Photometry and imaging of comet C/2004 Q2 (Machholz) at Lulin and La Silla

Details Photometry and imaging of comet C/2004 Q2 (Machholz) at Lulin and La Silla Photometry and imaging of comet C/2004 Q2 (Machholz) at Lulin and La Silla

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...469..771l&link_type=abstract

Astronomy and Astrophysics, Volume 469, Issue 2, July II 2007, pp.771-776

Astronomy and Astrophysics

Astrophysics

10

Comets: Indvidual: C/2004Q2 (Machholz)

Scientific paper

Aims:We have investigated the development of the dust and gas coma of the comet C/2004 Q2 (Machholz) from December 2004 to January 2005 using observations obtained at the Lulin Observatory, Taiwan and the European Southern Observatory at La Silla, Chile. Methods: We determined the dust-activity parameter Afρ and the dust color and derived Haser production rates and scale lengths of C2 and NH_2. An image enhancement technique was applied to study the morphology of the gas and dust coma. Results: Two jets were observed in the coma distributions of C2 and CN of comet Machholz that were not formed in the dust coma. The jets showed a spiral-like structure and pointed at different position angles at different observing times. The formation of these jets can be explained by the presence of two active surface regions on a rotating cometary nucleus.

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