| 词条 | Padua family | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
The Padua family (FIN: 507), also known as the Lydia family, is a mid-sized family of asteroids of more than a thousand members. The family is at least 25 million years old. Its members were previously associated to 110 Lydia, and are predominantly X-type asteroids with an albedo of approximately 0.1. Together with the Agnia family, the Padua family is the only other family to have most of its members in a nonlinear secular resonance configuration with more than 75% of its members in a z1 librating state.[1][2]{{rp|23}} The Paduan (Lydian) asteroids are located in the outer part of the central asteroid belt having a semi-major axis of approximately 2.75. The family's namesake is the asteroid 363 Padua, while 110 Lydia is now a suspected interloper, despite having the same spectral type.[1]{{rp|23}} MembersSome prominent members with known spectral type.[1]{{rp|364}} A list of all Paduan aststeroids is given at the "Small Bodies Data Ferret".[7]
Lydia former namesake and potential interloperIn previous works (Zappala et al. 1995), this family was named Lydia after 110 Lydia, which is an X-type asteroid in the SMASS classification (Tholen: M-type). While Lydia is still a member of the now-called Padua family (Nesvorny 2005, AstDyS), it has been suspected that it might be an interloper in its "own" family despite its matching spectral type (Carruba 2009; Mothe-Diniz et al. 2005).[1]{{rp|369}} Also, the asteroid 308 Polyxo was formerly considered the family's largest member.[9] This T-type asteroid is no-longer considered a family member and is categorized as a background asteroid on AstDyS.[7][11] References1. ^1 2 3 4 {{Cite journal |author = Carruba, V. |date = May 2009 |title = The (not so) peculiar case of the Padua family |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MNRAS.395..358C |journal = Monthly Notices of the Royal Astronomical Society |volume = 395 |issue = 1 |pages = 358–377 |bibcode = 2009MNRAS.395..358C |doi = 10.1111/j.1365-2966.2009.14523.x |access-date= 31 August 2017}} [1][2][3][4][5]2. ^1 {{Cite journal |first1 = V. |last1 = Carruba |first2 = R. C. |last2 = Domingos |first3 = D. |last3 = Nesvorný |first4 = F. |last4 = Roig |first5 = M. E. |last5 = Huaman |first6 = D. |last6 = Souami |date = August 2013 |title = A multidomain approach to asteroid families' identification |url = https://arxiv.org/pdf/1305.4847.pdf |journal = Monthly Notices of the Royal Astronomical Society |volume = 433 |issue = 3 |pages = 2075–2096 |bibcode = 2013MNRAS.433.2075C |doi = 10.1093/mnras/stt884 |arxiv = 1305.4847 |accessdate = 30 August 2017}} 3. ^1 {{cite web |title = AstDyS-2 data for (308) Polyxo |publisher = AstDyS – Asteroids Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.6&n=308 |accessdate = 30 August 2017}} 4. ^1 2 {{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = http://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 22 July 2017 |deadurl = yes |archiveurl = https://web.archive.org/web/20170816000205/http://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |archivedate = 16 August 2017 |df = }} 5. ^1 {{cite web |title=Oxford Dictionary of Astronomy |last=Ridpath |first=Ian |publisher=Oxford University Press |date=2003 |url=https://books.google.com/books?id=O31j9UJ3U4oC&pg=PA282&lpg=PA282&dq=lydia+family+of+asteroids&source=bl&ots=cx6e1WvXia&sig=UNJ8TOleuF1MsWBJiMq3555giUE&hl=en&sa=X&ved=0ahUKEwjErNTRhsTKAhXL1R4KHRCcCiQQ6AEIOTAG#v=onepage&q=lydia%20family%20of%20asteroids&f=false | access-date=25 January 2016}} }} {{Small Solar System bodies}}{{DEFAULTSORT:Lydia Family}} 2 : Asteroid groups and families|Padua asteroids |
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