| 词条 | 60558 Echeclus |
| 释义 |
| minorplanet=yes | background=#C7FF8F | name=60558 Echeclus 174P/Echeclus | discoverer=Spacewatch | discovered=3 March 2000 | discovery_site=Kitt Peak Obs. | mpc_name=(60558) Echeclus | alt_names={{mp|2000 EC|98}}, {{mp|2002 GJ|27}} | pronounced={{IPAc-en|ɪ|ˈ|k|ɛ|k|l|ə|s}} {{respell|i|KEK|ləs}} or {{IPAc-en|ˈ|ɛ|k|ɪ|k|l|ə|s}} {{respell|EK|i|kləs}} | mp_category=Centaur | orbit_ref=[1] | epoch=13 January 2016 (JD 2457400.5) | uncertainty=0 | semimajor={{Convert|10.680|AU|Tm|abbr=on}} | perihelion={{Convert|5.8168|AU|Gm|abbr=on}} | aphelion={{Convert|15.544|AU|Tm|abbr=on|lk=on}} | eccentricity=0.45537 | period=34.90 yr (12749 d) | inclination=4.3445° | asc_node=173.335° | arg_peri=162.889° | mean_anomaly=7.51102° | avg_speed=8.58 km/s | p_mean_motion=0.0282 | mean_motion={{Deg2DMS|0.028238|sup=ms}} / day | observation_arc=13264 days (36.31 yr) | jupiter_moid={{Convert|0.838867|AU|Gm|abbr=on}} | tisserand=3.031 | dimensions=84 km[1][2] | mass= | density= | surface_grav= | escape_velocity= | rotation={{Convert|26.802|h|d|abbr=on|lk=on}}[3] | spectral_type= | magnitude=~18.8[4] | abs_magnitude=9.6[3] | albedo=0.04[2] | single_temperature=~85 K }}60558 Echeclus is a centaur in the outer Solar System. It was discovered by Spacewatch in 2000 and initially classified as a minor planet with provisional designation {{mp|2000 EC|98}} (also written 2000 EC98). Research in 2001 by Rousselot and Petit at the Besançon observatory in France indicated that it was not a comet, but in late December 2005 a cometary coma was detected. In early 2006[5] the Committee on Small Bodies Nomenclature (CSBN) gave it the cometary designation 174P/Echeclus. It last came to perihelion in April 2015,[3] and was expected to reach about apparent magnitude 16.7 near opposition in September 2015. NameEcheclus is a centaur in Greek mythology. 60558 Echeclus is only the second comet (after Chiron) that was named as a minor planet, rather than after the name of its discoverer. Chiron is also a centaur; other centaurs are being observed for signs of a cometary coma. Besides Echeclus, seven other objects are cross-listed as both comets and numbered minor planets: 2060 Chiron (95P/Chiron), 4015 Wilson–Harrington (107P/Wilson–Harrington), 7968 Elst–Pizarro (133P/Elst–Pizarro), 118401 LINEAR (176P/LINEAR), {{mpl|323137|2003 BM|80}} (282P/2003 BM80), {{mpl|300163|2006 VW|139}} (288P/2006 VW139), and {{mpl|457175|2008 GO|98}} (362P/2008 GO98).[6] ChunkOn 30 December 2005, when 13.1 AU from the Sun, a large chunk of Echeclus was observed to break off, causing a great cloud of dust. Astronomers have speculated this could have been caused by an impact or by an explosive release of volatile substances.[7] OutburstsEcheclus appears to have outburst again around June 2011 when it was 8.5 AU from the Sun.[13][14] On 24 June 2011, follow up imaging with the 2 meter Haleakala-Faulkes Telescope South showed the coma of Echeclus to be very close to the sky background limit.[15] Echeclus outburst again around 7 December 2017 when it was 7.3 AU from the Sun, and was 4 magnitudes brighter than expected.[8] Presence of gasIn 2016, carbon monoxide was detected in Echeclus in very small amounts, and the derived CO production rate was calculated to be sufficient to account for the observed coma. The calculated CO production rate from Echeclus is substantially lower than what is typically observed for 29P/Schwassmann–Wachmann, another distantly active comet often classified as a centaur.[9] OrbitEcheclus came to perihelion in April 2015.[3] Centaurs have short dynamical lives due to strong interactions with the giant planets. Echeclus is estimated to have an orbital half-life of about 610,000 years.[10] See also
References1. ^{{cite web |date=22 August 2008 |title=List of Known Trans-Neptunian Objects |publisher=Johnston's Archive |author=Wm. Robert Johnston |url=http://www.johnstonsarchive.net/astro/tnoslist.html |accessdate=2006-12-26| archiveurl= https://web.archive.org/web/20061216155220/http://johnstonsarchive.net/astro/tnoslist.html| archivedate= 16 December 2006 | deadurl= no}} (0174P)[11][12][13]2. ^1 {{cite arXiv |title=Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope |author=John Stansberry |author2=Will Grundy |author3=Mike Brown |author4=Dale Cruikshank |author5=John Spencer |author6=David Trilling |author7=Jean-Luc Margot |eprint=astro-ph/0702538 |date=2007}} 3. ^1 2 3 4 {{cite sbdb |title=60558 Echeclus (2000 EC98) |id=2060558 |accessdate=12 April 2016}} 4. ^{{cite web |title=AstDys (60558) Echeclus Ephemerides |publisher=Department of Mathematics, University of Pisa, Italy |url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=60558 |accessdate=2010-06-28}} 5. ^{{cite web| url=http://www.fg-kometen.de/fgk_hpe.htm| title=Homepage of the VdS-Fachgruppe Kometen| accessdate=2006-04-18| archiveurl=https://web.archive.org/web/20060424060815/http://www.fg-kometen.de/fgk_hpe.htm| archivedate=24 April 2006| deadurl=yes| df=}} 6. ^Dual-Status Objects 7. ^{{cite web| url=https://www.newscientist.com/article/dn8976-hybrid-cometasteroid-in-mysterious-breakup.html| title=Hybrid comet-asteroid in mysterious break-up| first=Jeff| last=Hecht| date=11 April 2006| publisher=NewScientist.com news service| accessdate=2006-04-18}} 8. ^[https://groups.yahoo.com/neo/groups/mpml/conversations/messages/33519 33519 174P/Echeclus outburst (Brian Skiff)] 9. ^{{cite journal |last=Wierzchos |first= K. |author2=Womack, M. |author3=Sarid, G. |title=Carbon Monoxide in the Distantly Active Centaur (60558) 174P/Echeclus at 6 au |date=2017 |doi=10.3847/1538-3881/aa689c |journal=The Astronomical Journal |volume=153 |issue=5 |pages=8 |bibcode = 2017AJ....153..230W |arxiv = 1703.07660 }} 10. ^{{cite journal |last=Horner |first= J. |author2=Evans, N.W. |author3=Bailey, M. E. |title=Simulations of the Population of Centaurs I: The Bulk Statistics |date=2004 |doi=10.1111/j.1365-2966.2004.08240.x |journal=Monthly Notices of the Royal Astronomical Society |volume=354 |issue=3 |pages=798 |arxiv=astro-ph/0407400|bibcode = 2004MNRAS.354..798H }} 11. ^1 {{cite web |date=June 1, 2011 |title=Outburst of 174P/Echeclus |publisher=Team of observers of Remanzacco Observatory in Italy |author=Giovanni Sostero |author2=Ernesto Guido |last-author-amp=yes |url=http://remanzacco.blogspot.com/2011/06/outburst-of-174pecheclus.html |accessdate=2011-06-01}} 12. ^1 {{cite web |date=June 9, 2011 |title=Follow-up of 174P/Echeclus bright phase |publisher=Team of observers of Remanzacco Observatory in Italy |author=Giovanni Sostero |author2=Ernesto Guido |last-author-amp=yes |url=http://remanzacco.blogspot.com/2011/06/follow-up-of-174pecheclus-bright-phase.html |accessdate=2011-06-09}} 13. ^1 {{cite web |date=June 24, 2011 |title=Further follow-up of 174P/Echeclus |publisher=Team of observers of Remanzacco Observatory in Italy |author=Nick Howes |author2=Giovanni Sostero |author3=Ernesto Guido |last-author-amp=yes |url=http://remanzacco.blogspot.com/2011/06/further-follow-up-of-174pecheclus.html |accessdate=2011-06-24}} }} External links
6 : Centaurs (minor planets)|Periodic comets|Discoveries by the Spacewatch project|Minor planets named from Greek mythology|Named minor planets|Astronomical objects discovered in 2000 |
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