C/1999 T1 (McNaught–Hartley) is a near-parabolic long-period comet, discovered by Robert H. McNaught and Malcolm Hartley at the Siding Spring Observatory in 1999.[4]
| Discovery[1] | |
|---|---|
| Discovered by | Robert H. McNaught Malcolm Hartley |
| Discovery site | Siding Spring Observatory |
| Discovery date | 7 October 1999 |
| Designations | |
| Comet McNaught-Hartley | |
| Orbital characteristics[2][3] | |
| Epoch | 2 December 2000 (JD 2451880.5) |
| Observation arc | 787 days (2.15 years) |
| Number of observations | 661 |
| Aphelion | 16,247 AU |
| Perihelion | 1.172 AU |
| Semi-major axis | 8,124 AU |
| Eccentricity | 0.99985 |
| Orbital period | 732,246 years |
| Inclination | 79.975° |
| 182.483° | |
| Argument of periapsis | 344.758° |
| Last perihelion | 13 December 2000 |
| TJupiter | 0.234 |
| Earth MOID | 0.19397 AU |
| Jupiter MOID | 3.41621 AU |
| Physical characteristics | |
| 1–10 days | |
| Comet total magnitude (M1) | 8.3 |
Observations
editComet McNaught–Hartley was a magnitude 15 object upon discovery on October 7, 1999.[4] Gas emissions were measured in x-ray light by the Chandra observatory (alongside C/1999 S4 (LINEAR)) between 8–14 January 2001.[5][6] Observations of its coma between January 26 and February 5, 2001 show that the nucleus has a rotation period between 1 and 10 days.[7]
Encounter with the Ulysses probe
editResearch 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.[8][9]
See also
editReferences
edit- ^ D. W. Green (11 October 1999). "Comet C/1999 T1 (McNaught–Hartley)". Central Bureau for Astronomical Telegrams. 7273. Bibcode:1999IAUC.7273....1M.
- ^ "C/1999 T1 (McNaught–Hartley) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 2 March 2023.
- ^ "C/1999 T1 (McNaught-Hartley)". Minor Planet Center. Retrieved 2 March 2023.
- ^ a b S. Yoshida. "C/1999 T1 ( McNaught-Hartley )". www.aerith.net. Retrieved 3 January 2024.
- ^ V. A. Krasnopolsky; D. J. Christian; V. Kharchenko; A. Dalgarno; S. J. Wolk; et al. (December 2002). "X-Ray Emission from Comet McNaught-Hartley (C/1999 T1)". Icarus. 160 (2): 437–447. Bibcode:2002Icar..160..437K. doi:10.1006/icar.2002.6965.
- ^ V. A. Krasnopolsky (February 2004). "Comparison of X-rays from Comets LINEAR (C/1999 S4) and McNaught-Hartley (C/1999 T1)". Icarus. 167 (2): 417–423. Bibcode:2004Icar..167..417K. doi:10.1016/j.icarus.2003.10.006.
- ^ L. M. Lara; J. Licandro; G. P. Tozzi (April 2009). "Structures in the dust coma of comet C/1999 T1 (McNaught-Hartley) from Jan. 26 to Feb. 05, 2001" (PDF). Astronomy and Astrophysics. 497 (3): 843–846. Bibcode:2009A&A...497..843L. doi:10.1051/0004-6361/200810194.
- ^ "Ulysses Catches Another Comet by the Tail". ESA. 9 February 2004. Retrieved 2 March 2023.
- ^ G. Gloeckler; F. Allegrini (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.
External links
edit- C/1999 T1 at the JPL Small-Body Database
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