The HST Daily Report will not be issued from 12/25/08 to 1/04/09,

inclusive. It will resume on Monday, January 5, 2009.

The HST science proposals that will execute during this hiatus will be

listed at the end of the Daily Report for 12/24.

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT Â Â Â Â #4762

PERIOD COVERED: 5am December 22 - 5am December 23, 2008 (DOY

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 357/1000z-358/1000z)

OBSERVATIONS SCHEDULED

ACS/SBC 11885

SBC Dark Current Measurement

This takes a series of SBC dark measurements over a continuous period of

about 6 hours (4 orbits). The aim is to collect dark images during an

extended SBC on-time. Earlier measurements indicate that the dark

current increases with SBC on-time and may also be increasing with

overall SBC use. The 6-hour time matches the longest time used by any

observer. As with all SBC observations this needs continuous SAA free

time.

FGS 11945

Asteroseismology of Extrasolar Planet Host Stars

Detections of stellar oscillations, although a very demanding task in

terms of observing time, offers a return of more accurate knowledge

about the structure of stars than can be obtained in any other way. In

particular, detecting the 10-15 highest amplitude modes in solar-like

stars to signal-to-noise of just a few sigma each allows robust

constraints on the stellar density to <1%, and the stellar age to within

5-10% of its main sequence lifetime. Ten day observing runs using the

FGS as a photometer on any of the 5 best transiting planet systems would

enable these asteroseismology returns. From more precisely observed

transit shapes than can be obtained from the ground a completely

independent constraint on stellar density to ~1% can be obtained. The

long observation sets required for asteroseismology also provide an

excellent opportunity of detecting transits from other planets, e.g.

hypothesized inner -orbit Hot Earths, should any exist.

WFPC2 11302

WFPC2 CYCLE 16 Standard Darks - Part III

This dark calibration program obtains dark frames every week in order to

provide data for the ongoing calibration of the CCD dark current rate,

and to monitor and characterize the evolution of hot pixels. Over an

extended period these data will also provide a monitor of radiation

damage to the CCDs.

WFPC2 11793

WFPC2 Cycle 16 Internal Monitor

This calibration proposal is the Cycle 15 routine internal monitor for

WFPC2, to be run weekly to monitor the health of the cameras. A variety

of internal exposures are obtained in order to provide a monitor of the

integrity of the CCD camera electronics in both bays (both gain 7 and

gain 15 -- to test stability of gains and bias levels), a test for

quantum efficiency in the CCDs, and a monitor for possible buildup of

contaminants on the CCD windows. These also provide raw data for

generating annual super-bias reference files for the calibration

pipeline.

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:

18370-1 - Adjust NCS CPL Setpoint (6Âº C) @ 358/0033z

COMPLETED OPS NOTES: (None)

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â SCHEDULEDÂ Â Â Â Â SUCCESSFUL

FGS GSacqÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â

FGS REacqÂ Â Â Â Â Â Â Â Â Â Â Â Â Â 13Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 13Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â

OBAD with Maneuver 28Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 28Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â

SIGNIFICANT EVENTS: (None)