Contents: 1) Mission Status 2) FUSE Observers Advisory Committee (FOAC) 3) Target Acquisitions for Visually Bright Sources 4) Updated Web-sites 1) Mission Status FUSE satellite testing is proceeding very well. The refurbished IRUs were reinstalled on March 8 and have been extensively tested since then. The results are very encouraging. In their refurbished state they now have a predicted lifetime of 9 years. We are on track for March 31 shipment to KSC with a presently planned launch on May 20. The UPRM ground station is now enclosed in its protective radome and certification testing is proceeding. Recent UPRM telemetry test operations with the Sampex satellite and the FUSE Satellite Control Center (SCC) at JHU were successful. Additional tests with UPRM, the DSN, Hawaii/USN and the Space Network (TDRSS) are under way. 2) FUSE Observers Advisory Committee (FOAC) formed The FUSE Observers Advisory Committee (FOAC) was recently established by NASA to advise the FUSE Project Scientist and the FUSE Project at JHU on issues related to the use of FUSE by the astronomical community. FOAC members will generally serve for at least 1 year and are asked to attend up to two meetings per year. The membership of the first FOAC is given in the table below. The first meeting of the FOAC will be held in late April 1999. We hope that the FOAC will also serve as an effective advocate for the GI community, and GIs with any FUSE-related concerns are encouraged to express those concerns to the members of the FOAC. Name Institution Joel Bregman Univ. of Michigan Jean-Michel Deharveng LAS/Marseilles Steven Federman Univ. of Toledo Edward Guinan Villanova Univ. Graham Harper Univ. of Colorado John Hutchings DAO/Canada Anuradha Koratkar STScI John Raymond Center for Astrophysics Peter Wannier JPL 3) Target Acquisitions for Visually Bright Sources In preparing for the operational phase of the mission, we have identified a category of target for which special care needs to be taken in order for target acquisitions to be successful. We alert users to this here in order to provide you with an opportunity to take corrective action if you suspect this situation applies to any of your targets. You may be contacted by a FUSE Mission Planner if we feel there is a potential problem with your submitted program. The sources of particular concern are those that are visually bright (V<8) but faint enough in the FUV that a FUV Peak-up acquisition may not work. Such targets cannot be centroided in the Fine Error Sensor camera (because they saturate), and thus any small coordinate differences are not removed. We need to acquire such targets using "Guide Star acq." mode, for which the target coordinates must be specified accurately IN THE HST-GSC FRAME OF REFERENCE. You could supply the best absolute coordinate in the world, but if that coordinate is NOT in the GSC frame of reference we could fail the target acquisition. Currently, such a target cannot be planned for the HIRS aperture, and will only work well for MDRS if the coordinate is accurate to about 1 arcsec with respect to the GSC system. The problem is complicated further because many such targets also have significant proper motions (for which users should have corrected their coordinates when necessary already, but which adds more uncertainty in target position). For any such target that does not have a confirmed accurate RELATIVE coordinate to the guide stars, the user may want to consider using the LWRS aperture, or placing the target on HOLD until the coordinate situation can be analyzed further. Refer to the FUSE Observers Guide on-line for further information about target acquisition. 4) Updated Web-sites As usual, we try to keep the FUSE web sites as up-to-date as possible. You will in particular notice that the GSFC site has recently been significantly enhanced, with both new layout and additional content. Go there for programmatic schedules, preliminary information about GI budgets etc. Updates at the JHU site include a "FUSE Launch Status" page, which allows you to keep up-to-date on the latest developments in the launch campaign. Suggestions for further additions or modifications are, as always, welcome. http://fuse.pha.jhu.edu http://fusewww.gsfc.nasa.gov/fuse/
The Observer's Electronic Newsletter is published Monthly by the FUSE project and is aimed at the FUSE user community. Editor: B-G Andersson, FUSE Guest Investigator Officer. The FUSE Project is managed by Johns Hopkins University's Center for Astrophysical Sciences in Baltimore, MD, for NASA's Goddard Space Flight Center. The FUSE Principal Investigator is Dr. Warren Moos, the FUSE Project Manager at JHU is Mr. Dennis McCarthy, and the NASA Project Scientist for FUSE is Dr. George Sonneborn.
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