Table 1: Basic properties of comet C/2004 Q2 (Machholz).
Comet C/2004 Q2 (Machholz)
Discovery August 27, 2004
Earth passage $\Delta $ = 0.35 AU on January 5, 2005
Perihelion $r_{\rm h}$ = 1.21 AU on January 25, 2005
Orbital period $\sim$117 000 year
Inclination 38.6$^{\circ}$ with ecliptic
H2O prod. rate $2.6\times 10^{29}$ molec. s-1 at $\Delta $ = 0.394 AU ($\dag $)
Refs.: Horizons On-Line Ephemeris System of JPL.
(NASA) except $\dag $: Bonev et al. (2006).

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