| 词条 | C/1980 E1 (Bowell) |
| 释义 |
| name=C/1980 E1 (Bowell) | discoverer=Edward L. G. Bowell | image=C1980 E1-orbit.png | caption=Hyperbolic path with annual motion | discovery_date=11 February 1980 | designations=C/1980 E1 | orbit_ref=[1] | epoch=JD 2444972.5 (3 January 1982) | perihelion=3.3639 AU[1] | eccentricity=1.057[1] (hyperbolic trajectory) 1.053 (epoch 1984+)[4] | period=~7.1 million years (epoch 1950)[4] Ejection (epoch 1977+)[4] | inclination=1.6617° | asc_node=114.558° | arg_peri=135.083° | mean_anomaly=−0.1513° | last_p=12 March 1982[1] }}C/1980 E1 is a non-periodic comet discovered by Edward L. G. Bowell on 11 February 1980. C/1980 E1 is leaving the Solar System on a hyperbolic trajectory with only 1I/ʻOumuamua being on a faster hyperbolic trajectory.[1] Before entering the inner Solar System for a 1982 perihelion passage, C/1980 E1 had a barycentric (epoch 1950-Jan-01) orbit with an aphelion of 74,300 AU (1.17 light-years), and a period of approximately 7.1 million years.[4] As the comet was approaching perihelion on December 9, 1980, it passed within 0.228 AU of Jupiter,[10] which accelerated the comet briefly giving an (epoch 1981-Jan-09) eccentricity of 1.066.[4] The comet came to perihelion on March 12, 1982,[1] when it had a velocity of {{convert|23.3|km/s|mph|abbr=on}} with respect to the Sun. Since the epoch of 1977-Mar-04, C/1980 E1 has had a barycentric eccentricity greater than 1,[4] keeping it on a hyperbolic trajectory that will eject it from the Solar System. Objects in hyperbolic orbits have a negative semimajor axis, giving them a positive orbital energy. The Minor Planet Center does not directly list a semimajor axis for this comet.[14] By May 1995, the comet was 30 AU from the Sun on an ejection trajectory going {{convert|8.6|km/s|mph|abbr=on}}. Since February 2008, the comet has been more than 50 AU from the Sun.[15] The production of OH (hydroxide) was observed pre-perihelion while the comet was nearly 5 AU from the Sun. CN (cyanide) was not detected until the comet was near perihelion. The comet nucleus was estimated to have a radius of several kilometers. The surface crust was probably a few meters thick. See also
References1. ^{{cite journal |last1=de la Fuente Marcos |first1=Carlos |last2=de la Fuente Marcos |first2=Raúl |title=Pole, Pericenter, and Nodes of the Interstellar Minor Body A/2017 U1 |journal=Research Notes of the AAS |date=1 November 2017 |volume=1 |issue=1 |arxiv=1711.00445 |doi=10.3847/2515-5172/aa96b4 |pages=9 (2 pages) |url=http://iopscience.iop.org/article/10.3847/2515-5172/aa96b4 |bibcode = 2017RNAAS...1a...5D }} [2][3][4][5][6]2. ^1 2 3 4 5 {{cite web |type=last observation: 1986-12-30 |title=JPL Small-Body Database Browser: C/1980 E1 (Bowell) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1980E1 |accessdate=2015-09-26}} 3. ^1 2 3 4 5 6 {{cite web |author=Horizons output |url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=C/1980+E1 |title=Barycentric Osculating Orbital Elements for Comet C/1980 E1 |accessdate=2011-03-09}} (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0) 4. ^1 {{cite web |type=last observation: 1986-12-30 |title=JPL Close-Approach Data: C/1980 E1 (Bowell) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1980E1;cad=1#cad |accessdate=2015-09-26}} 5. ^1 {{cite web |title=Horizons Ephemeris |publisher=JPL Solar System Dynamics |author1=Yeomans, Donald K. |author2=Chamberlin, Alan B |url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=1980E1 |accessdate=2011-02-22}} 6. ^1 {{cite web |title=C/1980 E1 (Bowell) Orbit at the Minor Planet Center |url=http://www.minorplanetcenter.net/db_search/show_object?object_id=C%2F1980+E1 |accessdate=2015-09-28}} }} External links
3 : Non-periodic comets|Hyperbolic comets|Astronomical objects discovered in 1980 |
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