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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 February 2013,<ref name=MPC/> and may have continued fragmenting after the 2012 outburst. |
'''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 February 2013,<ref name=MPC/> and may have continued fragmenting after the 2012 outburst. |
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== 2012 outburst == |
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The comet came to [[Apsis|perihelion]] on 1 October 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 19 October 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 26 October 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"/> |
The comet came to [[Apsis|perihelion]] on 1 October 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 19 October 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 26 October 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 around August 5, 2019,<ref name=MPC/> when it was expected to be 76 degrees from the Sun. 168P has not yet been recovered and may have disintegrated. During this perihelion passage 168P will make a closest approach to Earth in early November 2019 when it will be {{Convert|1|AU|e6km|abbr=unit|lk=on}} from Earth with a [[solar elongation]] of about 110 degrees. |
168P came to perihelion around August 5, 2019,<ref name=MPC/> when it was expected to be 76 degrees from the Sun. 168P has not yet been recovered and may have disintegrated. During this perihelion passage 168P will make a closest approach to Earth in early November 2019 when it will be {{Convert|1|AU|e6km|abbr=unit|lk=on}} from Earth with a [[solar elongation]] of about 110 degrees. |
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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 | October 1, 2012[1] November 2, 2005 |
| Next perihelion | August 5, 2019[2][3] (Not recovered) |
| 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 February 2013,[2] and may have continued fragmenting after the 2012 outburst.
The comet came to perihelion on 1 October 2012,[1] 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 19 October 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 26 October 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 around August 5, 2019,[2] when it was expected to be 76 degrees from the Sun. 168P has not yet been recovered and may have disintegrated. During this perihelion passage 168P will make a closest approach to Earth in early November 2019 when it will be 1 AU (150 million km) from Earth with a solar elongation of about 110 degrees.
![{\displaystyle ({\sqrt[{5}]{100}})^{15.2-8}\approx 758}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b7f0eead17b768506983eda9da2f7d51117084c5)
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2019 in space
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