Acq integration times updated based on new ETC
Unable to contact STScI submission server
Unable to contact STScI submission server
----- Submission 1 (Thu Apr 28 14:14:33 GMT 2005) -----
----- Submission 1 (Thu Apr 28 15:01:36 GMT 2005) -----
----- Submission 2 (Tue Mar 21 20:51:26 GMT 2006) -----
All I did was change the Acq integration times. This should not affect schedulability.
Assigned ID: 458
----- Submission 1 (Fri Jan 21 22:22:20 GMT 2005) -----
Imaging Nearby Dusty Disks
Images of circumstellar debris disks around young stars display complex structures that suggest they harbor forming planets. Disks around stars of nearly the same age and mass show dramatically different morphologies including rings with brightness asymmetries and multiple warps. The reasons for this heterogeneity are not understood, nor given the small sample of imaged disks, can we be sure we have yet observed all possible outcomes of the planet formation process. Disk imaging programs have demonstrated that the Hubble Space Telescope is the only excellent platform for the high-contrast detection of scattered light disks in the presence of their bright parent stars. Therefore, we propose a NICMOS imaging survey of the nearest, youngest, stars to Earth with substantial disks known from infrared excess emission.
Integration Times: The NICMOS multiaccum naturally accomplishes a large dynamic range. We use STEP32, NSAMP up to 15 in order to be consistent with other programs and ease calibration.
PSF Subtraction: We proposed to make observations of each disk at two telescope orientations. This procedure distinguishes real disk structure from optical artifacts because the disk appears to rotate about the occulted star while the instrumental ``features'' stay fixed to the detector. For the present project, we propose a sequence of observations just like what the ACS GTO team is doing: observe the disk at one telescope orientation (1 orbit), PSF (1 orbit), disk at orientation 30 deg from the first (1 orbit); these are done in three sequential orbits to minimize telescope thermal changes.
Photometric Calibration: We propose to use a single acquisition filter, F190N, for both objects and PSFs. According to the ETC, our stars will not saturate in this filter in the minimum integration time. Since our PSFs are very close, if not identical, in spectral type to our objects, the flux ratios at F110W should be identical to those at F190N. This will minimize uncertainties in the final disk photometry.
PSF Selection: For each object, we have selected PSFs that are close on the sky, the same spectral type, are brighter, and are not known binaries.
Plan windows: Because of the three back-to-back orbit sequencing requirements combined with the need for a 30 deg roll, our plan windows are very short. Please advise if any of them have scheduling problems.
Target coordinates taken from Hipparcos because all of the objects are too bright for good GSC positions.
STAR FORMATION
12
false
0.0
false
false
false
false
false
SUPPORTED
STAR
F0-F2
J=6.84
HIP7805
J2000
01 40 24.0664
-60 59 56.63
J2000
STAR
F0-F2
PSF for HD 10472
J=6.18
HIP5943
J2000
01 16 29.1000
-67 25 51.70
J2000
STAR
F0-F2
J=6.03
HIP11360
J2000
02 26 16.2400
+06 17 33.19
J2000
STAR
F3-F9
PSF for HD 15115
J=5.47
HIP12447
J2000
00 00 0.0000
+00 00 0.00
J2000
STAR
K V-IV
J=6.54
HIP87815
J2000
17 56 20.1000
+62 36 36.20
J2000
STAR
K V-IV
PSF for HD 164330
J=4.98
HIP88716
J2000
18 06 40.5600
+64 13 17.10
J2000
STAR
F3-F9
J=5.42
HIP90936
J2000
18 33 0.9200
-39 53 31.28
J2000
STAR
F3-F9
PSF for HD 170773
J=5.27
HIP100184
J2000
20 19 17.8500
-47 34 49.04
J2000
STAR
F3-F9
J=6.553
HIP32435
J2000
06 46 13.5400
-83 59 29.50
J2000
STAR
F3-F9
PSF 3.0 deg from HD 53842
J=5.63
HIP32500
J2000
00 00 0.0000
+00 00 0.00
J2000
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
NIC2
Imaging
Yes
No
F110W
/private/tmp/OPVisit48474.xml
1st orientation of HD 10472
Group together with Visit 2 (PSF-HD7858) and Visit 3 (2nd orientation of HD 10472)
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Should have ~74K e- in brightest pixel
total integration = 11 x 256s = 2816 s
/private/tmp/OPVisit48475.xml
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Should get 73K e- in 0.92 s
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Should get 75.5K e- in 0.801 s on H=5.9 F2
21 Mar 2006 - Update Acq integration time with new ETC (error in QE fixed) - should get 74.5e- in 1.059 s
/private/tmp/OPVisit48478.xml
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Should get 76K e- in 0.478s on H=5.3 F3
21 Mar 2006 - Update Acq integration time with new ETC (error in QE fixed) - should get 73.5e- in 0.622 s
/private/tmp/OPVisit48479.xml
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true
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Should get 75.5K e- in 0.801 s on H=5.9 F2
21 Mar 2006 - Update Acq integration time with new ETC (error in QE fixed) - should get 74.5e- in 1.059 s
/private/tmp/OPVisit48480.xml
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Should get 75K e- in 1.138 s on H=6.27 K0
/private/tmp/OPVisit48481.xml
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true
1
0
Should get 84K e- in 0.237 s on H=4.435 K0
/private/tmp/OPVisit48482.xml
(Tic-Visit
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true
1
0
Should get 75K e- in 1.138 s on H=6.27 K0
/private/tmp/OPVisit48483.xml
(Tic-Visit
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true
1
0
Should get 74K e- in 0.457 s on H=5.282 F0
21 Mar 2006 - Redo-ETC (error in QE fixed) - should get 75K e- in 0.622 s
/private/tmp/OPVisit48484.xml
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Should get 74K e- in 0.385 s on H=5.103 F5
21 Mar 2006 - update Acq integration time based on new ETC (fixed QE) - should get 75K e- in 0.529 s
/private/tmp/OPVisit48485.xml
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true
1
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Should get 74K e- in 0.457 s on H=5.282 F0
21 Mar 2006 - Redo-ETC (error in QE fixed) - should get 75K e- in 0.622 s
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true
1
0
Should get 76K e- in 1.324 s on H=6.396 F5
21 Mar 2006 - Update Acq integration time with new ETC (error in QE fixed) - should get 72e- in 1.668 s
total integration = 11 x 256s = 2816 s
/private/tmp/OPVisit48487.xml
(Tic-Visit
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true
1
0
Should get 76K e- in 0.55 s on J=5.625 F3
21 Mar 2006 - Update Acq integration time with new ETC (error in QE fixed) - should get 76K e- in 0.717 s
/private/tmp/OPVisit48488.xml
(Tic-Visit
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:al-overhead-at-end 0
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:dark-offset NIL
:dark-utilization 0
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:low-sky "N"
:pcs-visibility 3662
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true
1
0
Should get 76K e- in 1.324 s on H=6.396 F5
21 Mar 2006 - Update Acq integration time with new ETC (error in QE fixed) - should get 72e- in 1.668 s
total integration = 11 x 256s = 2816 s