|Date:||27.3.1996||Time:||02:56 UT||Exposure:||3 x 120s|
|Field of View:||41o x 7o||Receiver:||20482 CCD||Filter:||Schott RG645|
|Instrument:||f=100mm, 1/2.8||Observatory:||Hoher List||Observer:||T. Credner|
© Copyright by the observers
Astronomical Institutes of the University of Bonn
A mosaic of three exposures is shown, which provides an Ion-tail with 41 degrees length. For a real flat sky and a higher contrast an unsharp mask was subtracted. Thats the reason for the dark parts at the comets head.
But these obvious parallel bands, starting at the end of the dust-tail, are also in the original frame. It is not really sure yet, if this is just CCD-fringing, clouds or any other non-astronomical effect. This could be the so called striae, synchronic bands that were also reported for comet West 1976 VI and comet Mrkos 1957 V on wide-field images.
If you made or just have seen equivalent images of Hyakutake, please contact me ( firstname.lastname@example.org). Especially wide-field observations of this time are object of interest.
DWARF (Deep sensing Wide Angle Recording
For the purpose of widefield imaging of cometary tail structures, a nitrogen cooled CCD-Camera with 2048 x 2048 Pixels was used. It was developed and buildt by the CCD-Group of the Astronomische Institute Bonn (Klaus Reif: Vier Millionen Bildelemente, SuW 31, 300 [3/1992]). Sometimes used for the 1.23m-telescope at Calar Alto, now the imaging optics was a small f=100mm f/2.0 Zeiss Planar camera lens. With this optics and the 3 x 3 cm2 sized chip a large field of 17 x 17 degree2 can be covered. See also the DWARF page.