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From: starrfie@hydro.la.asu.edu (Sumner Starrfield) Subject: WF/PC is Dead! Long live WFPC! (fwd) Date: Tue, 7 Dec 93 9:52:20 MST To: nova@nova.la.asu.edu (nova list) Forwarded message: >From JJH@wfpc.la.asu.edu Tue Dec 7 08:08:54 1993 Date: Tue, 7 Dec 1993 8:15:29 -0700 (MST) From: JJH@wfpc.la.asu.edu To: astro@bigbang.la.asu.edu Message-ID: <vsnet-history1861@hoge.baba.hajime.jp> Subject: WF/PC is Dead! Long live WFPC! Dear All: The installation of the WFPC-2 last night was a total and unqualified success. The exciting stuff you probably saw on TV. It's a crime to use as mundane a word as "nominal" to describe the removal of the WF/PC-I and installation WFPC-2 by astronauts Story Musgrave and Jeff Hoffman. Shortly after the WFPC-2 was installed, an aliveness test was run to test instrument power, telemetry, and the microprocessor. No anomolies were observed. As the astronauts were finishing up their EVA, we conducted a functional test that consisted of a bias frame, K-spots, and an internal calibration exposure. The data were written onto the HST tape recorder, and downloaded to ground at approximately 6:30 AM EST. Comparison with data taken during thermal vacuum testing shows very little difference. For the cognacenti, K-spot shifts relative to data taken during TV with warm CCDs were 5.4 pixels in PC1, 1.0 pixels in WF2, 0.0 pixels in WF3, and 1.9 pixels in WF4. All shifts are in the direction consistent with gravity release. The change in pupil shear implied by the shifts is well within the range of the camera's actuated optics, so there are no worries about our ability to align the instrument. All wheels in the SOFA (Selectable Optical Filter Assembly) were successfully rotated and homed. Folk here at Goddard and from what we heard in the OSS at the STScI are walking around about three feet above the ground. Now for the fun part, which is scheduled to start around the 17th with acquisition of the first "aperture location" images and the start of the process of alignment and focus. Also accomplished last night was installation of the new magnetometers. There was some difficulty with a cover which will have to be dealt with later, but is apparently not a major problem. (That's about all I can say about it, because I was paying attention to other things at that point.) On tap for tonight: COSTAR and the coprocessor. The largest remaining issue before the servicing mission can be declared a success is deployment of the solar arrays. While the arrays have been installed, they have not been unfurled or tested. SPA deployment is scheduled for the end of EVA 5. Cheers, Jeff
Return to the Powerful Daisaku Nogami
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