Telescope:  NASA IRTF, Mauna Kea
Instrument:  SpeX (Imager)
Date:  2005 July 02 UT

Conditions:  No clouds, humidity 15-17%, 0.4-0.7" seeing, light winds


      File                    Object        UT Date           UT Time         Airmass   Filter    Itime  Coadds  PosAngle   Slit
                                                         Start      Finish                        (sec)           (deg)

g20050702_0001_a.fit        9P/Tempel 1    2005-07-02   06:53:40   06:54:56    1.265      H       30.00      2     0.00    0.5x15
g20050702_0002_a.fit        9P/Tempel 1    2005-07-02   06:55:15   06:56:31    1.270      H       30.00      2     0.00    0.5x15

Optical depth at 225 GHz measured at the Caltech Submillimeter Observatory (CSO) on Mauna Kea
as function of time (UT) on 2005 Jul 02.  (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)  
  06:43  0.099   
  06:54  0.096   
  07:04  0.105