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Calanca/Facchini Images of Comet Hale-Bopp

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Observers: Rodolfo Calcanca, M. Facchini
Location: Osservatorio Astronomico di Cavezzo, Italy
Date: February 7, 1997 05:15 UT

First Image

The sum of 16 images of 15 seconds of integration time of the Hale Bopp comet has been realized on the 7th february 1997 at 5h 15m UT in the Astronomical Observatory of Cavezzo, with the 40 cm telescope and the CCD camera 512x512, field: 12'x12'. The image has been treated with the Larson Sekanina radial algorithm; -2 pixels (the North is up, East on the left). The gas shells which surround the nucleus, are clearly visible. These structures look exactly like those seen in the Hyakutake comet in the CCD images in march last year. Digital processing: M. Facchini.

Second Image

The elaboration of an image of the Hale Bopp comet has been realized on the 7th february 1997 at 5h 15m UT in the Astronomical Observatory of Cavezzo, with the 40 cm telescope and the CCD camera 512x512. The digital processing consists in a transformation off coordinates from rectangular into polar. The wavy shells of the tail are clearly visible in the rectangular square on the left of the image. Digital processing: M. Facchini.

Third Image

The sum of 16 images of 15 seconds of integration time of the Hale Bopp comet has been realized on the 7th february 1997 at 5h 15m UT in the Astronomical Observatory of Cavezzo, with the 40 cm telescope and the CCD camera 512x512, field: 12'x12'. The image has been treated with the Larson Sekanina rotational algorithm; 12 degrees (the North is up, East on the left). It is possible to see the gas shells in this image too. The anti-tail bends slightly with an position angle of 180 degrees. Digital processing: M. Facchini.
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