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

Over de afbeelding

Id:eso9521c
Type:Observatie
Publicatiedatum:30 augustus 1995
Gerelateerde berichten:eso9521
Grootte:908 x 774 px

Over het object

Naam:Comet Hale-Bopp
Type:Solar System : Interplanetary Body : Comet
Categorie:Solar System

Afbeeldingstypen

Grote JPEG
176,3 KB

Achtergrond

1024x768
177,7 KB
1280x1024
263,0 KB
1600x1200
346,0 KB
1920x1200
341,6 KB
2048x1536
494,6 KB

Kleuren & filters

BandGolflengteTelescoop
Optisch
R
665 nmESO 1-metre Schmidt telescope