C/1980 E1
| Discovery | |
|---|---|
| Discovered by | Edward L. G. Bowell |
| Discovery date | 11 February 1980 |
| Alternative designations |
C/1980 E1 |
| Orbital characteristics A | |
| Epoch | JD 2444972.5 (3 January 1982) |
| Perihelion | 3.3639 AU[1] |
| Eccentricity | 1.057[1] (hyperbolic trajectory) 1.053 (epoch 1984+)[2] |
| Orbital period | ~7.1 million years (epoch 1950)[2] Ejection (epoch 1977+)[2] |
| Inclination | 1.6617° |
| Last perihelion | 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 a higher velocity than any other natural object ever observed.
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.[2]
As the comet was approaching perihelion on December 9, 1980, it passed within 0.228 AU of Jupiter,[3] which accelerated the comet briefly giving an (epoch 1981-Jan-09) eccentricity of 1.066.[2] The comet came to perihelion on March 12, 1982,[1] when it had a velocity of 23.3 km/s (52,000 mph) with respect to the Sun. Since the epoch of 1977-Mar-04, C/1980 E1 has had a barycentric eccentricity greater than 1,[2] keeping it on a hyperbolic trajectory that will eject it from the Solar System. Objects in hyperbolic orbits have negative semi major axis, giving them a positive orbital energy. The Minor Planet Center does not directly list a semi-major axis for this comet.[4]
By May 1995, the comet was 30 AU from the Sun on an ejection trajectory going 8.6 km/s (19,000 mph). Since February 2008, the comet has been more than 50 AU from the Sun.[5]
The production of OH (hydroxide) was observed pre-perihelion while the comet was nearly 5 AU from the Sun.[6] CN was not detected until the comet was near perihelion. The comet nucleus was estimated to be have a radius of several kilometers. The surface crust was probably a few meters thick.
See also
- List of Solar System objects by greatest aphelion
- List of hyperbolic comets
- List of non-periodic comets
- List of periodic comets
References
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- Orbital simulation from JPL (Java) / Horizons Ephemeris
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