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Table 2

Summary of the NACO and VISIR observations.

Date Instrument Mode Length Seeing Transparency

17/06 + 01/08/2010 NACO SM 4 × 1 h 0.8 clear
1718/07/2011 NACO VM 1 n 0.65–0.8 clear
1819/07/2011a NACO VM 0.5 n 0.55–0.65 clear-thin
20/07/2011b VISIR VM 0.5 n 1.0–1.5 thin-thick

Notes. The service mode (SM) or visitor mode (VM) is indicated in Col. 3. The length of the observations is given in hours or in nights in Col. 4. Columns 5 and 6 provide the weather condition: R-band image quality and sky transparency.


a NACO technical problem prevented observation of the star WR102ka.


a significant fraction of the planned observations were not performed owing to the weather.

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