HST Secondary Mirror Moves:
This table gives the dates, times, and movement in microns of the HST secondary mirror.
The convention here is that a positive motion of the secondary is a movement along the V1
axis away from the primary mirror.
One micron of secondary mirror defocus translates to 110 microns at the focal plane.
The focus zero point is currently defined as WFPC2 PC best focus as determined by PSF-fitting
(phase retrieval) software for PSFs in the ~400-800 nm range.
| Day of Year |
Time (UT) |
Secondary Move |
| 29 Jun 1994 |
17:36 UT |
+5.0 |
| 15 Jan 1995 |
23:40 UT |
+5.0 |
| 28 Aug 1995 |
15:16 UT |
+6.5 |
| 14 Mar 1996 |
18:47 UT |
+6.0 |
| 30 Oct 1996 |
17:40 UT |
+5.0 |
| 18 Mar 1997 |
22:55 UT |
-2.4 |
12 Jan 1998
(NIC3 campaign 1) |
01:15 UT |
+21.0 |
| 01 Feb 1998 |
16:40 UT |
-18.6 |
04 Jun 1998
(NIC3 campaign 2) |
01:01 UT |
+16.6 |
| 28 Jun 1998 |
17:26 UT |
-15.2 |
| 15 Sep 1999 |
15:40 UT |
+3.0 |
| 09 Jan 2000 |
17:42 UT |
+4.2 |
| 15 Jun 2000 |
19:38 UT |
+3.6 |
| 02 Dec 2002 |
20:50 UT |
+3.6 |
| 22 Dec 2004 |
23:12 UT |
+4.16 |
| 31 Jul 2006 |
14:35 UT |
+5.34 |
Also available is a plot of the Measured PC Focus History annotated with the secondary mirror moves.
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