CFHT, Instruments, Imaging, AOB, Second Engineering Run Images

PUEO's second engineering run images

The second engineering run took place from Mai 3rd to Mai 8th, 1996. Highlights from this run are some crispy images in the visible region. Here are a sample of the results.

Click on the images to get an enlarged version.

This is an image of the center of the globular cluster M71 at I band (830 nm). FWHM is 0.10 arcsec (center) to 0.18 arcsec (edges). The natural seeing was 0.30 arcsec (excluding tracking errors and telescope fixed aberrations). This is a 1200 seconds exposure.

Same field in the V band (545 nm). FWHM is 0.12 arcsec (center) to 0.21 arcsec (edges). The natural seeing was 0.28 arcsec (excluding tracking errors and telescope fixed aberrations). This is also a 1200 seconds exposure.

Image of a 8.6 R magnitude star in the I band. The FWHM is 0.068 arcsec. To our knowledge, this is the crispiest long exposure image ever from ground based observations. The Strehl ratio is 13\%. Integration time is 2 seconds, which is kinda short but is sufficient to get a meaninful average in close-loop. D/r0 is 9.4 at 0.5 microns.

Created 1 April 1996.
Page maintained by Jean-Luc Beuzit.
Please send comments to : beuzit@cfht.hawaii.edu