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C/1999 T1 (McNaught–Hartley)

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For other comets discovered by Robert H. McNaught, see Comet McNaught (disambiguation). Non-periodic comet
C/1999 T1 (McNaught-Hartley)
Discovery
Discovered byRobert H. McNaught
Malcolm Hartley
Discovery siteSiding Spring Observatory
Discovery date7 October 1999
Designations
Alternative designationsComet McNaught-Hartley
Orbital characteristics
Epoch2 December 2000 (JD 2451880.5)
Observation arc787 days (2.15 years)
Number of
observations		661
Aphelion16,247 AU
Perihelion1.172 AU
Semi-major axis8,124 AU
Eccentricity0.99985
Orbital period732,246 years
Inclination79.975°
Longitude of
ascending node		182.483°
Argument of
periapsis		344.758°
Last perihelion13 December 2000
TJupiter0.234
Earth MOID0.19397 AU
Jupiter MOID3.41621 AU
Physical characteristics
Synodic rotation period1–10 days
Comet total
magnitude (M1)		8.3

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.

Observations

Comet McNaught–Hartley was a magnitude 15 object upon discovery on October 7, 1999. Gas emissions were measured in x-ray light by the Chandra observatory (alongside C/1999 S4 (LINEAR)) between 8–14 January 2001. Observations of its coma between January 26 and February 5, 2001 show that the nucleus has a rotation period between 1 and 10 days.

Encounter with the Ulysses probe

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.

See also

References

  1. D. W. Green (11 October 1999). "Comet C/1999 T1 (McNaught–Hartley)". Central Bureau for Astronomical Telegrams. 7273. Bibcode:1999IAUC.7273....1M.
  2. "C/1999 T1 (McNaught–Hartley) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 2 March 2023.
  3. "C/1999 T1 (McNaught-Hartley)". Minor Planet Center. Retrieved 2 March 2023.
  4. ^ S. Yoshida. "C/1999 T1 ( McNaught-Hartley )". www.aerith.net. Retrieved 3 January 2024.
  5. 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.
  6. 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.
  7. 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.
  8. "Ulysses Catches Another Comet by the Tail". ESA. 9 February 2004. Retrieved 2 March 2023.
  9. 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.

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