Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/observing/status_reports/old_reports_98/hst_status_09_21_98 Дата изменения: Mon Sep 21 16:30:12 1998 Дата индексирования: Sun Dec 23 10:58:04 2007 Кодировка: Поисковые слова: m 31

HUBBLE SPACE TELESCOPE

DAILY REPORT #2212

PERIOD COVERED: 0000Z (UTC) 09/18/98 - 0000Z (UTC) 09/21/98

Daily Status Report as of 264/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed Six 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 observations were executed as scheduled, and no
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 observations were executed as scheduled, and no
anomalies were noted.

1.3 Completed Two Sets of NIC/3 7248 (Spectroscopy and Polarimetry of
the Beta Pictoris)

The Near Infrared Camera (Camera Three) was used to make
spectrographic and polarimetric observations of the star Beta Pictoris.
Little is known about the Beta Pictoris disk within 50 astronomical units
of the central star. The observations were executed as scheduled, and no
anomalies were noted.

1.4 Completed NIC/1 7860 (The Optical Emission Line Nebulae of High
Redshift Radio Galaxies)

The Near Infrared Camera (Camera One) was used to make high
resolution observations of the optical nebula in the high redshifted radio
galaxy 4C+40.36. This is to compare the sizes and detailed structures of
the nebulae to the radio and visual continuum morphologies on sub-galactic
size scales, and relate them to those found in lower redshift radio
galaxies studied with HST and ground-based observatories over the same
wavelength region. The observations were executed as scheduled, and no
anomalies were noted.

1.5 Completed Ten 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. During the fifth and sixth iterations of this proposal, the
acquisition defaulted to control on one FGS only, described in 2.1 and
HSTAR 6680, possibly affecting two observations. Then, the ninth and tenth
iterations of this proposal were affected by the acquisition failure
described in 2.1 and HSTAR 6685 when the take data flag remained down.
Otherwise, the observations were completed as planned, and no further
problems were reported.

1.6 Completed Five 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. During the fourth iteration of this proposal, the acquisition
default to control on one FGS, described in 2.1 and HSTAR 6680, occurred,
possibly affecting four observations. Otherwise, the observations were
completed as planned, and no further problems were reported.

1.7 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 high latitude, parallel POMS test. The final iteration of this
proposal was affected by the acquisition failure described in 2.1 and HSTAR
6685 when the take data flag remained down. Otherwise, the observations
were completed as scheduled, and no further problems were reported.

1.8 Completed 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 galaxy NGC-5982 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.

1.9 Completed Two Sets of NIC/1/2/3 7876 (The Giant Branch Luminosity
Function of M-31's Bulge)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the central bulge of the galaxy M-31 to study its
giant branch luminosity function. A delineation of the differences in the
luminous M giant population of the bulge of M-31 is of considerable
interest for stellar synthesis work and for understanding the evolution of
spiral bulges in general. During the first iteration of this proposal, the
acquisition default to control on one FGS, described in 2.1 and HSTAR 6680,
occurred. Then, the final iteration of this proposal was affected by the
acquisition failure described in 2.1 and HSTAR 6685 when the take data flag
remained down. Otherwise, the observations were completed as planned, and
no further problems were reported.

1.10 Completed Two Sets of 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. During the first iteration
of this proposal, the acquisition default to control on one FGS, described
in 2.1 and HSTAR 6680, occurred. The final iteration of this proposal was
affected by the acquisition failure described in 2.1 and HSTAR 6685 when
the take data flag remained down. Otherwise, the observations were
completed as planned, and no further anomalies were reported.

1.11 Completed WF/PC-2 7502 (Determination of the Extragalactic Distance
Scale.)

The WF/PC-2 was used to make observations of the galaxy NGC-1326 as
part of the determination of the extragalactic distance scale. Many
fundamental problems in cosmology and astrophysics remain unsettled because
the value of the expansion rate is uncertain to a factor of two. The
observations were completed as scheduled, and no anomalies were reported.

1.12 Completed Ten Sets of NIC/2/3 8082 (NICMOS pure parallel Fall 98)

The Near Infrared Camera (Cameras Two and Three) was used to make
pure parallel observations while another instrument is prime. The
observations were executed as scheduled, and no anomalies were noted.

1.13 Completed NIC/2 6767 (A Search for Brown Dwarfs and Luminous Young
Planets in the Hyades)

The Near Infrared Camera (Camera Two) was used to make observations
of the brown dwarf star RHY110 which is located in the Hyades Cluster.
This is to search for substellar companions orbiting low-mass Hyades M
class dwarf stars. Differential imaging was used using methane and water
band (on/off) filter pairs. The observations were completed as planned,
and no problems were reported.

1.14 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 IRAS20000.
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.

1.15 Completed NIC/2 7329 (The Nature of the Damped LyAlpha Absorbers --
A New Study of Young Galaxies)

The Near Infrared Camera (Cameras Two) was used to make observations
of the young galaxy Q2348-0108 in order to study the nature of its damped
Lyman-Alpha Absorbers (DLAs). The DLA line systems, occasionally found in
quasar spectra, provide one of only a few practical methods of detecting
and studying significant numbers of galaxies at high redshifts. The
observations were executed as scheduled, and no anomalies were noted.

1.16 Completed STIS/CCD/NIC/2/3/WF/PC-2 7778 (Absorption Lines From Very
Highly Ionized Atoms in Front of Quasars)

The Space Telescope Imaging Spectrograph (CCD), the WF/PC-2 and the
Near Infrared Camera (Cameras Two and Three) were used to make observations
of quasar HS1700+641 to study foreground absorption lines from highly
ionized atoms. Bright quasars that have a large z{em} and no intervening
Lyman-limit systems with large column densities present an excellent
opportunity to learn more about distant intergalactic gas regions at very
high temperatures. The observations were executed as scheduled, and no
anomalies were noted.

1.17 Completed STIS/CCD/MA1 7295 (Galaxy Rotation Curves at Large Radius
using Lyman-alpha Absorption Lines)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to
make rotational spectrographic observations of the galaxy MARK876. This is
to investigate the outer rotation curves of eight spiral galaxies at very
large galactocentric radii by using the kinematical information from
Lyman-alpha absorption lines in the spectra of background quasars. The
observations were executed as scheduled, and no problems were reported.

1.18 Completed NIC/1/2 7881 (Starbursts: The First Generation)

The Near Infrared Camera (Cameras One and Two) was used to make deep
observations of the star bursting region in the blue, compact, dwarf,
irregular galaxy NGC-1705 to trace its major star formation episodes over a
Hubble time. This is one of the closest star bursting dwarf galaxies.
During this proposal, the acquisition default to control on one FGS,
described in 2.1 and HSTAR 6680, occurred, possibly affecting seven
observations. Otherwise, the observations were executed as scheduled, and
no further anomalies were noted.

1.19 Completed WF/PC-2 6794 (Proper Motions of Herbig-Haro Jets)

The WF/PC-2 was used to make observations of the Herbig-Haro object
HH34-P1 in order to measure the proper-motions of these high Mach number
flows of its two opposing jets. The tangential velocities of several
hundred km/s will produce displacements between our first- and second-epoch
images of 2-4 pixels after only two years. The observations were completed
as planned, and no anomalies were reported.

1.20 Completed NIC/1/2/3 7893 (The Two Types of BL Lac Objects: Extrema
of Jet Physics)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the BL Lac object MS1407+599. These observations will
build on the WF/PC-2 survey of a well-defined sample of 97 BL Lac objects,
for which host galaxies were detected in 90 simulations predict ~100
provide essential constraints on galaxy properties --- luminosity, size,
morphology, and color --- including an unprecedented ensemble of host
galaxy color profiles at subarcsecond spatial resolution. The observations
were executed as scheduled, and no anomalies were noted.

1.21 Completed NIC/1/2/3 7245 (Galaxy Evolution in Rich Clusters)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the galactic cluster CL1603+431. The purpose is to
study the morphological and spectral evolution of galaxies within this
cluster environment. A dark calibration image was also taken. The
observations were completed as planned, and no problems were reported.

1.22 Completed NIC/2 7897 (Probing Planetary Formation Around
Main-Sequence Stars: A Snapshot Survey)

The Near Infrared Camera (Camera Two) was to be used to make
snapshort survey images of the main sequence star HR3314 probing for
planetary formation. The IR excess main-sequence stars host cool
circumstellar dust disks, which are most likely replenished by the debris
of unseen planetesimals. This proposal was affected by the acquisition
failure described in 2.1 and HSTAR 6685 when the take data flag remained
down.

1.23 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 GJ2005ABC.
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.

1.24 Completed NIC/1/2/3 7899 (An IR Search For faint Companions to
Pleiades Very Low-Mass Stars and Brown Dwarfs)

The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of MHO3. This is part of a infrared campaign to search
for faint companions to Pleiades very low-mass stars and brown dwarfs. The
Pleiades has been the best site for brown dwarf {BD} searches, with half of
the presently "confirmed" BDs being Pleiades members. The observations
were executed as scheduled, and no anomalies were noted.

1.25 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.

1.26 Completed STIS/CCD 8071 (HDF-South Flanking Fields)

The Space Telescope Imaging Spectrograph (CCD) was to be used to
make observations of the distant object SAO255267 as part of the HDF-South
flanking field study. This program is designed to provide coverage around
the HDF-South field and to provide a deep optical images of the NICMOS
HDF-South field. As described in HSTAR 6686 and 2.1, two re-acquisitions
for this proposal failed, and the take data flag remained down to two
observations.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions : 22
Successful : 21

The acquisition at 261/111932Z defaulted to fine lock backup on
FGS-3 only when the scan step limit was exceeded on FGS-1. The full
maneuver FHST updates prior to acquisition were successfull as was the
subsequent re-acquisition. HSTAR 6680 was written. The proposals
described in 1.9 and 1.10 may have been affected.

As documented in HSTAR 6682, the acquisition at 262/113821Z
defaulted to fine lock backup on FGS-1 only when FGS-3 suffered a walkdown
failure. The proposals described in 1.5, 1.6, and 1.18 may have been
affected.

HSTAR 6685 describes a guide star acquisition failure that occurred
at 263/104510Z when the FGS-3 search radius limit was exceeded. The
proposals described in 1.5, 1.7, 1.9, 1.10, and 1.22 were affected.

Per HSTAR 6687, the acquisition at 264/052855Z defaulted to fine lock
on FGS-1 only when FGS-3 exceeded the scan step limit. Three proposals
described in tomorrow's report may have been affected: WF/PC-2 6673, STIS
7950, and WF/PC-2 7712.

Scheduled Reacquisitions : 19
Successful : 17

The re-acquisitions at 263/223737Z and at 263/231012Z failed when
the FGS-1 scan step limit was exceeded. HSTAR 6686 was written. The
proposal described in 1.26 was affected.

2.2 FHST Updates:

Scheduled : 49
Successful : 45

Per HSTAR 6681, the full maneuver updates at 261/160513Z and at
261/160758Z failed due to FHST-1. The subsequent acquisiton was successful.

Per HSTAR 6684, the full maneuver updates at 263/103435Z and at
261/103720Z failed due to FHST-1. The subsequent acquisiton was
unsuccessful.

2.3 Operations Notes:

Using ROP SR-1, the SSR EDAC error counter was reset nine times.

HSTAR 6679 describes a NICMOS EDAC single bit error that occurred at
261/095356Z. Per an operations request, the NICMOS error log was dumped at
261/112009Z and the ground system limit was changes to 17.

HSTAR 6683 describes another NICMOS EDAC single bit error that
occurred at 263/100256Z. Per an operations request, the NICMOS error log
was dumped at 263/124225Z and the ground system limit was changes to 18.


3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH