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).

Credit:

ESO

About the Image

Id:eso9521c
Type:Observation
Release date:30 August 1995
Related releases:eso9521
Size:908 x 774 px

About the Object

Name:Comet Hale-Bopp
Type:• Solar System : Interplanetary Body : Comet
• X - Solar System

Image Formats

JPEG grande
175.5 KB
Screensize JPEG
177.5 KB

Wallpapers

1024x768
177.0 KB
1280x1024
262.3 KB
1600x1200
345.3 KB
1920x1200
340.8 KB
2048x1536
493.8 KB

Colours & filters

BandWavelengthTelescope
Optical
R
665 nmESO 1-metre Schmidt telescope

 

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