Notice: For the foreseeable future, the daily reports may contain

apparent discrepancies between some proposal descriptions and the listed

instrument usage. This is due to the conversion of previously approved

ACS WFC or HRC observations into WFPC2, or NICMOS observations

subsequent to the loss of ACS CCD science capability in late January.

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT    # 4394

PERIOD COVERED: UT June 28, 2007 (DOY 179)

OBSERVATIONS SCHEDULED

FGS 11214

HST/FGS Astrometric Search for Young Planets Around Beta Pic and AU Mic

Beta Pic and AU Mic are two nearby Vega-type debris disk stars. Both of

these disk systems have been spatially resolved in exquisite detail,

predominantly via the ACS coronagraph and WFPC-2 cameras onboard HST.

These images exhibit a wealth of morphological features which provide

compelling indirect evidence that these systems likely harbor

short-period planetary body{ies}. We propose to use the superlative

astrometric capabilities of HST/FGS to directly detect these planets,

hence provide the first direct planet detection in a Vega-type system

whose disk has been imaged at high spatial resolution.

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 DARKSs. 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.

NIC3 11062

NICMOS non-linearity tests

This program incorporates a number of tests to analyse the count rate

dependent non- linearity seen in NICMOS spectro-photometric

observations. We will observe a field with stars of a range in

luminosity in NGC3603 with NICMOS in NIC1: F090M, F110W, F140W, F160W

NIC2: F110W, F160W, F187W, F205W, and F222M NIC3: F110W, F150W, F160W,

F175W, and F222M. We will repeat the observations with flatfield lamp

on, creating artificially high count-rates, allowing tests of NICMOS

linearity as function of count rate. We first take exposures with the

lamp off, then exposures with the lamp on, and repeat at the end with

lamp off. Finally, we continue with taking darks during occultation. We

will furthermore observe spectro-photometric standard P041C using the

G096, G141, and G206 grisms in NIC3, and repeat the lamp off/on/off test

to artificially create a high background.

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 Millky 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 11025

WFPC2 Cycle 15 CTE Monitor

Monitor CTE changes during Cycle 15. Test for chip-to-chip differences

in CTE.

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary reports

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

HSTARS: (None)

COMPLETED OPS REQUEST: (None)

                               SCHEDULED    SUCCESSFUL     

FGS GSacq                        9                  9                     

FGS REacq                        1                  1                 

OBAD with Maneuver         18                18                                         

COMPLETED OPS NOTES: (None)

SIGNIFICANT EVENTS: (None)