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SPACE
TELESCOPE
SCIENCE
INSTITUTE
TIPS
Meeting
6
March
1997
R.
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
27
February
-
6
March
1997
FOC+COSTAR
Status
The
FOC
F/96
relay
is
working
fine
FOC/48
relay
has
not
been
used
Events FOC/96
Baseline
Throughput
executed
on
Monday
March
3
1997.
Exposures
of
the
spectrophotometric
standard
star
BPM16274
were
taken
using
a
variety
of
filters
and
the
results
compared
to
identical
data
tak
en
in
1993.
The
COSTAR/
FOC
arms
are
not
deployed,
so
the
PSF
is
aberrated.

SPACE
TELESCOPE
SCIENCE
INSTITUTE
TIPS
Meeting
6
March
1997
R.
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
27
February
-
6
March
1997
FOC
F/96
F410M
image
of
BPM16274
(no
COST
AR)

SPACE
TELESCOPE
SCIENCE
INSTITUTE
TIPS
Meeting
6
March
1997
R.
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
27
February
-
6
March
1997
Results The
PSF
looks
qualitatively
like
the
last
time
we
saw
it
in
1993,
except:
.
the
focus
is
different
(was
approximately
7
microns
from
``nominal''
f
or
the
1993
data)
.
the
coma
was
different
(a
coma­correcting
move
was
made
shortly
after
the
1993
data
were
taken)
Comparing
the
count
rates
within
a
3
arcsec
radius
aperture
for
identical
images
(same
filters,
same
formats,
very
similar
position
on
the
FOC
detector)
shows
a
sys­
tematic
difference
of
~10%,
independent
of
wavelength.
We
know
this
is
not
due
to
the
OTA
(WFPC
doesn't
see
this)
or
COST
AR
(FOC
arms
retracted),
so
it
has
to
be
in
the
FOC.
We
have
seen
indications
over
the
past
12­18
months
of
a
slow
decline
in
sensitivity ,
amounting
to
~10%,
so
we
don't
think
the
sen­
sitivity
change
has
anything
to
do
with
the
Servicing
Mission.
The
lack
of
dependence
on
wavelength
would
suggest
that
the
effect
is
not
due
to
contamination.

SPACE
TELESCOPE
SCIENCE
INSTITUTE
TIPS
Meeting
6
March
1997
R.
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
27
February
-
6
March
1997

SPACE
TELESCOPE
SCIENCE
INSTITUTE
TIPS
Meeting
6
March
1997
R.
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
27
February
-
6
March
1997
Upcoming
Events
The
next
FOC
activities
come
after
the
COST
AR/FOC
arms
are
deployed,
on
March
20.