Number 14 March 2001


1)  FUSE Cycle 3 NRA released
2)  FUSE-JHU Restructuring
3)  Reaction Wheel Hiccup.
4)  Documentation Updates
5)  FUSE Data Reduction Pipeline Available
6)  Moving Targets Capabilities Demonstrated
7)  Second Data Workshop Presentations on the Web
8)  Next FOAC meeting

1) FUSE Cycle 3 NRA released

        We are pleased to bring to your attention the release of the call for
proposals for the third year of general observations ("cycle 3").
The NASA Research Announcement (NRA 01-OSS-02) was released on February 16
and calls for Letters of Intent to be submitted by March 30.  Proposal
are due to NASA by May 11, 2001.

        Although FUSE is a PI-Class mission, the majority (75%) of the Cycle 3 
FUSE observing time is available to the general astronomical community.  
NASA expects to allocate approximately 5700 kiloseconds of on-target exposure 
time to GI programs in Cycle 3.

        Please note that the proposal templates, as well as the LaTeX style 
file, have been updated from cycle 2.  The current files and instructions can
be retrieved by sending an e-mail to with the 
word(s) "help" or "request templates" in the "subject" line.

        For further information please consult the following FUSE web sites:

Programmatic & proposal information:

Technical information:
2) FUSE-JHU Restructuring

        In December 2000, the FUSE Chief of Science Operations, Bill Oegerle, 
left JHU for new opportunities as UV/Optical Branch Chief at NASA/GSFC.  
We thank Bill for his strong leadership in guiding the project through its
development phase and the first year of science operations.

        With an eye toward the future, the project at JHU took this opportunity 
to restructure itself, giving more visibility to user support and planning for 
extended mission operations.  Bill Blair became the new Chief of Observatory 
Operations, with Jeff Kruk as his Deputy Chief, as well as Operations Scientist, 
with primary responsibility for the technical side of operations. B-G Andersson 
now heads the User Support Group, which is expected to grow, and Alice Berman 
is now Head of Planning and Scheduling.  We look forward to working with you 
all as the project moves forward.

3) Reaction Wheel Hiccup.

        On February 16 we encountered a problem with one of four reaction 
wheels on FUSE, similar to a problem that occurred to the pitch axis wheel 
last August (please see the September 2000 FUSE Newsletter).  The attitude 
control system determined that the yaw wheel was not generating the expected 
torque, and took it out of the control loop.  Luckily, this happened at a 
time when we had good ground station coverage, and we recovered back onto the 
science timeline (working in three wheel mode) in about 14 hours.

        Analysis of the telemetry showed a number of similarities to the 
earlier event, but some subtle differences as well. Prudence dictated that 
we return the wheel to service as soon as possible in case another wheel 
began to have problems.  We started recovery operations for the yaw wheel 
early on Friday 23 February, and the wheel was fully recovered and back in 
service on Tuesday 27 February.

        The recovery of this wheel took quite a bit more time than the pitch
wheel recovery.  The drag on was significantly higher, and while we cleared one 
obstruction fairly quickly, the residual drag did not reduce to pre-event 
values right away, and we saw significant `glitches' in pointing off and on.  
By Tuesday, these glitches had almost disappeared and the magnitude of the 
remaining events was small enough that science operations would not be affected.
We recovered back onto the science timeline and things have gone smoothly 
since that time.

4) Documentation Updates

        As part of the cycle 3 preparations, as well as in support of the 
release of the CALFUSE pipeline, we have updated and expanded our technical 
and support documentation.  Updates include those to the "FUSE Observer's 
Guide", the templates and instructions to the proposal forms and the FUSE IDL
routines.  New support documents include the "CalFUSE Reference Guide", 
"Reference Guide for the FUSE IDL tools" and the "FUSE Data Analysis Cookbook".
We'd appreciate your feedback and comments, particularly on the new "cookbook".

        The support documentation can be found at:

        A list of FUSE related documentation and other, hopefully useful, 
references can be found in a presentation from the second FUSE Data Workshop:

        FUSE GI Dr. Stephan McCandliss of JHU has kindly made his molecular 
hydrogen optical depth templates available to the FUSE user community.  The 
templates and associated idl programs can be found linked at:

5) FUSE Data Reduction Pipeline Available

        As those of you attending the FUSE data workshop heard the FUSE data 
reduction pipeline (v1.8.7) has now been publicly released.  
In this release, versions for the Solaris and LINUX operating systems are
available. Installation and basic operations manuals are also available on 
line at:

6) Moving Targets Capabilities Demonstrated

        The ability of FUSE to acquire and track Moving Targets (MTs) has been
tested and demonstrated during observations of several Solar System objects. 
As of February 2001, FUSE has successfully observed Saturn's satellite Titan, 
the Io plasma torus, the northern and southern auroral zones of Jupiter, and 
Comet McNaught-Hartley (C/1999 T1).  The latter comet was moving at an 
apparent rate of ~0.05 arcsec/sec and is the fastest MT observed by FUSE to 

7) Second Data Workshop Presentations on the Web

        The second FUSE (GI) Data Workshop was recently held here in
Baltimore, with about 55 people attending.  For those of you who did not 
attend, we have endeavored to collect most of the presentations, or the 
appropriate document references, on our website:

8) Next FOAC meeting

        The FUSE Observer's Advisory Committee (FOAC) is scheduled to meet 
again during the spring, with exact dates still undecided.  If you have any 
issues that you think the FOAC should address, please contact the FOAC chair, 
Prof. Steven Federman at the University of Toledo (, 
or any of the other FOAC members.

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. J.B. Joyce, and the NASA Project Scientist for FUSE 
is Dr. George Sonneborn.

Further information about the FUSE Guest Investigator Program can  be
obtained from:  Dr. George Sonneborn;

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