Editing Oort cloud (section)

== References ==
{{Reflist|30em|refs=
<ref name=book>{{cite book
 | author=Harold F. Levison
 | author2=Luke Donnes
 | chapter=Comet Populations and Cometary Dynamics
 | editor=Lucy Ann Adams McFadden
 | editor2=Lucy-Ann Adams
 | editor3=Paul Robert Weissman
 | editor4=Torrence V. Johnson
 | date=2007
 | title=Encyclopedia of the Solar System
 | pages=[https://archive.org/details/encyclopediaofso0000unse_u6d1/page/575 575–588]
 | edition=2nd
 | publisher=Academic Press
 | location=Amsterdam; Boston
 | isbn=978-0-12-088589-3
 | chapter-url=https://archive.org/details/encyclopediaofso0000unse_u6d1/page/575
 }}</ref>

<ref name=dave>{{cite journal
 |author=David C. Jewitt
 |date=2001
 |title=From Kuiper Belt to Cometary Nucleus: The Missing Ultrared Matter
 |journal=[[Astronomical Journal]]
 |volume= 123|issue= 2|pages=1039–1049
 |doi=10.1086/338692
|bibcode = 2002AJ....123.1039J
|s2cid=122240711
 |url=http://pdfs.semanticscholar.org/9b63/4b7bf2b08f6bafae8bbe61fec60d36de6346.pdf
 |archive-url=https://web.archive.org/web/20200503023241/http://pdfs.semanticscholar.org/9b63/4b7bf2b08f6bafae8bbe61fec60d36de6346.pdf
 |url-status=dead
 |archive-date=2020-05-03
 }}</ref>

<ref name="Donahue1991">{{cite book
 | editor = Thomas M. Donahue
 | others = Kathleen Kearney Trivers, and David M. Abramson
 | date = 1991
 | title = Planetary Sciences: American and Soviet Research, Proceedings from the U.S.–U.S.S.R. Workshop on Planetary Sciences
 | url = http://books.nap.edu/openbook.php?record_id=1790&page=R1
 | publisher = National Academy Press
 | page = 251
 | isbn = 978-0-309-04333-5
 | access-date = 2008-03-18
 | doi = 10.17226/1790
 | bibcode = 1991psas.conf.....D
 | archive-date = 2014-11-09
 | archive-url = https://web.archive.org/web/20141109193236/http://books.nap.edu/openbook.php?record_id=1790&page=R1
 | url-status = live
 }}</ref>

<ref name="emel2007">{{cite journal
 |author=V. V. Emelyanenko
 |author2=D. J. Asher
 |author3=M. E. Bailey
 |date=2007
 |title=The fundamental role of the Oort Cloud in determining the flux of comets through the planetary system
 |journal=[[Monthly Notices of the Royal Astronomical Society]]
 |volume=381 |issue=2 |pages=779–789
 |bibcode=2007MNRAS.381..779E
 |doi=10.1111/j.1365-2966.2007.12269.x
|doi-access=free
 |citeseerx=10.1.1.558.9946}}</ref>

<ref name="hills1981">{{cite journal
 |author=Jack G. Hills
 |date=1981
 |title=Comet showers and the steady-state infall of comets from the Oort Cloud
 |journal=[[Astronomical Journal]]
 |volume=86 |pages=1730–1740
 |bibcode=1981AJ.....86.1730H
 |doi=10.1086/113058
|doi-access=free
 }}</ref>

<ref name="Julio1997">{{cite journal
 |author=Julio A. Fernández
 |date=1997
 |title=The Formation of the Oort Cloud and the Primitive Galactic Environment
 |url=http://www.gps.caltech.edu/classes/ge133/reading/oort.pdf
 |journal=[[Icarus (journal)|Icarus]]
 |volume=219
 |issue=1
 |pages=106–119
 |access-date=2008-03-18
 |bibcode=1997Icar..129..106F
 |doi=10.1006/icar.1997.5754
 |archive-date=2012-07-24
 |archive-url=https://web.archive.org/web/20120724192955/http://www.gps.caltech.edu/classes/ge133/reading/oort.pdf
 |url-status=live
 }}</ref>

<ref name="levison2001">{{cite journal
 |author=Harold F. Levison
 |author2=Luke Dones
 |author3=Martin J. Duncan
 |date=2001
 |title=The Origin of Halley-Type Comets: Probing the Inner Oort Cloud
 |journal=[[Astronomical Journal]]
 |volume=121 |issue=4 |pages=2253–2267
 |bibcode=2001AJ....121.2253L
 |doi=10.1086/319943
|doi-access=free
 }}</ref>

<ref name="Morbidelli2006">{{cite arXiv
 |author=Alessandro Morbidelli
 |date=2006
 |title=Origin and dynamical evolution of comets and their reservoirs of water ammonia and methane
 |eprint=astro-ph/0512256
}}</ref>

<ref name="NASA_SSE_oort">{{cite web
 |title=Kuiper Belt & Oort Cloud
 | work = NASA Solar System Exploration web site
 |url=http://solarsystem.nasa.gov/planets/profile.cfm?Object=KBOs&Display=OverviewLong
 |archive-url=https://web.archive.org/web/20031226133830/http://www.solarsystem.nasa.gov/planets/profile.cfm?Object=KBOs&Display=OverviewLong
 |url-status=dead
 |archive-date=2003-12-26
 |publisher=[[NASA]] |access-date=2011-08-08
}}</ref>

<ref name="nasax">{{cite web|url=https://science.nasa.gov/science-news/science-at-nasa/2010/23nov_aliencomets/|title=The Sun Steals Comets from Other Stars|date=2010|publisher=NASA|access-date=2017-07-12|archive-date=2021-01-25|archive-url=https://web.archive.org/web/20210125015211/http://science.nasa.gov/science-news/science-at-nasa/2010/23nov_aliencomets|url-status=live}}</ref>

<ref name=Oort>{{cite journal
 |author=Jan Oort
 |title=The structure of the cloud of comets surrounding the Solar System and a hypothesis concerning its origin
 |journal=[[Bulletin of the Astronomical Institutes of the Netherlands]]
 |volume=11|pages=91–110|date=1950
 |bibcode=1950BAN....11...91O
}}</ref>

<ref name="Whipple">{{Cite journal
 | last1 = Whipple | first1 = F. L.  | author-link = Fred Lawrence Whipple
 | last2 = Turner | first2 = G.
 | last3 = McDonnell | first3 = J. A. M.
 | last4 = Wallis | first4 = M. K.
 | title = A Review of Cometary Sciences
 | journal = [[Philosophical Transactions of the Royal Society A]]
 | volume = 323 | issue = 1572 | pages = 339–347 [341]
 | date = 1987-09-30
 | bibcode = 1987RSPTA.323..339W
 | doi = 10.1098/rsta.1987.0090
| s2cid = 119801256 }}</ref>

<ref name="C1999F1">{{cite web
  | author=[[JPL Horizons On-Line Ephemeris System|Horizons]] output
  | url=https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271999+F1%27&TABLE_TYPE=%27ELEMENTS%27&START_TIME=%271950-01-01%27&STOP_TIME=%272050-01-01%27&STEP_SIZE=%27100%20years%27&CENTER=%27@0%27&OUT_UNITS=%27AU-D%27
  | title=Barycentric Osculating Orbital Elements for Comet C/1999 F1 (Catalina)
  | access-date=2021-06-01
  | archive-date=2021-06-02
  | archive-url=https://web.archive.org/web/20210602213432/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND='1999+F1'&TABLE_TYPE='ELEMENTS'&START_TIME='1950-01-01'&STOP_TIME='2050-01-01'&STEP_SIZE='100%20years'&CENTER='@0'&OUT_UNITS='AU-D'
  | url-status=live
  }} Solution using the Solar System [[Barycenter]]. Ephemeris Type:Elements and Center:@0 (To be outside planetary region, inbound epoch 1950 and outbound epoch 2050. For epoch 1950-Jan-01 orbit period is "PR= 1.6E+09 / 365.25 days" = ~4.3 million years)</ref>

}}