Subject: 3.5m Throughput Measurements

From: Alan Watson

Submitted: Mon, 3 Feb 1997 16:52:29 -0700

Message number: 122 (previous: 121, next: 123 up: Index)

We have just finished our analysis of the data we took during the
second half of Thursday night. The full text is available from:

    ftp://oldp.nmsu.edu/pub/alan/apo/970203.ps.Z
    
The abstract is:

    We have measured the throughputs of the APO 3.5m after the recent
    realuminization of the primary, secondary, and tertiary mirrors.
    We used DIS and GRIM~II to make measurements from 3500\AA\ to 2.5
    micron. The throughout has increased at all wavelengths and the
    improvement is most spectacular in the blue. At 4000\AA\ the
    improvement is a factor of 3.7, at 4800\AA\ a factor of 2.7, at
    6000\AA\ a factor of 2.1, and between 8000\AA\ and 1.6 micron a
    factor of 1.4, and at 2 micron a factor of 1.3. Other than the
    known UV problem with DIS, the throughput of the telescope and
    instruments appears to be excellent. The telescope mirror
    reflectivities are estimated to be about 0.93 in the blue, 0.86 in
    the red, and 0.95 in the near infrared.

This is good news.

Regards,

Mike Ledlow & Alan Watson
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