Motion of Comet Wirtanen near Aphelion

The faint, moving image of the nucleus of Comet Wirtanen (in the circles), as observed by the 8.2-m VLT KUEYEN telescope (formerly UT2) and the VLT Test Camera on May 17, 1999, during the commissioning phase. The telescope followed the comet's motion and the stellar images in the field are therefore seen as trails. Each exposure lasted 8 min through a red (R) filtre. The brightness of the comet is less than R = 25 magnitude, or over 50 million times fainter than what can be seen with the unaided eye. The field of view measures about 17 x 15 arcsec 2. North is up and east is left.

These images were taken on May 17, 1999, between 06:50 and 09:50 UT with the VLT Test Camera at the KUEYEN telescope (VLT UT2) at the Paranal Observatory (Chile). The individual images were bias-subtracted, flat-fielded, cleaned of cosmics (dark pixels caused by cosmic rays impacting on the CCD detector) and normalized. The best twelve images were selected, aligned to the same pixel position and coadded. The observing conditions were variable; the seeing was initially about 0.4 arcsec, but deteriorated somewhat during the observations.

Bildnachweis:

ESO

Über das Bild

ID:eso9932a
Typ:Beobachtung
Veröffentlichungsdatum:29. Juni 1999
Dazugehörige Veröffentlichungen:eso9932
Größe:3000 x 927 px

Über das Objekt

Name:Comet Wirtanen
Typ:Solar System : Interplanetary Body : Comet : Nucleus
Kategorie:Solar System

Bildformate

Großes JPEG
1,5 MB

Bildschirm-Hintergrundbilder

1024x768
465,0 KB
1280x1024
683,5 KB
1600x1200
907,9 KB
1920x1200
1,1 MB
2048x1536
1,2 MB

Farben & Filter

SpektralbereichTeleskop
Optisch
R
Very Large Telescope

Exposure time: 480s