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词条 209P/LINEAR
释义

  1. 2014 passage

  2. Associated meteor showers

  3. References

  4. External links

{{Infobox Comet
| name=209P/LINEAR
| image= Comet 209P LINEAR in Ursa Major.jpg
| discoverer=LINEAR
1.0-m reflector
| discovery_date=3 February 2004 (asteroidal)
30 March 2004 (tail)
| designations=2004 CB
| epoch=2014-May-23
(JD 2456800.5)[2]
| Earth_moid = {{Convert|0.05|AU|km|abbr=on}}[3]
| semimajor=2.961 AU (a)
| perihelion=0.9695 AU (q)
| aphelion=4.952 AU (Q)
| eccentricity= 0.67258
| period=5.09 yr
| inclination=21.243°
| last_p=2014-May-06[4]
2009-Apr-15[4]
| next_p=2019-Jun-12[2]
}}

209P/LINEAR is a periodic comet discovered on 3 February 2004 by Lincoln Near-Earth Asteroid Research (LINEAR) using a {{convert|1.0|m|in|adj=on}} reflector. Initially it was observed without a coma and named 2004 CB as a minor planet or asteroid, but in March 2004 Robert H. McNaught observed a comet tail which confirmed it as a comet.[8] It was given the permanent number 209P on 12 December 2008 as it was the second observed appearance of the comet.[9] Prediscovery images of the comet, dating back to December 2003, were found during 2009.[8] Arecibo imaging in 2014 showed the comet nucleus is peanut shaped and about 2.4 km in diameter.[11][1] The comet has extremely low activity for its size and is probably in the process of evolving into an extinct comet.

209P/LINEAR was recovered on 31 December 2018 at magnitude 19.2 by Hidetaka Sato, but not officially announced yet.[2]

2014 passage

209P/LINEAR came to perihelion (closest approach to the Sun) on 6 May 2014.[4] On 29 May 2014 the comet passed {{convert|0.0554|AU|km mi|abbr=on|lk=on}} from Earth,[3] but only brightened to about apparent magnitude 12.[16] The 2014 Earth approach was the 9th closest known comet approach to Earth.[17]

Associated meteor showers

Preliminary results by Esko Lyytinen and Peter Jenniskens, later confirmed by other researchers, predicted[18][19][20] 209P/LINEAR might generate the next big meteor shower which would come from the constellation Camelopardalis on the night of 23/24 May 2014. It was possible that there could be 100 to 400 meteors per hour.[18] All the trails from the comet from 1803 through 1924 were expected to intersect Earth's orbit during May 2014.[18] The peak activity was expected to occur around 24 May 2014 7h UT when dust trails produced from past returns of the comet could pass {{convert|0.0002|AU|km mi|abbr=on|lk=on}} from Earth.[20] The 2014 Camelopardalids only generated 10–15 visual meteors per hour.[3][25] But the expected radiant and date of visual maximum were correctly predicted.[25] The shower peaked around 6h UT on 24 May 2014.[25] The Canadian Meteor Orbit Radar (CMOR) detected the shower using HF/VHF radar echos but the particles were too small for visual detection. Earth will encounter the 1939 stream around 24 May 2019 8h UT with a ZHR of ~5. The Eta Aquariids also occur at this time of year.[4]

209P/LINEAR may also be the source of the weak 6–14 June meteor shower "sigma Ursae Majorids" (SIM #677).[17]

References

1. ^{{cite tweet|user=AreciboRadar|author=Arecibo Radar|number=469988750110777345|date=23 May 2014|title=We saw comet 209P/LINEAR with radar! Looks like a narrow 2-kilometer bowling pin or peanut. Huzzah radar of comets!}}
2. ^http://www.aerith.net/comet/recovery.html
3. ^{{cite news|title=Camelopardalids meteor shower a bust, but not a surprise|url=https://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/05/24/camelopardalids-meteor-shower-a-bust-but-not-a-surprise/|accessdate=2014-05-24|newspaper=The Washington Post|at=10:07AM|date=2014-05-24}}
4. ^{{Cite web |url=http://www.imo.net/node/1556 |title=Meteor Activity Outlook for May 24-30, 2014 |access-date=2014-05-24 |archive-url=https://web.archive.org/web/20140525233231/http://www.imo.net/node/1556 |archive-date=2014-05-25 |dead-url=yes |df= }}
5. ^1 2 {{cite web |title=209P/LINEAR Orbit |url=http://www.minorplanetcenter.net/db_search/show_object?object_id=209P |publisher=Minor Planet Center |accessdate=2014-05-09}}
6. ^1 2 3 {{cite web |date=2011-10-31 |title=209P/LINEAR (NK 2142) |publisher=OAA Computing and Minor Planet Sections |author=Syuichi Nakano |author-link=Syuichi Nakano |url=http://www.oaa.gr.jp/~oaacs/nk/nk2142.htm |accessdate=2012-10-03}}
7. ^1 {{cite web |date=2008-12-12 |title=IAUC 9005: COMET P/2008 X4 = P/2003 K2 (CHRISTENSEN); 208P; V5580 Sgr |publisher=IAU Central Bureau for Astronomical Telegrams |url=http://www.cbat.eps.harvard.edu/iauc/09000/09005.html |accessdate=2012-10-03}} (password required)
8. ^1 2 3 {{cite web |title = The next big meteor shower |publisher = IMCCE |url = http://www.imcce.fr/langues/en/ephemerides/phenomenes/meteor/DATABASE/209_LINEAR/2014/index.php |accessdate = 2012-10-03 |archive-url = https://web.archive.org/web/20121006013453/http://www.imcce.fr/langues/en/ephemerides/phenomenes/meteor/DATABASE/209_LINEAR/2014/index.php |archive-date = 2012-10-06 |dead-url = yes |df = }}
9. ^1 {{cite web |title = 209P-ids 2014: prediction of activity |url = http://feraj.narod.ru/Radiants/Predictions/209p-ids2014eng.html |accessdate = 2014-04-13 |archive-url = https://web.archive.org/web/20140414185802/http://feraj.narod.ru/Radiants/Predictions/209p-ids2014eng.html |archive-date = 2014-04-14 |dead-url = yes |df = }}
10. ^1 2 {{Cite journal |last=Wiegert |first=Paul A. |authorlink=Paul Wiegert |author2=Quanzhi Ye |title=Will Comet 209P/LINEAR Generate the Next Meteor Storm? |journal=Monthly Notices of the Royal Astronomical Society |date=2013 |arxiv=1311.0235 |bibcode = 2014MNRAS.437.3283Y |doi = 10.1093/mnras/stt2127 }}
11. ^1 2 {{cite web |type=last observation: 2014-05-26; arc: 10.48 years |title=JPL Close-Approach Data: 209P/LINEAR |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=209P;cad=1#cad |accessdate=2012-10-03}}
12. ^1 {{cite web |title=455. COMET 209P/LINEAR P/2008 X2 |publisher=Earthrise Institute (Southwest Institute for Space Research) |author=Alan Hale |author-link=Alan Hale (astronomer) |url=http://www.earthriseinstitute.org/coms45.html#455 |accessdate=2012-10-03}}
13. ^1 2 {{cite web |title = 209P/LINEAR |work = Cometography |author = Gary W. Kronk |author-link = Gary W. Kronk |url = http://cometography.com/pcomets/209p.html |accessdate = 2014-05-03 |archive-url = https://web.archive.org/web/20140503132812/http://cometography.com/pcomets/209p.html |archive-date = 2014-05-03 |dead-url = yes |df = }}
14. ^1 2 3 {{cite web |title = Camelopardalids 2014: First Results |publisher = International Meteor Organization |url = http://www.imo.net/camelopardalids2014-results |archive-url = https://web.archive.org/web/20140525200210/http://www.imo.net/camelopardalids2014-results |dead-url = yes |archive-date = 2014-05-25 |accessdate = 2014-05-25}}
15. ^1 2 {{cite web |title=May Camelopardalids |publisher=SETI Institute |author=Peter Jenniskens |author-link=Peter Jenniskens |url=http://meteor.seti.org/ |accessdate=2014-05-25}}
16. ^1 {{cite web |date=2014-05-29 |title=Arecibo Observatory Sees Comet 209P/LINEAR |publisher=Universities Space Research Association (USRA) |url=http://www.usra.edu/news/pr/2014/comet209PLINEAR/ |accessdate=2014-05-29}}
[5][6][7][8][9][10][11][12][13][14][15][16]
}}

External links

  • Orbital simulation from JPL (Java) / Horizons Ephemeris
  • 209P/LINEAR – Seiichi Yoshida @ aerith.net
  • [https://web.archive.org/web/20140626173246/http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=c&o=0209P Elements and Ephemeris for 209P/LINEAR] – Minor Planet Center
  • 209P/LINEAR at the Minor Planet Center's Database
  • 209P/LINEAR – Kazuo Kinoshita (Dec. 21, 2008 )
  • [https://web.archive.org/web/20140525200210/http://www.imo.net/camelopardalids2014-results Camelopardalids 2014: First Results]
  • May Camelopardalids (SETI Institute / Peter Jenniskens)
  • [https://www.facebook.com/photo.php?v=714110968648132 May Camelopardalids Fireball as seen from Pennsylvania] via NASA Meteor Watch on Facebook
  • How Scientists Chased a New Meteor Shower from the Sky (Space.com June 10, 2014)
{{Comets}}{{PeriodicComets Navigator|208P/McMillan|210P/Christensen}}{{DEFAULTSORT:Linear, 209P}}

5 : Periodic comets|Discoveries by LINEAR|Meteor shower progenitors|May events|Astronomical objects discovered in 2004
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