Monitoring Active Atmospheres on Uranus and Neptune
We propose Snapshot observations of Uranus and Neptune to monitor changes in their atmospheres on time scales of weeks and months, as we have been doing for the past seven years. Previous Hubble Space Telescope observations (including previous Snapshot programs 8634, 10170, 10534, and 11156), together with near-IR images obtained using adaptive optics on the Keck Telescope, reveal both planets to be dynamic worlds which change on time scales ranging from hours to (terrestrial) years. Uranus equinox occurred in December 2007, and the northern hemisphere is becoming fully visible for the first time since the early 1960s. HST observations during the past several years (Hammel et al. 2005, Icarus 175, 284 and references therein) have revealed strongly wavelength-dependent latitudinal structure, the presence of numerous visible-wavelength cloud features in the northern hemisphere, at least one very long-lived discrete cloud in the southern hemisphere, and in 2006 the first clearly defined dark spot seen on Uranus. Long-term ground-based observations (Lockwood and Jerzekiewicz, 2006, Icarus 180, 442; Hammel and Lockwood 2007, Icarus 186, 291) reveal seasonal brightness changes that seem to demand the appearance of a bright northern polar cap within the next few years. Recent HST and Keck observations of Neptune (Sromovsky et al. 2003, Icarus 163, 256 and references therein) show a general increase in activity at south temperate latitudes until 2004, when Neptune returned to a rather Voyager-like appearance with discrete bright spots rather than active latitude bands. Further Snapshot observations of these two dynamic planets will elucidate the nature of long-term changes in their zonal atmospheric bands and clarify the processes of formation, evolution, and dissipation of discrete albedo features.
We will repeatedly observe Uranus and Neptune to monitor the development, movement, and disappearance of features in their active atmospheres. We will use WFC3 to supply data from which the properties of the scattering/absorbing aerosols associated with various features can be determined.
Filter Selection: WFC3 has a set of four filters in the 890-940 nm range specifically designed to sample methane absorption coefficients of 25., 2.5, 0.25, and 0.025 (km-atm)^{–1} respectively. We will design one Uranus visit type and one Neptune visit type to include these four filters, together with F775W for context, to constrain the vertical aerosol distribution responsible for the latitudinal bands and albedo features seen on both planets. Another visit type for each planet will include the WFC3 analogs of the Str?mgren b and y filters used in Lockwood’s long-term albedo monitoring program, and the methane-band continuum pairs at 619 nm and 727 nm. These filter choices provide continuity both with those used for past HST observations and withpast ground-based observations. Images in the 619-nm methane band [WFC3 FQ619N], in particular, probe the tropospheres of the two planets between 0.5 and 2 bars, where methane isexpected to condense. A third type of visit for each planet originally consisted of NICMOS observations, with filters selected to provide maximum feature contrast and further probe the vertical structureof the atmosphere in discrete regions. We now plan to replace the NICMOS visits with WFC3 visits optimized for detecting low-contrast features.
WFC3:
F467M Str?mgren b
F547M Str?mgren y
FQ619N 619-nm weak methane band
F631N Continuum near 619-nm CH4 band
FQ727N 727-nm medium methane band
FQ750N Continuum near 727-nm CH4 band
F775W Near-IR cont. with some CH4 absorption
F845M Filter with moderate CH4 absorption and high feature contrast
FQ889N CH4 absorption of 25 (km-atm)^{-1}
FQ906N CH4 absorption of 2.5 (km-atm)^{-1}
FQ924N CH4 absorption of 0.25 (km-atm)^{-1}
FQ937N CH4 absorption of 0.025 (km-atm)^{-1}
For the WFC3 filters, exposure times are 18, 6, 22, 40, 60, and 240 seconds for F467M, F547M, F631N, FQ750N, FQ619N, and FQ727N, respectively, for a per-pixel S/N at Uranus center-of-disk that is never less than 95. Exposure times for F775W, FQ889N, FQ906N, FQ924N, and FQ937N are 19, 175, 140, 58, and 28 seconds respectively, with S/N never less than 40. We accept shorter-than-optimal exposure times, and reduced S/N, for the four methane quad filters in the 889-nm band in order to fit them into a 30-minute visit. For the Neptune WFC3 observations, we will accept a further 35% reduction in the S/N to execute the same filter combinations in the same 30-minute window. These visits will use neither dithering nor CR-SPLIT.
The original Phase 2 submission of this proposal included NICMOS filters to sample varying degrees of methane absorption, covering a wide range of penetration depths. In light of NICMOS's doubtful functionality, we now propose to replace the NICMOS visits with WFC3 visits designed to produce maximum-contrast images of Uranus and Neptune. These visits will consist of three repetitions of the standard 2x2 WFC3/UVIS dithering exposure pattern with the F845M filter. Each exposure will be 35 seconds, which gives S/N of 150-200 at Uranus, depending on the feature brightness. S/N at Neptune will exceed 100. These visits will not use CR-SPLIT.
SOLAR SYSTEM
0
false
0.0
0.0
false
false
false
false
false
false
SUPPORTED
SOLAR SYSTEM
PLANET
PLANET URANUS
STD=URANUS
EARTH
SOLAR SYSTEM
PLANET
PLANET URANUS
STD=URANUS
EARTH
SOLAR SYSTEM
PLANET
PLANET URANUS
STD=URANUS
EARTH
SOLAR SYSTEM
PLANET
PLANET NEPTUNE
STD=NEPTUNE
EARTH
SOLAR SYSTEM
PLANET
PLANET NEPTUNE
STD=NEPTUNE
EARTH
SOLAR SYSTEM
PLANET
PLANET NEPTUNE
STD=NEPTUNE
EARTH
WFC3/UVIS
Imaging
No
No
F467M
WFC3/UVIS
Imaging
No
No
F547M
WFC3/UVIS
Imaging
No
No
F631N
WFC3/UVIS
Imaging
No
No
FQ619N
WFC3/UVIS
Imaging
No
No
FQ727N
WFC3/UVIS
Imaging
No
No
FQ750N
WFC3/UVIS
Imaging
No
No
F775W
WFC3/UVIS
Imaging
No
No
FQ889N
WFC3/UVIS
Imaging
No
No
FQ906N
WFC3/UVIS
Imaging
No
No
FQ924N
WFC3/UVIS
Imaging
No
No
FQ937N
NIC1
Imaging
No
No
F095N
NIC1
Imaging
No
No
F097N
NIC1
Imaging
No
No
F108N
NIC1
Imaging
No
No
F160W
NIC1
Imaging
No
No
F170M
WFC3/UVIS
Imaging
No
No
F467M
WFC3/UVIS
Imaging
No
No
F547M
WFC3/UVIS
Imaging
No
No
FQ619N
WFC3/UVIS
Imaging
No
No
F631N
WFC3/UVIS
Imaging
No
No
FQ727N
WFC3/UVIS
Imaging
No
No
FQ750N
WFC3/UVIS
Imaging
No
No
F775W
WFC3/UVIS
Imaging
No
No
FQ889N
WFC3/UVIS
Imaging
No
No
FQ906N
WFC3/UVIS
Imaging
No
No
FQ924N
WFC3/UVIS
Imaging
No
No
FQ937N
NIC1
Imaging
No
No
F095N
NIC1
Imaging
No
No
F097N
NIC1
Imaging
No
No
F108N
NIC1
Imaging
No
No
F160W
NIC1
Imaging
No
No
F170M
POS-TARG
DITHER
0.173
LINE
0.112
false
false
81.785
4
23.884
WFC3-UVIS-DITHER-BOX
1
false
Using ephemeris for target 11630-01-URANUS-BLUE
ephemeris data for target 11630-01-URANUS-BLUE does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.220 to 10.182. ephemeris interval: 08.152 to 10.152
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
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Using ephemeris for target 11630-02-URANUS-CH4
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Using ephemeris for target 11630-03-URANUS-NICMOS
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Using ephemeris for target 11630-04-NEPTUNE-BLUE
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The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
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:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 54928
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11630
:visit-id "60"
:obset-id "60"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11630
:visit-id "60"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 1214
:al-overhead-at-end 0
:internal-dur-at-end 99
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3236
:pcs-gap 0
)
true
1
0
This is a repeat of visit 60 which failed due to a safing.
(Tic-Visit
:proposal-id 11630
:visit-id "60"
:proposal-version -1
:trans-version "20080807"
:date "08-Jul-2009 12:24:25.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 54928
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11630
:visit-id "60"
:obset-id "60"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11630
:visit-id "60"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 1214
:al-overhead-at-end 0
:internal-dur-at-end 99
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3236
:pcs-gap 0
)
false
1
0