Multicolor Imaging of C/2006 M4 (SWAN)

Abstract

C/2006 M4 (SWAN) became 2 magnitude brighter than the prediction that with magnitude of about 6 during from October end to November beginning. We took the comet images on 5 bands (B, V, Rc, Ic, and No filter) that used by cooled CCD camera (SBIG STL-1001E) by direct focus of 15cm refracting telescope (f.l.1800mm) in Himeji City "Hoshinoko Yakata". From comparison of each images, the usually blue ion tail included red light by probably H₂O⁺ ion tail. From comparison of images and the calculation by Beseel-Bredichin theory, the dust tail made by dust particles that was released in those days of the perihelion passage.