Notice: Due to the conversion of some ACS WFC or HRC observations into

WFPC2, or NICMOS observations after the loss of ACS CCD science

capability in January, there may be an occasional discrepancy between a

proposal's listed (and correct) instrument usage and the abstract that

follows it.

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT # 4439

PERIOD COVERED: UT August 31, September 01, 02, 03, 2007

(DOY 243, 244, 245, 246)

OBSERVATIONS SCHEDULED

ACS/SBC 10840

The FUV fluxes of Tauri stars in the Taurus molecular cloud

Present and forthcoming ground-based and space surveys of the T Tauri

stars in the Taurus molecular cloud will provide information from high

energy stellar and accretion radiation to low energy solid state and

molecular emission from the disk, making those stars perfect

laboratories to carry out self-consistent studies of disk physics and

evolution. We propose to complete this wealth of information by

obtaining ACS/FUV spectra for a significant sample of Taurus T Tauri

stars, covering a range of accretion properties and dust evolutionary

stages. FUV fluxes carry ~ 10 - 100 more energy than X-rays into these

disks and are thus crucial gas heating agents and key to disk dispersal

by photoevaporation. These observations are a pre-requisite to interpret

observations with Spitzer, SOFIA, Herschel, and ALMA, and will become

one of the important legacies of HST to the star formation community.

FGS 11210

The Architecture of Exoplanetary Systems

Are all planetary systems coplanar? Concordance cosmogony makes that

prediction. It is, however, a prediction of extrasolar planetary system

architecture as yet untested by direct observation for main sequence

stars other than the Sun. To provide such a test, we propose to carry

out FGS astrometric studies on four stars hosting seven companions. Our

understanding of the planet formation process will grow as we match not

only system architecture, but formed planet mass and true distance from

the primary with host star characteristics for a wide variety of host

stars and exoplanet masses. We propose that a series of FGS astrometric

observations with demonstrated 1 millisecond of arc per- observation

precision can establish the degree of coplanarity and component true

masses for four extrasolar systems: HD 202206 {brown dwarf+planet}; HD

128311 {planet+planet}, HD 160691 = mu Arae {planet+planet}, and HD

222404AB = gamma Cephei {planet+star}. In each case the companion is

identified as such by assuming that the minimum mass is the actual mass.

For the last target, a known stellar binary system, the companion orbit

is stable only if coplanar with the AB binary orbit.

FGS 11212

Filling the Period Gap for Massive Binaries

The current census of binaries among the massive O-type stars is

seriously incomplete for systems in the period range from years to

millennia because the radial velocity variations are too small and the

angular separations too close for easy detection. Here we propose to

discover binaries in this observational gap through a Faint Guidance

Sensor SNAP survey of relatively bright targets listed in the Galactic O

Star Catalog. Our primary goal is to determine the binary frequency

among those in the cluster/association, field, and runaway groups. The

results will help us assess the role of binaries in massive star

formation and in the processes that lead to the ejection of massive

stars from their natal clusters. The program will also lead to the

identification of new, close binaries that will be targets of long term

spectroscopic and high angular resolution observations to determine

their masses and distances. The results will also be important for the

interpretation of the spectra of suspected and newly identified binary

and multiple systems.

NIC1/NIC2/NIC3 8794

NICMOS Post-SAA calibration - CR Persistence Part 5

A new procedure proposed to alleviate the CR-persistence problem of

NICMOS. Dark frames will be obtained immediately upon exiting the SAA

contour 23, and every time a NICMOS exposure is scheduled within 50

minutes of coming out of the SAA. The darks will be obtained in parallel

in all three NICMOS Cameras. The POST-SAA darks will be non- standard

reference files available to users with a USEAFTER date/time mark. The

keyword 'USEAFTER=date/time' will also be added to the header of each

POST-SAA DARK frame. The keyword must be populated with the time, in

addition to the date, because HST crosses the SAA ~8 times per day so

each POST-SAA DARK will need to have the appropriate time specified, for

users to identify the ones they need. Both the raw and processed images

will be archived as POST-SAA DARKs. Generally we expect that all NICMOS

science/calibration observations started within 50 minutes of leaving an

SAA will need such maps to remove the CR persistence from the science

images. Each observation will need its own CRMAP, as different SAA

passages leave different imprints on the NICMOS detectors.

NIC2 10897

Coronagraphic imaging of the submillimeter debris disk of a 200Myr old

M-dwarf

A recent sub-millimeter survey has unambiguously discovered a new debris

disk around the M0.5 dwarf GJ842.2 which is 200 Myr old. Reanalysis of

the IRAS data has shown that there is also a 25 micron excess toward

this star indicating warm dust close to the star. It is also only the

second debris disk found among M-dwarfs that constitute 70 % of the

stars in the Galaxy. Collisional and Poynting-Roberston timescale

arguments indicate that the cold grains detected in the sub-mm are

``primordial'', i.e. original grains from the protoplanetary phase. The

disk around GJ842.2 is thus unique in terms of the presence of dust at

such a late stage of evolution and presents two conundrums: why did it

retain so much primordial dust at large distances, and why does it

continue to produce dust close to the star? We propose to conduct high

contrast NICMOS coronagraphic imaging of GJ842.2 to determine the

spatial distribution of the small reflecting grains and test the various

scenarios which might explain the IRAS and sub-mm data e.g.resonant

trapping of dust by planets or ``sandblasting'' by interstellar medium

grains working more aggressively on a low-luminosity star than on an

A-type star like Beta Pic. Also, we would search for an evolutionary

sequence between GJ842.2 and the only other M-dwarf with a disk resolved

by HST, the 10 Myr old AU Mic system.

WFPC2 10818

Very Young Globular Clusters in M31 ?

We propose to use HST's unique high spatial resolution imaging

capabilities to conclusively confirm or refute the presence of alleged

very young globular clusters in M31. Such young globular clusters with

ages < 3 Gyr are not present in our galaxy, and, if real, would lead to

a striking difference in the age distribution of the GCs between M31 and

the Milky Way. If the apparent presence of very young globular clusters

in M31 is confirmed through our proposed ACS imaging {now WFPC2 imaging}

with HST, this would suggest major differences in the history of

assembly of the two galaxies, with probable substantial late accretion

into M31 which did not occur in our own galaxy.

WFPC2 10787

Modes of Star Formation and Nuclear Activity in an Early Universe

Laboratory

Nearby compact galaxy groups are uniquely suited to exploring the

mechanisms of star formation amid repeated and ongoing gravitational

encounters, conditions similar to those of the high redshift universe.

These dense groups host a variety of modes of star formation, and they

enable fresh insights into the role of gas in galaxy evolution. With

Spitzer mid-IR observations in hand, we have begun to obtain high

quality, multi-wavelength data for a well- defined sample of 12 nearby

{<4500km/s} compact groups covering the full range of evolutionary

stages. Here we propose to obtain sensitive BVI images with the ACS/WFC,

deep enough to reach the turnover of the globular cluster luminosity

function, and WFPC2 U-band and ACS H-alpha images of Spitzer-identified

regions hosting the most recent star formation. In total, we expect to

detect over 1000 young star clusters forming inside and outside

galaxies, more than 4000 old globular clusters in >40 giant galaxies

{including 16 early-type galaxies}, over 20 tidal features,

approximately 15 AGNs, and intragroup gas in most of the 12 groups.

Combining the proposed ACS images with Chandra observations, UV GALEX

observations, ground-based H-alpha imaging, and HI data, we will conduct

a detailed study of stellar nurseries, dust, gas kinematics, and AGN.

WFPC2 10818

Very Young Globular Clusters in M31 ?

We propose to use HST's unique high spatial resolution imaging

capabilities to conclusively confirm or refute the presence of alleged

very young globular clusters in M31. Such young globular clusters with

ages < 3 Gyr are not present in our galaxy, and, if real, would lead to

a striking difference in the age distribution of the GCs between M31 and

the Milky Way. If the apparent presence of very young globular clusters

in M31 is confirmed through our proposed ACS imaging {now WFPC2 imaging}

with HST, this would suggest major differences in the history of

assembly of the two galaxies, with probable substantial late accretion

into M31 which did not occur in our own galaxy.

WFPC2 11022

WFPC2 Cycle 15 Decontaminations and Associated Observations

This proposal is for the WFPC2 decons. Also included are instrument

monitors tied to decons: photometric stability check, focus monitor,

pre- and post-decon internals {bias, intflats, kspots, & darks}, UV

throughput check, VISFLAT sweep, and internal UV flat check.

WFPC2 11028

WFPC2 Cycle 15 UV Earth Flats

Monitor flat field stability. This proposal obtains sequences of earth

streak flats to improve the quality of pipeline flat fields for the

WFPC2 UV filter set. These Earth flats will complement the UV earth flat

data obtained during cycles 8-14.

WFPC2 11029

WFPC2 CYCLE 15 Intflat Linearity Check and Filter Rotation Anomaly

Monitor

Intflat observations will be taken to provide a linearity check: the

linearity test consists of a series of intflats in F555W, in each gain

and each shutter. A combination of intflats, visflats, and earthflats

will be used to check the repeatability of filter wheel motions.

{Intflat sequences tied to decons, visits 1-18 in prop 10363, have been

moved to the cycle 15 decon proposal xxxx for easier scheduling.} Note:

long-exposure WFPC2 intflats must be scheduled during ACS anneals to

prevent stray light from the WFPC2 lamps from contaminating long ACS

external exposures.

WFPC2 11206

At the cradle of the Milky Way: Formation of the most massive field disk

galaxies at z>1

We propose to obtain 2 orbit WFPC2 F814W images of a sample of the 15

most massive galaxies found at $1 < z < 1.3$. These were culled from

over 20,000 Keck spectra collected as part of DEEP and are unique among

high redshift massive galaxy samples in being kinematically selected.

Through a recent HST NICMOS-2 imaging program {GO- 10532}, we have

confirmed that these galaxies have regular stellar disks, and their

emission line kinematics are not due to gradients from merging

components. These potentially very young galaxies are likely precursors

to massive local disks, assuming no further merging. The proposed WFPC2

and existing NIC-2 data provide colors, stellar masses, and ages of

bulge and disk subcomponents, to assess whether old stellar bulges and

disks are in place at that time or still being built, and constrain

their formation epochs. Finally, this sample will yield the first

statistically significant results on the $z > 1$ evolution of the

size-velocity-luminosity scaling relations, for massive galaxies at

different wavelengths, and constrain whether this evolution reflects

stellar mass growth, or passive evolution, of either bulge or disk

components.

WFPC2 11289

SL2S: The Strong Lensing Legacy Survey

Recent systematic surveys of strong galaxy-galaxy lenses {CLASS, SLACS,

GOODS, etc.} are producing spectacular results for galaxy masses roughly

below a transition mass M~10^13 Mo. The observed lens properties and

their evolution up to z~0.2, consistent with numerical simulations, can

be described by isothermal elliptical potentials. In contrast, modeling

of giant arcs in X-ray luminous clusters {halo masses M >~10^13 Mo}

favors NFW mass profiles, suggesting that dark matter halos are not

significantly affected by baryon cooling. Until recently, lensing

surveys were neither deep nor extended enough to probe the intermediate

mass density regime, which is fundamental for understanding the assembly

of structures. The CFHT Legacy Survey now covers 125 square degrees, and

thus offers a large reservoir of strong lenses probing a large range of

mass densities up to z~1. We have extracted a list of 150 strong lenses

using the most recent CFHTLS data release via automated procedures.

Following our first SNAPSHOT proposal in cycle 15, we propose to

continue the Hubble follow-up targeting a larger list of 130 lensing

candidates. These are intermediate mass range candidates {between

galaxies and clusters} that are selected in the redshift range of 0.2-1

with no a priori X-ray selection. The HST resolution is necessary for

confirming the lensing candidates, accurate modeling of the lenses, and

probing the total mass concentration in galaxy groups up to z~1 with the

largest unbiased sample available to date.

WFPC2 11292

The Ring Plane Crossings of Uranus in 2007

The rings of Uranus turn edge-on to Earth in May and August 2007. In

between, we will have a rare opportunity to see the unlit face of the

rings. With the nine optically thick rings essentially invisible, we

will observe features and phenomena that are normally lost in their

glare. We will use this opportunity to search thoroughly for the

embedded "shepherd" moons long believed to confine the edges of the

rings, setting a mass limit roughly 10 times smaller than that of the

smallest shepherd currently known, Cordelia. We will measure the

vertical thicknesses of the rings and study the faint dust belts only

known to exist from a single Voyager image. We will also study the

colors of the newly-discovered faint, outer rings; recent evidence

suggests that one ring is red and the other blue, implying that each

ring is dominated by a different set of physical processes. We will

employ near- edge-on photometry from 2006 and 2007 to derive the

particle filling factor within the rings, to observe how ring epsilon

responds to the "traffic jam" as particles pass through its narrowest

point, and to test the latest models for preserving eccentricities and

apse alignment within the rings. Moreover, this data set will allow us

to continue monitoring the motions of the inner moons, which have been

found to show possibly chaotic orbital variations; by nearly doubling

the time span of the existing Hubble astrometry, the details of the

variations will become much clearer.

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary reports

of potential non-nominal performance that will be investigated.)

HSTARS:

10968 - ZERO GYRO SAFEMODE ENTRY

HST entered Zero Gyro Software Sunpoint at 243/23:01:54 Z due to failure

of Gyro 2(GRG1_2MC) current reading 0.00ma. ACS safed in ZGSP. Two Gyro

Configuration Test failed at 243/23:01:54.

10970 - OTA Temperatures Out of Limits

At 244/16:45:27 EMRA1T began breaking high yellow limit at -7.79134.

At 244/16:47:23 ESPID6T began breaking high yellow at -15.7403.

At 244/17:44:02 ESPID3T began breaking high yellow limit at -11.5197.

10972 - NICMOS safed @ 245/0258z

NICMOS safed at 245/02:58:50 with two status buffer messages:

Exec 323, P=120712, T=16922

NICMOS 671, P=160145, T=16922

("NED_AD_DATAFIFO_EMPTY").

An Engineering Data Report MSERPROC was also received.

COMPLETED OPS REQUEST:

18123-1 - Power On Gyro 6

18124-1 - ZGSP Recovery

18130-0 - Uplink N02Z8260B, Set ATP Pointer, and Clear ENGREPs

18129-0 - 2nd LBBIAS post G6 Insertion

18128-0 - Bias update post G6 insertion

18127-1 - Modify T2G Rate Damp Timer and Rate Damping Moving Target Limit

18126-0 - PSEA RGA configuration following the failure of RGA-2

18125-1 - FSW Gyro Reconfiguration due to Gyro 2 Failure

18134-1 - Enable FSW Gyro Bias Correction for Slot B (G6)

18132-0 - Perform RGA Bias Update Using LBBIAS

18136-1 - Perform RGA Bias Update using OBSINT

18137-0 - Update on-board gyro bias limit

18141-0 - LBBIAS after long M2G interval

COMPLETED OPS NOTES:

1636-0 - Adjust Structure Current Limit in ZGSP

1638-0 - Temporarily Change Primary Mirror Temperature Limits

1637-0 - Limit Modifications for Gyro 2 Failure and Gyro 6 Power On

1635-0 - Temporarily Change OTA Baffle Temperature Limits

1639-0 - Adjust Safing Limits for Gyro 2 Failure

1640-1 - Adjust PCS Limits for Gyro 2 Failure

1636-2 - Adjust Structure Current Limit in ZGSP

1609-4 - Change JERRCNT Limit

SCHEDULED SUCCESSFUL

FGS GSacq 11 11

FGS REacq 07 07

OBAD with Maneuver 44 44

SIGNIFICANT EVENTS:

FLASH REPORT: Zero Gyro Software Sunpoint entry

At 243/23:01:54 UTC Gyro 2 disparity counts exceeded limits during an

LOS period and HST entered Zero Gyro Software Sun Point. The vehicle was

in M2G mode in orbit night with a vehicle slew in progress when this

occurred. Gyro 2's motor current and digital data were zero after

telemetry was reestablished.

FLASH REPORT: Gyro 6 power on

After examination of the Gyro 2 failure data, Project gave the go ahead

for the power on of Gyro 6. Ops Request 18123-1 was executed at 2007/244

05:55. Gyro turn on was nominal.

Zero Gyro Status Briefing Flash Report - Sept 1, 2007

On Saturday, September 1st at 9am EST a Zero Gyro Entry (Gyro 2 failure)

Status Briefing was held with the Mission Operations Team, Science

Institute and HST Project. Status of each subsystem was provided. PCS

confirmed Gyro 2 failure and that Gyro 6 was powered on at 244/0554 GMT.

Other subsystems are performing nominally and as expected. TCS did

change yellow limits on the OTA Baffle temperature to the SM limits

(w/AD closed). EPS reported a change in the structure current profile

following the anomaly. An Ops Note was issued to increase structure

current ground limits by 0.4 amps (5.4 to 5.8A). There was an increase

of up to 1.5 amps in the structure current profile which EPS is

monitoring.

The team reviewed Safemode Procedure 10 TGS Zero Gyro Sunpoint Safemode

Response and authority to proceed with the recovery was granted. A

telecon was held with the STScI to coordinate the delivery of the Health

& Safety (H&S) SMS and the Science Intercept SMS. STScI reported that

the two SMSs will be generated in parallel and all products should be

delivered around the same time.

Flash Report - Health and Safety Load

The Health and Safety Load for recovering for the ZGSP safe mode

recovery was uplinked at 245/06:30, and started executing nominally at

245/08:00 GMT.

Flash Report NICMOS Safing - STB 671

NICMOS Safed at 2007/245/02:58:50 UTC with a NICMOS 671 status buffer

message indicating the NED A/D data collection FIFO register was empty.

At the time of the event, HST was in orbit day and not passing through

the SAA. ACS remains in Safe and all other SIs are continuing to operate

nominally.

Since that time, HST has commenced operations on the Health & Safety SMS

at 245/08:02:46 UTC. NICMOS commanding later in this SMS will not be

executed until and unless the instrument is recovered.

Flash Report: Commenced Execution of Science Intercept SMS

Execution of the 486 and NSSC-1 Science Intercept SMS loads commenced as

planned on Sunday September 2nd at 8 pm. EST (i.e., 246/00:00:00 UTC).

Flash Report:

All Acquisitions beginning the 246 SMS have been successful through

246/1800. No LOL events have been observed. PCS and FSW are actively

working issues with gyro bias updates. These issues will be discussed at

the 5:00 PM meeting this evening.

-Lynn
____________________________________________________________
Lynn F. Bassford
Hubble Space Telescope
CHAMP Mission Operations Manager

CHAMP Flight Operations Team Manager
Lockheed Martin Mission Services (LMMS)

NASA GSFC PH#: 301-286-2876

"The Hubble Space Telescope is the astronomical observatory and key to unlocking the most cosmic mysteries of the past, present and future."    - 7/26/6