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C/1999 T1 (McNaught-Hartley)

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C/1999 T1 (McNaught-Hartley)
Discovery[1]
Discovered byRobert McNaught, Malcolm Hartley
Discovery siteSiding Spring Observatory
Discovery date7 October 1999
Designations
C/1999 T1, Comet McNaught-Hartley
Orbital characteristics[2][3]
Epoch2451880.5 (2 December 2000)
Number of
observations
704
Aphelion~16,000 AU
Perihelion1.172 AU
Semi-major axis~8,000 AU
Eccentricity0.99985
Orbital period~700,000 yr
Inclination79.975°
182.483°
Argument of
periapsis
344.76°
Last perihelion13 December 2000

C/1999 T1 (McNaught-Hartley) is a near-parabolic long-period comet, discovered by Robert McNaught and Malcolm Hartley at the Siding Spring Observatory in 1999.[1]

Ulysses probe

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Research published in 2004 found that the Ulysses spacecraft had likely detected ions from the comet tail of C/1999 T1. This was the spacecraft's second encounter with a comet tail, after Comet Hyakutake in 1996.[4][5]

See also

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References

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  1. ^ a b "C/1999 T1 ( McNaught-Hartley )". aerith.net. Retrieved 3 January 2024.
  2. ^ "C/1999 T1 (McNaught-Hartley)". JPL. Retrieved 2 March 2023.
  3. ^ "C/1999 T1 (McNaught-Hartley)". Minor Planet Center. Retrieved 2 March 2023.
  4. ^ "Ulysses Catches Another Comet by the Tail". ESA. 9 February 2004. Retrieved 2 March 2023.
  5. ^ Gloeckler, G.; Allegrini, F. (April 2004). "Cometary Ions Trapped in a Coronal Mass Ejection". The Astrophysical Journal. 604 (2): L121–L124. Bibcode:2004ApJ...604L.121G. doi:10.1086/383524.
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