C/1999 T1 (McNaught–Hartley)

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C/1999 T1 (McNaught-Hartley)
Discovery
Discovered byRobert H. McNaught
Malcolm Hartley
Discovery siteSiding Spring Observatory
Discovery date7 October 1999
Designations
Comet 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°
182.483°
Argument of
periapsis		344.758°
Last perihelion13 December 2000
TJupiter0.234
Earth MOID0.19397 AU
Jupiter MOID3.41621 AU
Physical characteristics
1–10 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.

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