Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_98/hst_status_08_24_98 Дата изменения: Mon Aug 24 15:50:24 1998 Дата индексирования: Sun Dec 23 10:57:33 2007 Кодировка: Поисковые слова: jupiter's moons

HUBBLE SPACE TELESCOPE

DAILY REPORT #2193

PERIOD COVERED: 0000Z (UTC) 08/21/98 - 0000Z (UTC) 08/24/98

Daily Status Report as of 236/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Eight Sets of WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental
Darks pt2/3)

The WF/PC-2 was used to make a series of Cycle 7 supplemental
calibration darks. This dark calibration program obtains three dark frames
every day to provide data for monitoring and characterizing the evolution
of hot pixels. The acquisition default to fine lock on one FGS only
described in 2.1 occurred during the final iteration of this proposal.
Otherwise, the observations were executed as scheduled, and no other
anomalies were noted.

1.2 Completed Six Sets of STIS/CCD 7948 (CCD Dark and Bias Monitor --
Cont. to Dec. 98)

The Space Telescope Imaging Spectrograph (CCD) was used to measure
CCD dark current and bias rates for the two supported amplifier settings
{GAIN=1 and GAIN=4} in order to gather data for making superdarks and
superbiases. The data will be used to track the growth of hot pixels on
the CCD in general and within the various target acquisition apertures
specifically. The acquisition default to fine lock on one FGS only
described in 2.1 occurred during the final iteration of this proposal.
Otherwise, the observations were executed as scheduled, and no other
anomalies were noted.

1.3 Completed WF/PC-2/STIS/CCD/NIC/1/2/3 7307 (The Formation and
Evolution of Rich Star Clusters in the LMC)

The WF/PC-2, the Space Telescope Imaging Spectrograph (CCD), and the
Near Infrared Camera (Cameras One, Two and Three) were used to make
observations of the rich star clusters which are located within the Large
Magellanic Cloud in order to study their formation and evolution. These
observations will help us understand the origin and evolution of rich star
clusters in our own galaxy. The observations were completed as scheduled,
and no anomalies were reported.

1.4 Completed Two Sets of NIC/1/2/3 7886 (NICMOS Snap Shot Survey of
Early-Type Galaxies)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the early-type galaxies NGC-4589 and NGC-7052 as part
of a snap-shot broad-band imaging survey. Since almost all early-type
galaxies harbor dust, these images which are less sensitive to extinction
and will provide superior light profiles for dynamical studies of the cores
of these galaxies. The observations were completed as scheduled, and no
problems were reported.

1.5 Completed NIC/2 7853 (Deep IR Imaging of Two Gas-Rich Radio Galaxies)

The Near Infrared Camera (Camera Two) was used to make high
resolution continuum, line and polarization images of the gas-rich radio
galaxy 3C293. This is to obtain a deep IR image to locate the true nuclei
and clarify the structure of the galaxies in order to test merger models.
The observations were executed as scheduled, and no anomalies were noted.

1.6 Completed Eleven Sets of STIS/CCD 8062 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation)

The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations take in parallel with the prime science
observations. The acquisition default to fine lock on one FGS only
described in 2.1 occurred during the sixth iteration of this proposal.
The seventh and eighth iterations of this proposal were affected by the
STIS suspend event described in 2.3. Otherwise, the observations were
completed as planned, and no further problems were reported.

1.7 Completed Three Sets of NIC/1/2 7858 (The Composition of Kuiper Belt
Objects)

The Near Infrared Camera (Cameras One and Two) was used to
investigate the small body A1996T066 recently discovered in the outer solar
system that appears to be unique both in composition and diversity compared
to other classes of solar system objects. The proposal completed as
planned, and no anomalies were noted.

1.8 Completed WF/PC-2 7619 (WF/PC-2 Cycle 7 Decontamination)

The WF/PC-2 was used to conduct a Cycle 7 decontamination procedure.
Ultraviolet-blocking contaminants were removed, and hot pixels cured, by
warming the CCDs to +20C for 6 hours. A variety of internal images were
taken before and after the decontamination in order to verify its success
and to monitor the instrument health. The procedures were conducted as
scheduled, and no problems were reported.

1.9 Completed STIS/MA1 7471 (STIS Snapshot Search for UV-bright High
Redshift Quasars)

The Space Telescope Imaging Spectrograph (MA1) was used to make
ultraviolet observations of the bright high redshifted quasar HE2318-110.
This quasar shows no signs of strong absorption in its optical spectra, and
its He-II Lambda 304 A0 line is accessible with HST. The observations were
executed as scheduled, and no anomalies were noted.

1.10 Completed Two Sets of STIS/CCD/MA1 7583 (Spatial & Temporal
Variations in the UV Emission from the Atmosphere of Io)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
look for spatial and temporal variations in the ultraviolet emissions from
the atmosphere of Jupiter's moon Io. Measurements of the spatial
distribution of Io's hydrogen, sulfur and oxygen far-ultraviolet emissions
were obtained using STIS spectroscopic and imaging modes. A wavelength
calibration image was also taken. The observations were executed as
scheduled, and no anomalies were noted.

1.11 Completed WF/PC-2 7623 (WF/PC-2 Cycle 7 Internal Flats)

The WF/PC-2 was used to make a set of internal Cycle 7 calibration
flats which are designed to monitor the pixel to pixel flat field response
and the visflat lamp degradation, as well as detect any possible changes
due to contamination. The calibration observations were completed as
planned, and no problems were reported.

1.12 Completed STIS/CCD 7928 (STIS Spectroscopic CCD Flatfielding --
Continued)

The Space Telescope Imaging Spectrograph (CCD) was used to make CCD
flat field calibration images in the STIS spectroscopic mode. The
calibrations were completed as planned, and no problems were reported.

1.13 Completed Two Sets of NIC/1/2/3 7875 (Searching for Old Stellar
Populations in Candidate Proto-Spheroidals)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations searching for old stellar populations in candidate
proto-spheroid SA68-6597 and SA68-1067. We have compelling evidence from
WF/PC-2 images that these galaxies have optical colors gradients. The
near-infrared is necessary, however, to reveal color gradients large enough
to separate young and old stellar populations. Only NICMOS imaging
provides enough spatial resolution and depth to resolve these gradients.
The observations were completed as planned, and no problems were reported.

1.14 Completed Six Sets of WF/PC-2 7909 (POMS Test Proposal: WF II
Parallel Archive Proposal)

The WF/PC-2 was used to make parallel observations as part of the
POMS test proposal. This test proposal is designed to simulate scientific
plans. The observations were completed as planned, and no problems were
reported.

1.15 Completed NIC/1/2/3 7857 (Investigating the Missing Link Between
Disks Around Pre-Main Sequence and Main Sequence Stars)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of star HD135344. Various observations and models of the
circumstellar disk around the Main Sequence IR excess star Beta Pictors
tend to show that the optically thin dust disk is the result of destruction
processes among planetesimals. The observations were completed as planned,
and no problems were reported.

1.16 Completed WF/PC-2 7618 (WF/PC-2 Cycle 7 Photometric Monitor UV/OPT STD)

The WF/PC-2 was used to make observations of the standard star
GRW+70D582 as part of a Cycle 7 photometric monitoring program. This
ultraviolet spectrophotometric standard star was observed in a variety of
filters and cameras to monitor the photometric stability and quantum
efficiency of WF/PC-2 from the far-ultraviolet to near-infrared. The
observations were completed as scheduled, and no problems were reported.

1.17 Completed Two Sets of NIC/2/3 7907 (NICMOS Pure Parallel Winter 97-98)

The Near Infrared Camera (Cameras Two and Three) was used to make
pure parallel spectrographic observations of sky regions when another
instrument is prime. The observations were completed as planned, and no
anomalies were reported.

1.18 Completed NIC/1/2/3 7830 (IR Spectra for Known-Mass M Dwarfs)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make infrared spectrographic observations of M-Class dwarf star LHS1826.
Over the last decade there has been considerable debate on two major issues
in the low-mass star literature: {1} the effective temperature scale for M
dwarfs and its relation to mass and luminosity and {2} the conversion from
an absolute magnitude in some passband to a bolometric magnitude. The
observations were executed as scheduled, and no anomalies were noted.

1.19 Completed WF/PC-2 7387 (T-Tauri Star Snapshot Survey)

The WF/PC-2 was used to make observations of the star SZ-34 as part
of a T-Tauri class star survey. The observations were executed as
scheduled, and no anomalies were noted.

1.20 Completed Two Sets of WF/PC-2 7431 (Snapshot Survey of Microlensed
Source Stars)

The WF/PC-2 was used to make snapshot survey images of microlensed
source stars 97-BLD-23 and MACHO-96-B. Gravitational microlensing surveys
have revealed an excess of lensing events over theoretical predictions
toward both the Large Magellanic Cloud and the Galactic Bulge. The
observations were completed as planned, and no anomalies were reported.

1.21 Completed NIC/1/2/3 7898 (Snapshot Survey of Proto-planetary Nebulae)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make snapshot survey observations of the protoplanetary nebula SAO163075.
This is to help discern the structure of the nebulae and the evolutionary
sequence that produces axially symmetric planetary nebulae. The
observations were executed as scheduled, and no anomalies were noted.

1.22 Completed Two Sets of STIS/CCD 7912 (STIS Parallel Archive Proposal
- Nearby Galaxies - Imaging and Spectroscopy)

The Space Telescope Imaging Spectrograph (CCD) was used to make
parallel observations of nearby galaxies. This survey will be useful to
study the star formation histories, chemical evolution, and distances to
these galaxies. These data will be placed immediately into the Hubble Data
Archive. The observations were completed as scheduled, and no problems
were reported.

1.23 Completed FGS 7488 (A Search for Main-Belt Binary Asteroids)

The Fine Guidance Sensors were used to make astrometric observations
of the main belt asteroid Ariadne to search for a possible companion
moon/asteroid. The targets was chosen on the basis of an extensive
analysis based mainly on peculiar photometric properties suggesting a
possible binary nature. The observations were completed as planned, and no
problems were noted.

1.24 Completed WF/PC-2 8059 (POMS Test Proposal: WF-2 Targeted Parallel
Archive Proposal)

The WF/PC-2 was used to make observations in parallel with the prime
science observations. The parallel opportunities available with WF/PC-2 in
the neighborhood of bright galaxies are treated in a slightly different way
from the normal pure parallels. Local group galaxies offer the opportunity
for a closer look at young stellar populations. The observations were
completed as planned, and no anomalies were reported.

1.25 Completed STIS/CCD/MA1/WF/PC-2/NIC/1/2 7570 (Spectra of Moderate Z
Cluster Galaxies)

The Space Telescope Imaging Spectrograph (CCD and MA1), The WF/PC-2
and the Near Infrared Camera (Cameras One and Two) were all used to make
spectrographic observations of the galaxy A2390-1010. The observations
will be used to study the morphology and spectrographic gradients in the cD
class galaxy and to look for the cooling flow in O-VI line data. The
observations were completed as planned, and no anomalies were noted.

1.26 Completed NIC/1 7833 (Multiplicity Survey of Alpha Persei: Studying
the Evolution and Effects of Companions)

The Near Infrared Camera (Camera One) was used to make observations
of the star Alpha-Persei. Extensive observations have established that
binaries are twice as common amongst pre-main sequence stars than older
solar neighborhood G-dwarfs. The acquisition default to fine lock on one
FGS only described in 2.1 occurred during this proposal. Otherwise, the
observations were executed as scheduled, and no further anomalies were
noted.

1.27 Completed NIC/1/2/3 7838 (Search for ionized material around Cyg X-3)

The Near Infrared Camera (Camera One, Two and Three) was used to
make a search for ionized material around V1521-Cyg (a.k.a., Cyg X-3).
Models of the evolution of massive binaries predict that a few such objects
should survive the common envelope phase and result in systems containing a
compact object plus a Wolf-Rayet star {c+WR}. The observations were
completed as planned, and no anomalies were noted.

1.28 Completed NIC/1/2/3 7855 (The Evolution of Powerful Radio Galaxies)

The Near Infrared Camera (Camera One, Two and Three) was used to
make observations of the powerful radio galaxy 3C460. Our proposed NICMOS
observations combined with our multi-wavelength observing program will
finally provide us with the data we need to build a picture of how powerful
radio galaxies evolve. The observations were completed as planned, and no
problems were reported.

1.29 Completed Two Sets of STIS/CCD 8064 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal - Backup)

The Space Telescope Imaging Spectrograph (CCD) was used to conduct a
non-scripted parallel POMS test. The first iteration of this proposal was
affected by the STIS suspend event described in 2.3. Otherwise, the
observations were completed as scheduled, and no further problems were
reported.

1.30 Completed NIC/2 7887 (A Survey of Gravitational Lenses as
Cosmological Tools II)

The Near Infrared Camera (Camera Two) was used to make observations
of the gravitational lens candidate system MGC2214+35. The propose is to
extend our IR survey of gravitational lenses and gravitational lens
candidates by obtaining NICMOS images of 14 additional lens systems or
candidates. The observations were executed as scheduled, and no anomalies
were noted.

1.31 Completed WF/PC-2 8061 (POMS Test Proposal: WF-II Backup Parallel
Archive Proposal)

This is a POMS test proposal designed to simulate scientific plans.
The proposal was executed as planned, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 28
Successful : 28

HSTAR 6634 documents a quide star acquisition that defaulted to fine
lock back-up on FGS-1 only at 235/021823Z when the FGS-3 scan step limit
was exceeded. The proposals described in 1.1, 1.2, 1.6, and 1.26 may have
been affected.

Scheduled Reacquisitions : 21
Successful : 21

2.2 FHST Updates:

Scheduled : 51
Successful : 51

2.3 Operations Notes:

Using ROP SR-1, the SSR EDAC error counter was cleared eight times.

Operations personnel successfully completed the Guam Remote Ground
Terminal (GRGT) proficiency support via WT/TDRS-275 at 233/1406Z. The
spacecraft was configured for LGA support, transmitting both 4 and 32 kbps
engineering data with no problems experienced.

The STIS MCE2 reset at 233/170100Z while outside an SAA interval and
while the high voltage was off. Per ROP NS-12, the STIS flight software
error counter was reset at 233/1730Z. Recovery will be accomplished via
the SMS at the time of the next MAMA2 high voltage on event at 236/170149Z.

The solar eclipse occurring from 234/0002Z until 234/0229Z was
managed uneventfully as directed by an operations request.

The STIS instrument suspended at 235/051838Z. A status buffer
message was received referring to an MCE-2 initialization time-out. HSTAR
6633 was written. STIS memory and the MAMA command log were dumped at
235/1012Z. The suspend event was found to be caused by the residual effect
caused by an MCE-2 reset that occurred during the MAMA-2 low voltage (LV)
off transition prior to the entrance of this SAA passage. The LV
transition started at 235/050444Z and the MCE-2 reset occurred in the
preceding six seconds. This latter event caused the MCE processor to start
the six-second reset recovery initialization. This command was processed
by the CS, terminating the initialization time-out check but not resetting
the count of initialization time used. As a result, when the MAMA-2 LV was
turned back on, the monitor found a value that didn't allow the full six
second time for the MCE turn-on initialization. This oversight exists in
the STIS software (to not reset the initialization time used monitor as
part of the MCE LV turn-on). This is the first occurrence of this sequence
of events since the MCE reset processing code was installed. Until a long
term flight software solution is implemented, SMSs will have patches to
the MAMA-1 and MAMA-2 commanding to set the counter back to zero prior to
the LV turn-on transition. Since the problem was understood, STIS was
recovered at the earliest opportunity. Accordingly, STIS was recovered
from suspend at 235/1407Z as instructed by an operations request.
Proposals described in 1.6 and 1.29 above (a total of three observations)
were affected.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH