Space Telescope Science Institute   1.3 Photometric Stability

1.4 Cycle 14 WFPC2 Calibration Plan


The overall goals of the Cycle 14 WFPC2 Calibration Programs are to monitor health and safety of the instrument and to maintain required calibration accuracies for the science modes used in Cycle 14. As noted above, starting in Cycle 14 the decontamination procedures (and attendant observations) are performed every 55-60 days due to the more limited target visibility resulting from 2-gyro mode.


Table 1.1: WFPC2 Cycle 14 Calibration Plan.
ID
Proposal Title
Frequency
Estimated Time (orbits)
Scheduling Required
Products
Accuracy
Required
Notes
"External"
"Internal"
10744
WFPC2 Decons &
Associated Observations
Decons every 50-60d
6
94
every 50-60d
CDBS, IHB,
Synphot, WWW reports
1-2%
Decons, phot.monitor, internals, UV throughput, VISFLATS and UVFLATS, darks.
10748
Standard Darks
weekly, exc. decon wk

264
every 7 days, exc.decon wk
CDBS
1 e-/hr
CDBS updates and weekly WWW hot pixel lists.
10745
Internal Monitor
weekly, exc. decon wk

44
every 7 days, exc.decon wk
CDBS
0.8e-/pix
BIAS, INTFLATS in F555W for gain and throughput stability measurements
10749
Visible Earth Flats
continuous

50
mid-to-late
CDBS
0.3%
F502N only (time dependence only)
10750
UV Earth Flats
continuous

20
mid-to-late
CDBS
0.3%
F300W only
10751
Intflat & Visflat Sweeps, Filter Anomaly Check
1/cycle

80
mid-cycle
TIR
0.3%
Flats in all the filters used in Cycle 14, both gain settings/shutters.
10746
CTE Monitor
1/cycle
4

mid-to-late
ISR
0.03 mag
Continue CTE monitor. Test for chip dependence.
10747
Photometric Monitor
1/cycle
7

mid-cycle
ISR,
Synphot
1%
GRW+70D5824 in filter/chip combos used for science in Cycle 14.

~10% reserve

2




Placeholder for unexpected items.
TOTAL TIME (including all executions)
19
552



 1.3 Photometric Stability
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