Telescope: NASA IRTF, Mauna Kea Instrument: MIRSI Date: 2005 July 12 UT Conditions: Scattered cirrus, humidity 21-34%, 1-1.4" seeing, light winds File Object UT Date UT Time Airmass Bandpass Itime Frame Time Mode Start Finish (micron) (sec) (msec) m20050712_0003.fit HR 5340 2005-07-12 05:18:42 05:18:52 1.000 4.9 1.0 100 Chop/Nod m20050712_0004.fit HR 5340 2005-07-12 05:19:40 05:19:50 1.000 4.9 1.0 100 Chop/Nod m20050712_0011.fit HR 5340 2005-07-12 05:28:09 05:28:19 1.001 4.9 1.0 100 Chop/Nod m20050712_0012.fit HR 5340 2005-07-12 05:29:15 05:29:25 1.002 4.9 1.0 100 Chop/Nod m20050712_0013.fit HR 5340 2005-07-12 05:30:03 05:30:13 1.002 4.9 1.0 100 Chop/Nod m20050712_0014.fit HR 5340 2005-07-12 05:31:08 05:31:18 1.002 4.9 1.0 100 Chop/Nod m20050712_0015.fit HR 5340 2005-07-12 05:33:09 05:34:05 1.003 4.9 10.0 150 Chop/Nod m20050712_0016.fit HR 5340 2005-07-12 05:35:39 05:36:39 1.004 8.7 10.0 75 Chop/Nod m20050712_0018.fit HR 5340 2005-07-12 05:41:22 05:42:16 1.006 11.6 10.0 120 Chop/Nod m20050712_0019.fit HR 5340 2005-07-12 05:42:51 05:43:49 1.007 11.6 10.0 90 Chop/Nod m20050712_0021.fit HR 5340 2005-07-12 05:49:08 05:50:06 1.010 18.4 10.0 100 Chop/Nod m20050712_0022.fit HR 5340 2005-07-12 05:51:39 05:52:39 1.011 18.4 10.0 75 Chop/Nod m20050712_0023.fit HR 5340 2005-07-12 05:53:39 05:54:47 1.013 18.4 10.0 48 Chop/Nod m20050712_0024.fit 9P/Tempel 1 2005-07-12 05:59:52 06:00:50 1.239 11.6 10.0 90 Chop/Nod m20050712_0025.fit 9P/Tempel 1 2005-07-12 06:01:45 06:02:43 1.243 11.6 10.0 90 Chop/Nod m20050712_0026.fit 9P/Tempel 1 2005-07-12 06:07:28 06:16:32 1.254 11.6 100.0 90 Chop/Nod m20050712_0027.fit 9P/Tempel 1 2005-07-12 06:19:29 06:29:57 1.280 18.4 100.0 48 Chop/Nod m20050712_0028.fit 9P/Tempel 1 2005-07-12 06:31:47 06:40:27 1.312 4.9 100.0 150 Chop/Nod m20050712_0030.fit 9P/Tempel 1 2005-07-12 06:53:21 07:01:49 1.383 9.8 100.0 120 Chop/Nod m20050712_0031.fit 9P/Tempel 1 2005-07-12 07:04:01 07:13:45 1.426 9.8 100.0 60 Chop/Nod m20050712_0032.fit 9P/Tempel 1 2005-07-12 07:14:54 07:24:38 1.478 12.5 100.0 60 Chop/Nod m20050712_0033.fit 9P/Tempel 1 2005-07-12 07:25:46 07:34:50 1.536 11.6 100.0 90 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 12. (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) 05:13 0.051 05:24 0.046 05:34 0.053 05:43 0.051 05:54 0.058 06:04 0.057 06:13 0.05 06:24 0.058 06:34 0.049 06:43 0.046 06:54 0.056 07:04 0.041 07:13 0.05 07:24 0.048