Listed here are links to quarterly files containing focus model values. The values are given in microns of secondary mirror and represent offsets or excursions from some overall focus state which can be estimated by inspection of the focus history plots. Add the looked up model value to your estimate of the baseline focus state for the best determination of the HST focus at a given time. Zero microns is defined as best focus for the PC in the visible.

The column labeled "full-temp" is the appropriate model to use. The others are obsolete. Ignore the last column labeled "observed".

Year	First Quarter	Second Quarter	Third Quarter	Fourth Quarter
1994 Ephemerides	94.001-090	94.091-180	94.181-270	94.271-365
1995 Ephemerides	95.001-090	95.091-180	95.181-270	95.271-365
1996 Ephemerides	96.001-090	96.091-180	96.181-270	96.271-366
1997 Ephemerides	97.001-090	97.091-180	97.181-270	97.271-365
1998 Ephemerides	98.001-090	98.091-180	98.181-270	98.271-365
1999 Ephemerides	99.001-090	99.091-180	99.181-270	99.271-365
2000 Ephemerides	00.001-090	00.091-180	00.181-270	00.271-366
2001 Ephemerides	01.001-090	01.091-1801	01.181-270	01.271-365
2002 Ephemerides	02.001-090	02.091-180	02.181-271	02.271-365
2003 Ephemerides	03.001-0472

 ¹ Four temperature model data not currently available for Days 2001.121 through 2001.151.

 ² Day 2003.047 is the last day for which temperatures used by the Hershey breathing model will be available through OMS.

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