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Comet Machholz
Comet Machholz, formally designated C/2004 Q2, is a long-period comet discovered by Donald Machholz on August 27, 2004.
It reached naked eye brightness in January 2005. Unusual for such a relatively bright comet, its perihelion was farther from the Sun than the Earth's orbit.
== Period ==
Given the orbital eccentricity of this object, different epochs can generate quite different heliocentric unperturbed two-body best-fit solutions to the aphelion distance (maximum distance) of this object. For objects at such high eccentricity, the Suns barycentric coordinates are more stable than heliocentric coordinates. Using JPL Horizons the barycentric orbital elements for epoch 2011-Jan-01 generate a semi-major axis of 537 AU and a period of approximately 12,500 years.〔(【引用サイトリンク】Horizons output ">url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=C/2004+Q2 ) (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0)〕 This gives it a barycentric orbital period just a little larger than Sedna.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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