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{{Short description|Periodic comet with 7 year orbit}} |
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{{Infobox Comet |
{{Infobox Comet |
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| name=168P/Hergenrother |
| name=168P/Hergenrother |
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| Line 13: | Line 14: | ||
| period=6.923 [[Julian year (astronomy)|a]] |
| period=6.923 [[Julian year (astronomy)|a]] |
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| inclination= 21.8934° |
| inclination= 21.8934° |
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| last_p=October 1, 2012<ref name="NK1778"/><br>November 2, 2005 |
| last_p=August 5, 2019<ref name=MPC/><ref name="NK2283"/><br/>October 1, 2012<ref name="NK1778"/><br />November 2, 2005 |
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| next_p= |
| next_p=2026-May-18<ref name=MPC/> |
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| Earth_moid={{Convert|0.4|AU|e6km|abbr=unit|lk=on}} |
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}} |
}} |
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| ⚫ |
'''168P/Hergenrother''' is a [[List of periodic comets|periodic]] [[comet]] in the [[ |
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| ⚫ | '''168P/Hergenrother''' is a [[List of periodic comets|periodic]] [[comet]] in the [[Solar System]]. The comet originally named '''P/1998 W2''' returned in 2005 and got the temporary name '''P/2005 N2'''.<ref name="recovery"/> The comet was last observed in January 2020,<ref name=MPC/> and may have continued fragmenting after the 2012 outburst. |
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| ⚫ |
The comet came to [[Apsis|perihelion]] on |
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== 2012 outburst == |
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| ⚫ | The comet came to [[Apsis|perihelion]] on October 1, 2012,<ref name="NK1778"/> and was expected to reach about [[apparent magnitude]] 15.2, but due to an outburst the comet reached apparent magnitude 8.<ref name="Yoshida-2012"/> As a result of the outburst of gas and dust, the comet was briefly more than 500 times brighter than it would have been without the outburst.<ref name=outburst-math/> On October 19, 2012, images by the [[Virtual Telescope Project]] showed a dust cloud trailing the nucleus.<ref name="VT168P"/> Images by the {{convert|2|m|in|abbr=on}} [[Faulkes Telescope North]] on October 26, 2012, confirm a [[Comet nucleus#Splitting|fragmentation event]].<ref name="Faulkes"/> The secondary fragment was about magnitude 17. Further observations by the {{convert|8.1|m|in|abbr=on}} [[Gemini telescope]] show that the comet fragmented into at least four parts.<ref name="badastronomy"/> |
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== 2019 == |
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168P came to perihelion on August 5, 2019,<ref name=MPC/> when it was 76 degrees from the Sun. It then made a closest approach to Earth on 6 November 6, 2019, when it was {{Convert|1|AU|e6km|abbr=unit|lk=on}} from Earth with a [[solar elongation]] of about 110 degrees. It was not recovered until January 3, 2020, when it was 141 degrees from the Sun, but only two observations on a single night were reported. |
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== References == |
== References == |
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<ref name="NK1778">{{cite web |
<ref name="NK1778">{{cite web |
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|date=2009-04-23 |
|date=2009-04-23 |
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|title=168P/Hergenrother |
|title=168P/Hergenrother (NK 1778) |
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|publisher=OAA Computing and Minor Planet Sections |
|publisher=OAA Computing and Minor Planet Sections |
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|author=Syuichi Nakano |
|author=Syuichi Nakano |
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|author-link=Syuichi Nakano |
|author-link=Syuichi Nakano |
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|url=http://www.oaa.gr.jp/~oaacs/nk/nk1778.htm |
|url=http://www.oaa.gr.jp/~oaacs/nk/nk1778.htm |
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| |
|access-date=2012-02-20 |
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}}</ref> |
}}</ref> |
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<ref name="NK2283">{{cite web |
<ref name="NK2283">{{cite web |
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|date=2012-07-17 |
|date=2012-07-17 |
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|title=168P/Hergenrother |
|title=168P/Hergenrother (NK 2283) |
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|publisher=OAA Computing and Minor Planet Sections |
|publisher=OAA Computing and Minor Planet Sections |
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|author=Syuichi Nakano |
|author=Syuichi Nakano |
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|author-link=Syuichi Nakano |
|author-link=Syuichi Nakano |
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|url=http://www.oaa.gr.jp/~oaacs/nk/nk2283.htm |
|url=http://www.oaa.gr.jp/~oaacs/nk/nk2283.htm |
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| |
|access-date=2012-10-13 |
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}}</ref> |
}}</ref> |
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|author=Seiichi Yoshida |
|author=Seiichi Yoshida |
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|url=http://www.aerith.net/comet/catalog/0168P/2012.html |
|url=http://www.aerith.net/comet/catalog/0168P/2012.html |
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| |
|access-date=2012-02-25 |
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}}</ref> |
}}</ref> |
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| Line 63: | Line 70: | ||
|author-link=Gianluca Masi |
|author-link=Gianluca Masi |
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|url=http://www.virtualtelescope.eu/2012/10/22/comet-168phergenrother-hi-res-images-19-oct-2012/ |
|url=http://www.virtualtelescope.eu/2012/10/22/comet-168phergenrother-hi-res-images-19-oct-2012/ |
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| |
|access-date=2016-10-18 |
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}}</ref> |
}}</ref> |
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<ref name="Faulkes">{{cite web |
<ref name="Faulkes">{{cite web |
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|author-link=Giovanni Sostero |
|author-link=Giovanni Sostero |
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|author2=Nick Howes |
|author2=Nick Howes |
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|author2-link= |
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|author3=Ernesto Guido |
|author3=Ernesto Guido |
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|url=http://remanzacco.blogspot.it/2012/10/splitting-event-in-comet.html |
|url=http://remanzacco.blogspot.it/2012/10/splitting-event-in-comet.html |
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| |
|access-date=2012-10-28 |
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}}</ref> |
}}</ref> |
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<ref name="badastronomy">{{cite web |
<ref name="badastronomy">{{cite web |
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|date=2012-11-05 |
|date=2012-11-05 |
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|title=Breaking up is easy to do. If |
|title=Breaking up is easy to do. If you're a comet. |
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|publisher=Bad Astronomy |
|publisher=Bad Astronomy |
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|author=Phil Plait |
|author=Phil Plait |
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|author-link=Phil Plait |
|author-link=Phil Plait |
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|url=http://blogs.discovermagazine.com/badastronomy/2012/11/05/breaking-up-is-easy-to-do-if-youre-a-comet/ |
|url=http://blogs.discovermagazine.com/badastronomy/2012/11/05/breaking-up-is-easy-to-do-if-youre-a-comet/ |
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| |
|access-date=2012-11-05 |
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|archive-date=2012-11-08 |
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|archive-url=https://web.archive.org/web/20121108035433/http://blogs.discovermagazine.com/badastronomy/2012/11/05/breaking-up-is-easy-to-do-if-youre-a-comet/ |
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|url-status=dead |
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}}</ref> |
}}</ref> |
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|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=168P |
|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=168P |
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|publisher=[[Minor Planet Center]] |
|publisher=[[Minor Planet Center]] |
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| |
|access-date=2014-06-20 |
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}}</ref> |
}}</ref> |
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== External links == |
== External links == |
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* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=168P;orb=1 Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=168P Horizons Ephemeris] |
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* [http://www.aerith.net/comet/catalog/0168P/index.html 168P on Seiichi Yoshida's comet list] |
* [http://www.aerith.net/comet/catalog/0168P/index.html 168P on Seiichi Yoshida's comet list] |
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* [http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=c&o=0168P Elements and Ephemeris for 168P/Hergenrother] – [[Minor Planet Center]] |
* [https://web.archive.org/web/20121011233959/http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=c&o=0168P Elements and Ephemeris for 168P/Hergenrother] – [[Minor Planet Center]] |
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* [http://cometography.com/pcomets/168p.html 168P at Kronk's Cometography] |
* [https://web.archive.org/web/20111123035636/http://cometography.com/pcomets/168p.html 168P at Kronk's Cometography] |
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* [https://www.youtube.com/watch?v=aFcwzQe_hHc Comet 168P Hergenrother in outburst] (Google+ chat archive Oct 12, 2012) |
* [https://www.youtube.com/watch?v=aFcwzQe_hHc Comet 168P Hergenrother in outburst] (Google+ chat archive Oct 12, 2012) |
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* [http://transientsky.wordpress.com/2012/10/20/comet-hergenrother-in-outburst/ Comet Hergenrother in Outburst] (Carl Hergenrother : 20 Oct 2012) |
* [http://transientsky.wordpress.com/2012/10/20/comet-hergenrother-in-outburst/ Comet Hergenrother in Outburst] (Carl Hergenrother : 20 Oct 2012) |
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* [http://podideployment.blogspot.co.uk/2012/10/a-comet.html Comet 168P and fragment] as seen by [[Kitt Peak National Observatory|Kitt Peak]] [[WIYN Observatory|WIYN]] {{convert|3.5|m|in|adj=on}} on 30 Oct 2012 |
* [http://podideployment.blogspot.co.uk/2012/10/a-comet.html Comet 168P and fragment] as seen by [[Kitt Peak National Observatory|Kitt Peak]] [[WIYN Observatory|WIYN]] {{convert|3.5|m|in|adj=on}} on 30 Oct 2012 |
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* [http://www.jpl.nasa.gov/news/news.php?release=2012-349 Scientists Monitor Comet Breakup] (168P-Hergenrother was imaged by the NOAO/[[Gemini telescope]] Nov. 2, 2012) |
* [http://www.jpl.nasa.gov/news/news.php?release=2012-349 Scientists Monitor Comet Breakup] (168P-Hergenrother was imaged by the NOAO/[[Gemini telescope]] Nov. 2, 2012) |
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* [ |
* [https://arxiv.org/abs/1409.7641 Temporal Correlation Between Outbursts and Fragmentation Events of Comet 168P/Hergenrother] ([[arXiv]]:1409.7641 : 26 Sep 2014) |
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{{Comets}} |
{{Comets}} |
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{{2019 in space}} |
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{{PeriodicComets Navigator|167P/CINEOS|169P/NEAT}} |
{{PeriodicComets Navigator|167P/CINEOS|169P/NEAT}} |
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{{Authority control}} |
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{{DEFAULTSORT:Hergenrother, 168P}} |
{{DEFAULTSORT:Hergenrother, 168P}} |
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| ⚫ | |||
[[Category:Periodic comets]] |
[[Category:Periodic comets]] |
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[[Category:Numbered comets|0168]] |
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| ⚫ | |||
[[Category:Split comets]] |
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{{comet-stub}} |
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168P/Hergenrother during its 2012 outburst. By Mount Lemmon Observatory.
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| Discovery | |
|---|---|
| Discovered by | Carl W. Hergenrother |
| Discovery date | November 22, 1998 |
| Designations | |
| P/1998 W2 P/2005 N2 | |
| Orbital characteristics | |
| Epoch | March 6, 2006 |
| Aphelion | 5.839 AU |
| Perihelion | 1.426 AU |
| Semi-major axis | 3.632 AU |
| Eccentricity | 0.6075 |
| Orbital period | 6.923 a |
| Inclination | 21.8934° |
| Last perihelion | August 5, 2019[1][2] October 1, 2012[3] November 2, 2005 |
| Next perihelion | 2026-May-18[1] |
| Earth MOID | 0.4 AU (60 million km) |
168P/Hergenrother is a periodic comet in the Solar System. The comet originally named P/1998 W2 returned in 2005 and got the temporary name P/2005 N2.[4] The comet was last observed in January 2020,[1] and may have continued fragmenting after the 2012 outburst.
The comet came to perihelion on October 1, 2012,[3] and was expected to reach about apparent magnitude 15.2, but due to an outburst the comet reached apparent magnitude 8.[5] As a result of the outburst of gas and dust, the comet was briefly more than 500 times brighter than it would have been without the outburst.[6] On October 19, 2012, images by the Virtual Telescope Project showed a dust cloud trailing the nucleus.[7] Images by the 2 m (79 in) Faulkes Telescope North on October 26, 2012, confirm a fragmentation event.[8] The secondary fragment was about magnitude 17. Further observations by the 8.1 m (320 in) Gemini telescope show that the comet fragmented into at least four parts.[9]
168P came to perihelion on August 5, 2019,[1] when it was 76 degrees from the Sun. It then made a closest approach to Earth on 6 November 6, 2019, when it was 1 AU (150 million km) from Earth with a solar elongation of about 110 degrees. It was not recovered until January 3, 2020, when it was 141 degrees from the Sun, but only two observations on a single night were reported.
![{\displaystyle ({\sqrt[{5}]{100}})^{15.2-8}\approx 758}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b7f0eead17b768506983eda9da2f7d51117084c5)
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