SURFACE PHOTOMETRY OF COMET HALE–BOPP CARBON IMAGES


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Abstract

A very long series of photographic observations of the comet Hale–Bopp has been made during January–April 1997 at the double astrograph (400/2000)) of the Main Astronomical Observatory (Kyiv, Ukraine)). Some of the cometary photos were obtained with two wide-band filter combinations. One of these combinations isolates C2emission, another – the nearby dust continuum. The images were digitized by means of AMDPH-XY machine and then calibrated following the standard procedure. After subtraction of the dust continuum the distribution of surface brightness in the C2emission coma of comet Hale–Bopp was studied. We found an asymmetric brightness distribution both pre- and post-perihelion. On 21.77 April 1997 a secondary brightness peak is found at the distance of 1.03 × 105km from the nucleus. It is possible that this peak is related to the extended source of the C2molecules.

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