Comet Hale-Bopp

This image was produced through successive use of photographic enhancement and subtraction, followed by smoothing by computer processing . When a matching, earlier exposure of the same sky field with the same telescope (on which the comet is not present) is photographically subtracted from the enhanced photo of the same field in which the comet is present, then the images of the stars should in principle cancel out, leaving only that of the comet in the field. A full cancellation is virtually impossible to achieve in practice, but if the resulting image is heavily smoothed (i.e. substituting each image element with the mean intensity of its surroundings), then the smaller images of the stars disappear and the full extent of the comet's large coma becomes visible. This false-colour photo was produced in this way by means of computer processing within the MIDAS image processing system. The images of the brightest stars could not be completely removed by this process and faint remnants are still present. (In technical terms, a 2-D low-pass Fourier filter was used to achieve heavy smoothing over approx. 16 x 16 arcsec cells).

Oikeudet:

ESO

Kuvasta

Tunnistus:eso9521c
Tyyppi:Havainto
Julkaisupäivä:30. elokuuta 1995
Vastaavat julkaisut:eso9521
Koko:908 x 774 px

Kohteesta

Nimi:Comet Hale-Bopp
Tyyppi:Solar System : Interplanetary Body : Comet
Kategoria:Solar System

Kuvaformaatit

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176,3 KB
Kokoruudun JPEG
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Värit ja suotimet

KaistaAallonpituusTeleskooppi
Optinen
R
665 nmESO 1-metre Schmidt telescope