Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/hst/foc/documents/tips/tips_16mar95.ps Дата изменения: Unknown Дата индексирования: Tue Feb 5 14:51:30 2013 Кодировка: Поисковые слова: comet

SPACETELESCOPESCIENCEINSTITUTE
TIPS
Meeting
16
Mar
1995
R
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
16
February
---
16
March
1995
Operations .
The
F/96
relay
has
been
operating
nominally.
The
F/48
did
pretty
well
too.
Proposals
Executed
.
Five
GO/GTO
proposals
were
executed
with
the
FOC:
5435
Hot
Stellar
Component
in
the
centers
of
M31
&
M32
1
5144
Study
of
Optical
Emission
Associated
with
Radio
Jets
and
Hot
Spots
2
5148
Search
for
Massive
Stars
in
Giant
HII
Regions
in
M31
3
5409
Direct
UV
&
Spectra­Tomographic
Imaging
of
Alpha
Orionis
4
5141
Observations
of
the
Narrow
Line
Regions
in
Nearby
Seyfert
Galaxies
5
Notes: 1
Target
appeared
at
edge
of
the
full
field
of
view,
approximately
6''
from
the
center
of
the
field.
This
was
due
to
a
mis­communication
between
the
GO
and
PRESTO.
2
Images
strongly
degraded;
see
later
TIPS
Meeting
16
Mar
1995
R
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
16
February
---
16
March
1995

SPACETELESCOPESCIENCEINSTITUTE
TIPS
Meeting
16
Mar
1995
R
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
16
February
---
16
March
1995
3
Field
does
not
resemble
that
expected
by
PI,
also
executed
in
Coarse
Track
4
This
proposal
seemed
to
execute
with
no
problems
5
Data
taken
yesterday,
not
inspected
yet.
.
The
following
ENG/CAL
proposal
was
executed
with
the
FOC:
6144
FOC
F/48
High
Voltage
Anomaly
Investigation

SPACETELESCOPESCIENCEINSTITUTE
TIPS
Meeting
16
Mar
1995
R
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
16
February
---
16
March
1995
F/96
Image
Quality
Problem
Images
taken
on
day
95.058­9
showed
a
strong
degradation
compared
to
images
of
the
same
target
taken
just
over
1
year
ago.
There
were
18
images
taken
over
a
15
hour
period
that
all
showed
a
strong
degrada­
tion,
some
worse
than
others.
Typically,
the
degradation
could
be
modelled
by:
.
Convolving
the
old
(good)
data
with
a
gaussian
of
width
5
pixels
=
0.17''
FWHM
.
Convolving
the
old
data
with
a
PSF
corresponding
to
a
defocus
of
15µ
.
Convolving
the
old
data
with
a
PSF
corresponding
to
approximately
100''
of
M1
tilt
Possible
causes:
.
Excessive
jitter
(ruled
out
because
jitter
measurements
were
nominal)
.
Excessive
defocus
in
the
FOC
detector
(ruled
out
because
the
reseau
marks
are
in
focus
.
Excessive
defocus
due
to
moving
the
COSTAR
Deployable
Bench
by
4mm
or
tilting
the
M1
mirror
by
100''
(ruled
out
because
that
would
translate
the
image
depending
on
the
aberration)

SPACETELESCOPESCIENCEINSTITUTE
TIPS
Meeting
16
Mar
1995
R
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
16
February
---
16
March
1995
.
Defocus
in
the
OTA
of
the
equivalent
of
15µ
of
secondary
mirror
movement
The
last
explanation
seeems
most
likely,
if
somewhat
disturbing.
Parallel
WFPC2
images
taken
at
the
same
time
appear
to
show
some
defocus,
although
not
as
much
as
15
microns. Note
that
for
the
5
days
preceding
these
observations
the
telescope
had
been
pointed
in
the
anti­sun
direction,
a
thermal
environment
that
has
not
been
experienced
since
launch.

SPACETELESCOPESCIENCEINSTITUTE
TIPS
Meeting
16
Mar
1995
R
Jedrzejewski
Summary
of
FOC
Activities
for
the
period
16
February
---
16
March
1995
F/48
Detector
Switchon
The
F/48
detector
was
switched
on
to
take
several
internal
exposures
(INTFLATs
and
DARKs) The
background
flare
is
still
present,
as
is
the
arc,
although
they
appeared
to
drop
in
intensity
over
the
4
hours
of
exposures.
The
mean
background
rate
in
the
last
DARK
exposure
was
approximately
0.01
counts/pixel/sec
(aproximately
5x
higher
than
we
had
seen
before
the
problems
started)
The
F/48
camera
will
be
turned
on
again
in
the
95.086
SMS
to
monitor
the
behaviour
of
the
background.
If
we
continue
to
see
relatively
stable
performance,
we
will
resur­
rect
programs
to
locate
the
spectrograph
slit
and
possibly
execute
some
Cycle
5
GTO
science.