Telescope:  NASA IRTF, Mauna Kea
Instrument:  MIRSI
Date:  2005 July 17 UT

Conditions:   No clouds, humidity 15-56%, 0.8-1.2" seeing, winds E 8-29 mph


      File                    Object         UT  Date          UT Time         Airmass   Bandpass   Itime   Frame Time    Mode
                                                          Start      Finish              (micron)   (sec)     (msec)

m20050717_0004.fit           HR 5340        2005-07-17   08:14:36   08:14:56    1.458       8.7      1.0        60       Chop/Nod
m20050717_0009.fit           HR 5340        2005-07-17   08:21:01   08:21:21    1.500      11.6      1.0        60       Chop/Nod
m20050717_0011.fit           HR 5340        2005-07-17   08:22:45   08:23:07    1.512      18.4      1.0        24       Chop/Nod
m20050717_0012.fit           HR 5340        2005-07-17   08:23:20   08:23:42    1.516      18.4      1.0        24       Chop/Nod

m20050717_0013.fit           9P/Tempel 1    2005-07-17   08:29:02   08:32:06    2.348      11.6     20.0        60       Chop/Nod
m20050717_0017.fit           9P/Tempel 1    2005-07-17   08:43:57   08:48:25    2.658      10.4     20.0        20       Chop/Nod
m20050717_0018.fit           9P/Tempel 1    2005-07-17   08:49:02   08:53:30    2.787      10.4     20.0        20       Chop/Nod

m20050717_0023.fit           HR 5340        2005-07-17   09:08:36   09:08:56    1.954      11.6      1.0        60       Chop/Nod
m20050717_0024.fit           HR 5340        2005-07-17   09:09:17   09:09:37    1.963      11.6      1.0        60       Chop/Nod
m20050717_0025.fit           HR 5340        2005-07-17   09:10:44   09:11:14    1.983      10.4      1.0        12       Chop/Nod
m20050717_0026.fit           HR 5340        2005-07-17   09:11:29   09:11:59    1.993      10.4      1.0        12       Chop/Nod

Optical depth at 225 GHz measured at the Caltech Submillimeter Observatory (CSO) on Mauna Kea
as function of time (UT) on 2005 July 17.  (Precipitable water vapor above the summit of Mauna Kea
can be approximated by pwv (mm) ~ 20 * Tau (225 GHz), ie: for Tau (225 GHz) ~ 0.10, pwv ~ 2 mm).

                UT      Tau (225 GHz)
                08:04   0.098 
                08:13   0.098 
                08:24   0.093 
                08:34   0.095 
                08:43   0.103 
                08:54   0.093 
                09:04   0.094 
                09:13   0.088 
                09:24   0.1