Proposal 12710 (STScI Edit Number: 0, Created: Tuesday, April 24, 2012 9:14:17 PM EST) - Overview 12710 - UVIS Bright Earth Flats Cycle: 19, Proposal Category: CAL/WFC3 (Availability Mode: RESTRICTED) INVESTIGATORS Name Ms. Jennifer Mack (PI) Dr. Elena Sabbi (CoI) (ESA Member) (Contact) Institution Space Telescope Science Institute Space Telescope Science Institute - ESA E-Mail mack@stsci.edu sabbi@stsci.edu VISITS Visit Targets used in Visit Configurations used in Visit Orbits Used Last Orbit Planner Run 01 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:12:52.0 OP Current with Visit? yes 02 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:12:59.0 yes 03 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:03.0 yes 04 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:07.0 yes 05 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:11.0 yes 06 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:16.0 yes 07 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:20.0 yes 08 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:24.0 yes 09 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:28.0 yes 10 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:33.0 yes 11 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:36.0 yes 12 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:40.0 yes 13 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:45.0 yes 1 Proposal 12710 (STScI Edit Number: 0, Created: Tuesday, April 24, 2012 9:14:17 PM EST) - Overview Visit Targets used in Visit Configurations used in Visit Orbits Used Last Orbit Planner Run 14 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:48.0 OP Current with Visit? yes 15 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:52.0 yes 16 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:13:56.0 yes 17 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:14:00.0 yes 18 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:14:04.0 yes 19 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:14:08.0 yes 20 EARTH-CALIB WFC3/UVIS 1 24-Apr-2012 22:14:12.0 yes 20 Total Orbits Used ABSTRACT We will obtain sky flats in the UV using the bright Earth to fully illuminate the detector. These will allow validation of the L-flat solutions obtained from dithered stellar observations and verification that the wavelength interpolation of these solutions is accurate for filters which were not directly observed. OBSERVING DESCRIPTION Below ~4000Å the Earth is a uniform source of diffuse light due to the high optical depth above the cloud layer. For ACS, the HRC F344N and F330W pipeline flats were derived entirely from Earth flats (Bohlin & Mack, ISRs 2003-02 & 2005-12). For WFC3 UVIS, filters below ~3000Å are expected to contaminated by out of-band light (due to red leaks). Therefore we propose to observe with a set of UV filters in the 3000-4000Å wavelength range: F336W, F343N, F373N, F390M, F395N. A signal of ~100,000 electrons per pixel is required for each flat field to avoid degrading the intrinsic pixel-to-pixel rms P-flat response of <1% for the UVIS detector. A random part of the Earth is observed during occultation so that the individual Earth flat frames will have a low signal from the dimly illuminated night side. To maximize the probability of attaining sufficient signal, routine observations will be instituted (all filters can be obtained in 2.5 orbits repeated 8 times). For ACS/HRC/F330W, the success rate was ~50% so 20 orbits will to ensure several images with adequate illumination are obtained in each filter. The orbits are kept to ~20min each (not including final buffer dump) to ease in schedulability. 2 Proposal 12710, Visit 01, completed Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 01) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 01A 01B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F336W F343N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 01 - UVIS Bright Earth Flats 3 Wed Apr 25 02:14:18 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.5 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 1.0 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 02, completed Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 02) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 02A 02B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F373N F395N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 02 - UVIS Bright Earth Flats 4 Wed Apr 25 02:14:19 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 4.6 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 1.9 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 03, completed Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 03) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 03A 03B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F390M F336W Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 03 - UVIS Bright Earth Flats 5 Wed Apr 25 02:14:20 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.8 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.5 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 04, completed Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 04) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 04A 04B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F343N F373N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 04 - UVIS Bright Earth Flats 6 Wed Apr 25 02:14:20 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 1.0 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 4.6 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 05, completed Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 05) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 05A 05B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F395N F390W Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 05 - UVIS Bright Earth Flats 7 Wed Apr 25 02:14:21 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 1.9 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.8 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 06, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 06) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 06A 06B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F336W F343N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 06 - UVIS Bright Earth Flats 8 Wed Apr 25 02:14:21 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.5 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.9 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 07, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 07) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 07A 07B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F373N F395N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 07 - UVIS Bright Earth Flats 9 Wed Apr 25 02:14:21 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 4.1 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 1.7 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 08, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 08) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 08A 08B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F390M F336W Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 08 - UVIS Bright Earth Flats 10 Wed Apr 25 02:14:22 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.8 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.5 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 09, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 09) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 09A 09B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F343N F373N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 09 - UVIS Bright Earth Flats 11 Wed Apr 25 02:14:22 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.9 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 4.1 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 10, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 10) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 10A 10B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F395N F390M Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 10 - UVIS Bright Earth Flats 12 Wed Apr 25 02:14:23 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 1.7 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.8 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 11, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 11) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 11A 11B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F336W F343N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 11 - UVIS Bright Earth Flats 13 Wed Apr 25 02:14:23 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.5 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.9 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 12, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 12) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 12A 12B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F373N F395N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 12 - UVIS Bright Earth Flats 14 Wed Apr 25 02:14:23 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 4.1 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 1.7 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 13, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 13) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 13A 13B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F390M F336W Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 13 - UVIS Bright Earth Flats 15 Wed Apr 25 02:14:24 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.8 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.5 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 14, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 14) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 14A 14B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F343N F373N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 14 - UVIS Bright Earth Flats 16 Wed Apr 25 02:14:24 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.9 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 4.1 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 15, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 15) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 15A 15B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F395N F390M Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 15 - UVIS Bright Earth Flats 17 Wed Apr 25 02:14:25 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 1.7 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.8 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 16, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 16) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 16A 16B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F336W F343N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 16 - UVIS Bright Earth Flats 18 Wed Apr 25 02:14:25 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.5 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.9 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 17, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 17) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 17A 17B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F373N F395N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 17 - UVIS Bright Earth Flats 19 Wed Apr 25 02:14:25 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 4.1 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 1.7 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 18, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 18) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 18A 18B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F390M F336W Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 18 - UVIS Bright Earth Flats 20 Wed Apr 25 02:14:26 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.8 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.5 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 19, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 19) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 19A 19B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F343N F373N Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 19 - UVIS Bright Earth Flats 21 Wed Apr 25 02:14:26 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 0.9 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 4.1 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1] Proposal 12710, Visit 20, pi Diagnostic Status: Warning Scientific Instruments: WFC3/UVIS Special Requirements: (none) (Visit 20) Warning (Orbit Planner): MAXIMUM DURATION EXCEEDED FOR INTERNAL OR EARTH CALIB SU # 1 2 Label 20A 20B Target EARTH-CALIB EARTH-CALIB Config,Mode,Aperture WFC3/UVIS, ACCUM, UVIS-CENTER WFC3/UVIS, ACCUM, UVIS-CENTER Spectral Els. F395N F390M Opt. Params. CR-SPLIT=NO CR-SPLIT=NO Orbit Structure Exposures Diagnostics Visit Proposal 12710 - Visit 20 - UVIS Bright Earth Flats 22 Wed Apr 25 02:14:27 GMT 2012 Special Reqs. Groups Exp. Time/[Actual Dur.] 1.7 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] 0.8 Secs X 2 [==>(Copy 1)] [==>(Copy 2)] Orbit [1] [1]