Internal Structure and Figures of Binary Asteroids
The goal of this proposal is to obtain very important information on the internal structure of a number of asteroids, and insight on the gravitational reaccumulation-process after a catastrophic disruptive collision. High resolutions observations with the HST/FGS interferometer are proposed to obtain high precision data for the topographic shape and size of a number of selected asteroids. Here we focus on objects with satellites, hence with known masses, so that the bulk density and porosity will be derived in the most accurate manner. This will yield plausible estimates on the internal properties of the objects, test wether they are close or not to figures of equilibrium (in terms of shape and adimensional rotational frequency), and provide estimates of their relative density.
The HST/FGS in interferometric mode is an ideal facility to carry out this program.
We request consecutive scans per orbit mainly for the following reasons: (a) with multiple scans one can detect and reject corrupted scans (from spacecraft jitter); (b) multiple scans are co-added to considerably increase the S/N ratio.
- guide-star acquisition: 6 min;
- target acquisition: 1 min;
- overhead per visit: 1 min;
- overhead per scan: 0.2 min;
- science exposures: our science exposure consists of 4 TRANS scans of 2 arcsec on the sky each sampled every (nominal) 1.0 mas. Since each sample takes a fixed 0.025 s, the 4 scans take 200 s, for a total of 2.5+3.3 ~ 6 min per exposure, allowing approximately 7 exposures per orbit. The strategy is slightly changed in VISIT#9 for the -fainter- Trojan asteroid Patroclus, and in VISIT#8 in accordance with the Orbit Planner.
When observing close to the stationary point, the primary component of the asteroid motion on the sky is the parallax resulting from the orbital motion of the HST platform (it is of the order of 5 mas/s for main belt asteroids but less for Trojans). Thus the asteroid needs to be re-acquired at each visit. Depending on the object, details of the scan strategy may vary slightly. In particular the number of scans would be increased for the faint asteroid 617-Patroclus and the number of visit decreased. No special calibration observations should be necessary in TRANS mode. We shall use stellar template interferograms made available from the STScI, all targets having coulor index B-V~0.7.
Note on special scheduling of targets 4 and 9:
Observations of the binary systems 90-Antiope and 617-Patroclus would preferably be done when the -resolved- components are at maximal separation in the plane-of-sky (this does not concern the other targets since the satellite should not be detected). Accurate timing could be provided, if possible, within a few weeks before the HST acquisition period from ground-based lightcurve observation. These will enable us to schedule, from the knowledge of the rotational phase of the lightcurve extrema, the times of HST observations when the components will be at maximum angular distance. In any case we will provide all the necessary data (coordinates, times of suitable rotational phase, etc.) within six weeks before the HST observations.
Note on two-gyro mode:
Observations should be done at a period when the asteroids are close to their stationnary point. There are generally two such periods possible during Cycle 14, leaving apparently some freedom in the HST scheduling. It is stressed that both periods are given in the Timig Requirements of this Phase II proposal, but that in case of 2 Gyro observing mode, there will unfortunately be only a single visibility period available (except target 1, 22-Kalliope, see Special Requirements of Phase I proposal). In such case one should put highest priority to period where the target is visible.
SOLAR SYSTEM
12
false
0.0
false
false
false
false
false
SUPPORTED
SOLAR SYSTEM
ASTEROID
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
Fixed coordinate position for observation at mid-point of HST orbit. Used to ambush asteroid with FGS TRANS mode.
B-V=0.69
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
Fixed target position of Antiope at 2005.239:13:15:00.0 which is half-way through 1-orbit observation in visit 04.
B-V=0.69
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.71
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.70
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.70
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.70
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.67
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.65
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.72
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.70
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.70
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.70
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
ASTEROID
B-V=0.70
J2000
00 00 0.0000
+00 00 0.00
J2000
SOLAR SYSTEM
B-V=0.69
ASTEROID
ASTEROID KALLIOPE
TYPE=ASTEROID,A=2.90849133,E=0.10284211,I=13.710198,O=66.243406,W=356.267612,M=263.714356,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.66
ASTEROID
ASTEROID EUGENIA
TYPE=ASTEROID,A=2.72060545,E=0.08234574,I=6.609801,O=147.943515,W=85.144735,M=1.296748,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.70
ASTEROID
ASTEROID SYLVIA
TYPE=ASTEROID,A=3.49035712,E=0.07963344,I=10.855641,O=73.332286,W=266.092831,M=38.200981,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.69
ASTEROID
ASTEROID ANTIOPE
TYPE=ASTEROID,A=3.15575199,E=0.15587323,I=2.219795,O=70.234472,W=242.474728,M=330.799223,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.70
ASTEROID
ASTEROID CAMILLA
TYPE=ASTEROID,A=3.47854215,E=0.07890604,I=10.047539,O=173.14659,W=309.772988,M=270.684104,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.72
ASTEROID
ASTEROID HERMIONE
TYPE=ASTEROID,A=3.444091,E=0.1435845,I=7.577398,O=73.426995,W=295.305623,M=156.980182,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.71
ASTEROID
ASTEROID EMMA
TYPE=ASTEROID,A=3.04273942,E=0.15275778,I=7.991571,O=304.505022,W=54.008388,M=86.44919,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.67
ASTEROID
ASTEROID HUENNA
TYPE=ASTEROID,A=3.12994879,E=0.19140078,I=1.668475,O=172.281607,W=180.088608,M=117.808918,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.70
ASTEROID
ASTEROID PATROCLUS
TYPE=ASTEROID,A=5.22791692,E=0.13812707,I=22.033928,O=44.370601,W=307.867935,M=141.609328,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
SOLAR SYSTEM
B-V=0.65
ASTEROID
ASTEROID PULCOVA
TYPE=ASTEROID,A=3.15910252,E=0.09649545,I=13.049588,O=306.038216,W=188.12126,M=349.619666,EQUINOX=J2000,EPOCH=10-MAY-2005:00:00:00
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
FGS
TRANS
No
F583W
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:proposal-id 10614
:visit-id "10"
:proposal-version -1
:trans-version "20051113"
:date "16-Dec-2005 09:55:42.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "05"
:si-bright-earth-limb-angle 15.5
:data-volume 0
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10614
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10614
:visit-id "10"
:orbit-number 1
:pcs-time 339
:si-vis-utilization 2670
:al-overhead-at-end 0
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3257
:pcs-gap 0
)
false
1
0