·}}{{val|9.250|0.131}} {{small|(R)}}<ref name="Peixinho-2012" />{{·}}9.35<ref name="lcdb" /><ref name="Davies-1998b" />{{·}}{{val|9.51|0.08}}<ref name="Duffard-2014" />{{·}}9.53<ref name="Romanishin-1999" /><ref name="Romanishin-2005" /> |
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}} |
}} |
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'''10370 Hylonome''' ({{IPAc-en|h|aɪ|ˈ|l|ɒ|n|ə|m|iː}}; |
'''10370 Hylonome''' ({{IPAc-en|h|aɪ|ˈ|l|ɒ|n|ə|m|iː}}; ''[[Minor planet provisional designation|prov. designation]]'': {{mp|1995 DW|2}}) is a [[minor planet]] orbiting in the [[outer Solar System]]. The dark and icy body belongs to the class of [[Centaur (small Solar System body)|centaur]]s and measures approximately {{convert|72|km|mi|abbr=off|sp=us|sigfig=2}} in diameter. It was discovered on 27 February 1995, by English astronomer [[David C. Jewitt]] and Vietnamese American astronomer [[Jane Luu]] at the U.S. [[Mauna Kea Observatory]] in Hawaii, and later named after the mythological creature [[Hylonome]].<ref name="springer" /><ref name="MPC-object" /> |
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It was discovered on 27 February 1995, by English astronomer [[David C. Jewitt]] and Vietnamese American astronomer [[Jane Luu]] at the U.S. [[Mauna Kea Observatory]] in Hawaii, and later named after the mythological creature [[Hylonome]].<ref name="springer" /><ref name="MPC-Hylonome" /> |
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== Classification and orbit == |
== Classification and orbit == |
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Centaurs are a large population of [[ |
Centaurs are a large population of [[Volatile (astrogeology)|icy]] bodies in transition between [[trans-Neptunian object]]s (TNOs) and [[Jupiter-family comet]]s (JFCs), their orbits being unstable due to [[Perturbation (astronomy)|perturbations]] by the [[giant planet]]s.<ref name="Duffard-2014" /> Currently, [[Uranus]] controls ''Hylonome''{{'}}s [[perihelion]] and [[Neptune]] its aphelion.<ref name=Horner-2004a /> |
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''Hylonome'' is a carbonaceous [[C-type asteroid|C-type]] body that orbits the Sun in the [[Kirkwood gap|outer]] main-belt at a distance of 18.9–31.4 [[Astronomical unit|AU]] once every 126 years and 2 months (46,073 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.25 and an [[orbital inclination|inclination]] of 4[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> It is a [[List of Neptune-crossing minor planets|Neptune-crosser]], and an |
''Hylonome'' is a carbonaceous [[C-type asteroid|C-type]] body that orbits the Sun in the [[Kirkwood gap|outer]] main-belt at a distance of 18.9–31.4 [[Astronomical unit|AU]] once every 126 years and 2 months (46,073 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.25 and an [[orbital inclination|inclination]] of 4[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> It is a [[List of Neptune-crossing minor planets|Neptune-crosser]], and an outer-grazer of the orbit of Uranus, which it hence does not [[List of Uranus-crossing minor planets|cross]]. Its [[minimum orbital intersection distance]] with Neptune and Uranus is 0.35854 and 0.52875 AU, respectively.<ref name="MPC-object" /> |
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It is estimated to have a relatively long orbital half-life of about 6.37 million years.<ref name="Horner-2004a" /> In the year 3478, it will pass within approximately 85 gigameters of Uranus and its [[semi-major axis]] will be reduced from 25.1 to 23.5 AU.<ref name="Hylonome3478" /> |
It is estimated to have a relatively long orbital half-life of about 6.37 million years.<ref name="Horner-2004a" /> In the year 3478, it will pass within approximately 85 gigameters of Uranus and its [[semi-major axis]] will be reduced from 25.1 to 23.5 AU.<ref name="Hylonome3478" /> |
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== Naming == |
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| ⚫ | This [[minor planet]] was named for [[Hylonome]], a female [[centaur]] in [[Greek mythology]]. In the epic tragedy, she lost her very much beloved husband, the handsome centaur [[Cyllarus]], who was accidentally killed by a spear. Heartbroken, she then took her own life to join him by throwing herself on the spear.<ref name="springer" /> The official {{MoMP|10370|naming citation}} was published on 26 July 2000 ({{small|[[Minor Planet Circulars|M.P.C.]] {{MoMP|10370|41030}}}}).<ref name="MPC-Circulars-Archive" /> |
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A symbol derived from that for [[2060 Chiron]], [[file:Hylonome symbol.svg|x14px]], was devised in the late 1990s by German astrologer Robert von Heeren. It replaces Chiron's K with a Greek capital [[upsilon]] (Υ) for Hylonome (''Ὑλονόμη'').<ref name=chironcomment>{{cite web |id=L2/21-225 |title=Comment on U+26B7 CHIRON |date=26 August 2021 |first1=Kirk |last1=Miller |first2=Zane |last2=Stein |url=https://www.unicode.org/L2/L2021/21225-chiron-comment.pdf}}</ref> |
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== Physical characteristics == |
== Physical characteristics == |
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Observations with the infrared ''[[Spitzer Space Telescope]]'' indicate a diameter of {{val|70|20}} kilometers,<ref name="spitzer" /> whereas the ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for carbonaceous bodies of 0.057, giving it a diameter of 75.1 kilometers with an [[absolute magnitude]] of 9.35.<ref name="lcdb" /> |
Observations with the infrared ''[[Spitzer Space Telescope]]'' indicate a diameter of {{val|70|20}} kilometers,<ref name="spitzer" /> whereas the ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for carbonaceous bodies of 0.057, giving it a diameter of 75.1 kilometers with an [[absolute magnitude]] of 9.35.<ref name="lcdb" /><ref>{{Cite journal |last1=Showalter |first1=Mark R. |last2=Benecchi |first2=Susan D. |last3=Buie |first3=Marc W. |last4=Grundy |first4=William M. |last5=Keane |first5=James T. |last6=Lisse |first6=Carey M. |last7=Olkin |first7=Cathy B. |last8=Porter |first8=Simon B. |last9=Robbins |first9=Stuart J. |last10=Singer |first10=Kelsi N. |last11=Verbiscer |first11=Anne J. |last12=Weaver |first12=Harold A. |last13=Zangari |first13=Amanda M. |last14=Hamilton |first14=Douglas P. |last15=Kaufmann |first15=David E. |date=2021 |title=A statistical review of light curves and the prevalence of contact binaries in the Kuiper Belt |url=https://linkinghub.elsevier.com/retrieve/pii/S0019103520304449 |journal=Icarus |language=en |volume=356 |pages=114098 |doi=10.1016/j.icarus.2020.114098|s2cid=225284888 |doi-access=free |arxiv=2105.03543 }}</ref> |
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A study in 2014, using data from ''Spitzer{{'}}s Multiband Imaging Photometer'' (MIPS) and ''[[Herschel Space Observatory|Herschel]]{{'}}s Photodetector Array Camera and Spectrometer'', gave a low [[astronomical albedo|albedo]] {{val|0.051|0.030}} and a diameter of {{val|74|16}} kilometers, based on an absolute [[Magnitude (astronomy)|magnitude]] of {{val|9.51|0.08}}. The study concluded that among the observed population of centaurs, there is no correlation between their sizes, albedos, and orbital parameters. However, the smaller the centaur, the more reddish it is.<ref name="Duffard-2014" /> |
A study in 2014, using data from ''Spitzer{{'}}s Multiband Imaging Photometer'' (MIPS) and ''[[Herschel Space Observatory|Herschel]]{{'}}s Photodetector Array Camera and Spectrometer'', gave a low [[astronomical albedo|albedo]] {{val|0.051|0.030}} and a diameter of {{val|74|16}} kilometers, based on an absolute [[Magnitude (astronomy)|magnitude]] of {{val|9.51|0.08}}. The study concluded that among the observed population of centaurs, there is no correlation between their sizes, albedos, and orbital parameters. However, the smaller the centaur, the more reddish it is.<ref name="Duffard-2014" /> |
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== |
== See also == |
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* {{Section link|List of centaurs (small Solar System bodies)|10370}} |
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| ⚫ | This [[minor planet]] was named for [[Hylonome]], a female [[centaur]] in [[Greek mythology]]. In the epic tragedy, she lost her very much beloved husband, the handsome centaur [[Cyllarus]], who was accidentally killed by a spear. Heartbroken, she then took her own life to join him by throwing herself on the spear.<ref name="springer" /> The official naming citation was published on 26 July 2000 ({{small|[[Minor Planet Circulars|M.P.C.]] {{MoMP|10370|41030}}}}).<ref name="MPC-Circulars-Archive" /> |
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== References == |
== References == |
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| Line 66: | Line 71: | ||
|type = 2010-06-14 last obs. |
|type = 2010-06-14 last obs. |
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|title = JPL Small-Body Database Browser: 10370 Hylonome (1995 DW2) |
|title = JPL Small-Body Database Browser: 10370 Hylonome (1995 DW2) |
||
|url = |
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2010370 |
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|publisher = [[Jet Propulsion Laboratory]] |
|publisher = [[Jet Propulsion Laboratory]] |
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|accessdate = 5 July 2017}}</ref> |
|accessdate = 5 July 2017}}</ref> |
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<ref name="springer">{{cite book |
<ref name="springer">{{cite book |
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|title = Dictionary of Minor Planet Names |
|title = Dictionary of Minor Planet Names |
||
|last = Schmadel | first = Lutz D. |
|last = Schmadel | first = Lutz D. |
||
|publisher = [[Springer Berlin Heidelberg]] |
|publisher = [[Springer Berlin Heidelberg]] |
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|chapter = (10370) Hylonome |
|||
|page = 731 |
|page = 731 |
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|date = 2007 |
|date = 2007 |
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|url = https://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_7947 |
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|isbn = 978-3-540-00238-3 |
|isbn = 978-3-540-00238-3 |
||
| |
|doi = 10.1007/978-3-540-29925-7_7947}}</ref> |
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<ref name="MPC- |
<ref name="MPC-object">{{cite web |
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|title = 10370 Hylonome (1995 DW2) |
|title = 10370 Hylonome (1995 DW2) |
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|work = Minor Planet Center |
|work = Minor Planet Center |
||
|url = |
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=10370 |
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|accessdate = 26 May 2016}}</ref> |
|accessdate = 26 May 2016}}</ref> |
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| Line 89: | Line 94: | ||
|title = MPC/MPO/MPS Archive |
|title = MPC/MPO/MPS Archive |
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|work = Minor Planet Center |
|work = Minor Planet Center |
||
|url = |
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |
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|accessdate = 26 May 2016}}</ref> |
|accessdate = 26 May 2016}}</ref> |
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| Line 95: | Line 100: | ||
|title = LCDB Data for (10370) Hylonome |
|title = LCDB Data for (10370) Hylonome |
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|publisher = Asteroid Lightcurve Database (LCDB) |
|publisher = Asteroid Lightcurve Database (LCDB) |
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|url = http://www.minorplanet.info/PHP/ |
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=10370%7CHylonome |
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|accessdate = 26 May 2016}}</ref> |
|accessdate = 26 May 2016}}</ref> |
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| Line 123: | Line 128: | ||
|bibcode = 2014A&A...564A..92D |
|bibcode = 2014A&A...564A..92D |
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|doi = 10.1051/0004-6361/201322377 |
|doi = 10.1051/0004-6361/201322377 |
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|arxiv = 1309.0946 |
|arxiv = 1309.0946 |
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|s2cid = 119177446 }}</ref> |
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<ref name="Davies-1998b">{{Cite journal |
<ref name="Davies-1998b">{{Cite journal |
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| Line 150: | Line 156: | ||
|pages = 129–132 |
|pages = 129–132 |
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|bibcode = 1999Natur.398..129R |
|bibcode = 1999Natur.398..129R |
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|doi = 10.1038/18168 |
|doi = 10.1038/18168 |
||
|s2cid = 4313184}}</ref> |
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<ref name="Romanishin-2005">{{Cite journal |
<ref name="Romanishin-2005">{{Cite journal |
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| Line 197: | Line 204: | ||
|doi = 10.1051/0004-6361/201219057 |
|doi = 10.1051/0004-6361/201219057 |
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|arxiv = 1206.3153 |
|arxiv = 1206.3153 |
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|s2cid = 55876118 |
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|accessdate = 26 May 2016}}</ref> |
|accessdate = 26 May 2016}}</ref> |
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| Line 224: | Line 232: | ||
|author6=David Trilling |
|author6=David Trilling |
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|author7=Jean-Luc Margot |
|author7=Jean-Luc Margot |
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|class=astro-ph |
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|eprint=astro-ph/0702538 |
|eprint=astro-ph/0702538 |
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|date=2007-02-20}}</ref> |
|date=2007-02-20}}</ref> |
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| Line 242: | Line 249: | ||
|arxiv = astro-ph/0407400 |
|arxiv = astro-ph/0407400 |
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|doi = 10.1111/j.1365-2966.2004.08240.x |
|doi = 10.1111/j.1365-2966.2004.08240.x |
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|s2cid = 16002759 |
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|accessdate = 5 August 2016}}</ref> |
|accessdate = 5 August 2016}}</ref> |
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| Line 250: | Line 258: | ||
|archiveurl=https://www.webcitation.org/5gOzJgt3v?url=http://home.comcast.net/~kpheider/Hylonome3478.txt |
|archiveurl=https://www.webcitation.org/5gOzJgt3v?url=http://home.comcast.net/~kpheider/Hylonome3478.txt |
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|archivedate=2009-04-29 |
|archivedate=2009-04-29 |
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| |
|url-status=dead |
||
| ⚫ | |||
|df= |
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| ⚫ | <br />{{cite web |url=http://chemistry.unina.it/~alvitagl/solex/ |title=The SOLEX page |archive-url=https://www.webcitation.org/5gOzK38bc?url=http://chemistry.unina.it/~alvitagl/solex/ |archive-date=2009-04-29}}</ref> |
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| ⚫ | |||
| ⚫ |
|
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}} <!-- end of reflist --> |
}} <!-- end of reflist --> |
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== External links == |
== External links == |
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* {{mp|10370 Hylonome}} as seen around [http://twitpic.com/h3udi 08 Sept 2009] by the new Hubble [[Wide Field Camera 3|WFC3]]. |
* {{mp|10370 Hylonome}} as seen around [http://twitpic.com/h3udi 08 Sept 2009] by the new Hubble [[Wide Field Camera 3|WFC3]]. |
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* [ |
* [https://minorplanetcenter.net//iau/lists/Centaurs.html List Of Centaurs and Scattered-Disk Objects], Minor Planet Center |
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* [ |
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs010001.html Discovery Circumstances: Numbered Minor Planets (10001)-(15000)] – Minor Planet Center |
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* [ |
* [https://newton.spacedys.com/astdys/index.php?pc=1.1.3.0&n=10370 AstDyS] – (10370) Hylonome Ephemerides |
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* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info]) |
* [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 }}) |
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* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books |
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books |
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* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – |
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Geneva Observatory, [[Raoul Behrend]] |
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* {{AstDys|10370}} |
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* {{JPL small body}} |
* {{JPL small body}} |
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{{Minor planets navigator|10369 Sinden|number=10370|10371 Gigli}} |
{{Minor planets navigator |10369 Sinden |number=10370 |10371 Gigli}} |
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{{Small Solar System bodies}} |
{{Small Solar System bodies}} |
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{{Authority control}} |
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{{DEFAULTSORT:Hylonome}} |
{{DEFAULTSORT:Hylonome}} |
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[[Category:Centaurs ( |
[[Category:Centaurs (small Solar System bodies)]] |
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[[Category:Numbered minor planets|010370]] |
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[[Category:Discoveries by David C. Jewitt]] |
[[Category:Discoveries by David C. Jewitt]] |
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[[Category:Discoveries by Jane Luu]] |
[[Category:Discoveries by Jane Luu]] |
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[[Category:Minor planets named from Greek mythology]] |
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[[Category:Named minor planets]] |
[[Category:Named minor planets]] |
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[[Category:Astronomical objects discovered in 1995|19950227]] |
[[Category:Astronomical objects discovered in 1995|19950227]] |
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Hubble Space Telescope image of Hylonome taken in 2009
| |
| Discovery[1] | |
|---|---|
| Discovered by | D. C. Jewitt J. X. Luu |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 27 February 1995 |
| Designations | |
| (10370) Hylonome | |
| Pronunciation | /haɪˈlɒnəmiː/[2] |
Named after | Ὑλονόμη Hylonomē (Greek mythology)[3] |
| 1995 DW2 | |
| centaur[4] · distant[1] Neptune-crosser Uranus-grazer | |
| Symbol |  (astrological) |
| Orbital characteristics[4] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter3 | |
| Observation arc | 15.27 yr (5,576 days) |
| Aphelion | 31.393 AU |
| Perihelion | 18.910 AU |
| 25.152 AU | |
| Eccentricity | 0.2482 |
| 126.14 yr (46,073 days) | |
| 63.271° | |
| 0° 0m 28.08s / day | |
| Inclination | 4.1443° |
| 178.08° | |
| 7.0279° | |
| Jupiter MOID | 13.4570 AU |
| TJupiter | 4.4550 |
| Physical characteristics | |
Mean diameter | 70±20 km[5] 74±16km[6] |
| 0.051±0.030[6] | |
| BR (intermed. blue-red)[7][8] | |
| 8.6[4] · 9.08±0.04 (R)[9] · 9.250±0.131 (R)[10] · 9.35[7][11] · 9.51±0.08[6] · 9.53[12][13] | |
10370 Hylonome (/haɪˈlɒnəmiː/; prov. designation: 1995 DW2) is a minor planet orbiting in the outer Solar System. The dark and icy body belongs to the class of centaurs and measures approximately 72 kilometers (45 miles) in diameter. It was discovered on 27 February 1995, by English astronomer David C. Jewitt and Vietnamese American astronomer Jane Luu at the U.S. Mauna Kea Observatory in Hawaii, and later named after the mythological creature Hylonome.[3][1]
Centaurs are a large population of icy bodies in transition between trans-Neptunian objects (TNOs) and Jupiter-family comets (JFCs), their orbits being unstable due to perturbations by the giant planets.[6] Currently, Uranus controls Hylonome'sperihelion and Neptune its aphelion.[14]
Hylonome is a carbonaceous C-type body that orbits the Sun in the outer main-belt at a distance of 18.9–31.4 AU once every 126 years and 2 months (46,073 days). Its orbit has an eccentricity of 0.25 and an inclination of 4° with respect to the ecliptic.[4] It is a Neptune-crosser, and an outer-grazer of the orbit of Uranus, which it hence does not cross. Its minimum orbital intersection distance with Neptune and Uranus is 0.35854 and 0.52875 AU, respectively.[1]
It is estimated to have a relatively long orbital half-life of about 6.37 million years.[14] In the year 3478, it will pass within approximately 85 gigameters of Uranus and its semi-major axis will be reduced from 25.1 to 23.5 AU.[15]
This minor planet was named for Hylonome, a female centaurinGreek mythology. In the epic tragedy, she lost her very much beloved husband, the handsome centaur Cyllarus, who was accidentally killed by a spear. Heartbroken, she then took her own life to join him by throwing herself on the spear.[3] The official naming citation was published on 26 July 2000 (M.P.C. 41030).[16]
A symbol derived from that for 2060 Chiron, 
, was devised in the late 1990s by German astrologer Robert von Heeren. It replaces Chiron's K with a Greek capital upsilon (Υ) for Hylonome (Ὑλονόμη).[17]
Observations with the infrared Spitzer Space Telescope indicate a diameter of 70±20 kilometers,[5] whereas the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous bodies of 0.057, giving it a diameter of 75.1 kilometers with an absolute magnitude of 9.35.[7][18]
A study in 2014, using data from Spitzer's Multiband Imaging Photometer (MIPS) and Herschel's Photodetector Array Camera and Spectrometer, gave a low albedo 0.051±0.030 and a diameter of 74±16 kilometers, based on an absolute magnitudeof9.51±0.08. The study concluded that among the observed population of centaurs, there is no correlation between their sizes, albedos, and orbital parameters. However, the smaller the centaur, the more reddish it is.[6]
