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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]
| Discovery[1] | |
|---|---|
| Discovered by | Robert McNaught, Malcolm Hartley |
| Discovery site | Siding Spring Observatory |
| Discovery date | 7 October 1999 |
| Designations | |
| C/1999 T1, Comet McNaught-Hartley | |
| Orbital characteristics[2][3] | |
| Epoch | 2451880.5 (2 December 2000) |
| Number of observations | 704 |
| Aphelion | ~16,000 AU |
| Perihelion | 1.172 AU |
| Semi-major axis | ~8,000 AU |
| Eccentricity | 0.99985 |
| Orbital period | ~700,000 yr |
| Inclination | 79.975° |
| 182.483° | |
| Argument of periapsis | 344.76° |
| Last perihelion | 13 December 2000 |
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]
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