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

Z. Y. Lin, M. Weiler, H. Rauer, W. H. Ip

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


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 NH2. 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.

Original languageEnglish
Pages (from-to)771-776
Number of pages6
JournalAstronomy and Astrophysics
Issue number2
StatePublished - Jul 2007


  • Comets: indvidual: C/2004Q2 (Machholz)


Dive into the research topics of 'Photometry and imaging of comet C/2004 Q2 (Machholz) at Lulin and la Silla'. Together they form a unique fingerprint.

Cite this