C/1980 E1

C/1980 E1 (Bowell)
Discovery
Discovered by Edward L. G. Bowell
Discovery date February 11, 1980
Alternative
designations		 C/1980 E1
Orbital characteristics A
Epoch February 17, 1982
(JD 2445017.5)
Aphelion N/A
Perihelion 3.3639 AU
Semi-major axis N/A
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 March 12, 1982

C/1980 E1 is a non-periodic comet discovered by Edward L. G. Bowell on February 11, 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 apoapsis distance of 74,600 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] Since the epoch of 1977-Mar-02, 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.

By May 1995, the comet was 30AU 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.[4]

The production of OH was observed pre-perihelion while the comet was nearly 5AU from the Sun.[5] 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.

References and footnotes

  1. ↑ 1.0 1.1 "JPL Small-Body Database Browser: C/1980 E1 (Bowell)". 1986-12-02 last obs. Retrieved 2010-01-08. Check date values in: |date= (help)
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Horizons output. "Barycentric Osculating Orbital Elements for Comet C/1980 E1". Retrieved 2011-03-09. (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0)
  3. ↑ "JPL Close-Approach Data: C/1980 E1 (Bowell)". 1986-12-02 last obs. Retrieved 2010-03-23. Check date values in: |date= (help)
  4. ↑ Yeomans, Donald K.; Chamberlin, Alan B. "Horizons Ephemeris". JPL Solar System Dynamics. Retrieved 2011-02-22.
  5. ↑ Ahearn, Michael F.; Schleicher, D. G.; Millis, R. L.; Feldman, P. D.; Thompson, D. T. (1984). "Comet Bowell 1980b". Astronomical Journal 89: 579–591. Bibcode:1984AJ.....89..579A. doi:10.1086/113552.

External links