Seeing-limited

Reconstructed

42''

Two-color wide-field speckle reconstruction

from NESSI

• 0.25'' resolution from 500 frames (20s)
• compromise b/t angres and contrast
• Seeing ~ 0.85''

Urban telescope WF speckle

 Wide-field speckle techniques for small, urban telescopes, Nicole M. Granucci, Elliott P. Horch, Southern Connecticut State Univ. (USA)  talk Tues (coming up next actually)[10701-20]

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M13

• astrometry of clusters
• very early results and little calibration or modelling over the FoV

Reconstructed

Seeing-limited

Abs astrometry residuals

~6-7 mas

4.2 mas

Further improvement possible to obtain ~0.02 pix (~0.4mas)

• optics, dither, deeper obs

0.05 mag accuracy on aperture photometry

FWHM ~7pix (0.57'')

FWHM ~4pix (0.3'')