SKA Working Group 7 Level-1 Science: Solar System Bodies
Solar system science, imaging thermal emission and radar imaging
(note: good complementarity with ALMA/NGST)
asteriods = protoplanets 'frozen' in different states of early evolution.
study geological history, prospect for minerals, and probe beneath the
regolith. Radar provides most accurate orbits (by far), particular
interesting for near earth objects, and sub-km-scale imaging.
Planetary satellites: at 20km resolution study cool lava flows on Io,
ice techtonics and water vulcanism, and other surface structure on
large planet satellites.
Kuiper belt objects: best example of physical properties of large
objects in protoplanetry dust disks ('proplids'). Almost nothing
currently known (shapes, masses, rotation).
Comets: imaging gas around comets (OH, other). Get a 3D image of
cometary outflow strucutres, including jets and large fragments.
Additional notes:
WG7 Bologna ; WG7 pre-Groningen
HARD 'NO' for Europe: Fundamental upper frequency limit of antennas
SKA Designs
(requirements matrix)
Red=All agreed that it fails; Dark Blue=some say it fails; Pink=most say
it fails.
| Specification |
Requirement |
China |
Europe |
India |
Ozlens |
Ozcyli |
USA |
Canada |
| A/Tsys |
20000 |
35000 |
10500 |
20000 |
20000 |
20000 |
20000 |
20000 |
| FOV (deg2) |
1 |
0.005 |
1 |
1 |
3.6 |
1 (8) |
1 |
1(FPA) |
| #beams |
1 |
1 |
8 |
1 |
2 |
8 (64) |
1 |
350 |
| beam separation |
|
|
90 |
|
150 |
40x1 |
|
1 |
| #subarrays |
|
few |
many |
many |
many |
many |
many |
few? |
| response time |
|
100 |
<1 |
60 |
60 |
60 |
60 |
100 |
| Freq range |
up to 20 |
0.3-6.0 |
0.15-1.5 |
0.15-10.0 |
0.1-5.0 |
0.10-9.0 |
0.15-34.0 |
0.1-22.0 |
| Corr Bandwith |
freq/5 |
? |
0.2 |
|
3.0 |
2.4 |
3.2 |
4 |
| #spectral channels |
|
|
2x4096 |
|
2x4096 |
2x4096 |
16384 |
|
| sampling time |
|
|
|
|
|
|
short |
|
| max baseline |
350 |
300 |
2000 |
|
3000 |
10000 |
5000 |
|
| 50% area baseline |
|
50 |
100 |
|
4 |
3 |
35 |
|
| Tb sensitivity |
1 |
? |
1 |
1 |
0.7 |
|
1 |
|
| #independent IFs |
|
|
3 |
|
4 |
|
4 |
4 |
| Max sep. of IFs |
|
|
1 |
|
|
|
full band |
full band |
| Spatial DNR |
|
1e+05 |
|
1e+06 |
|
1e+06 |
1e+06 |
1e+06 |
| Spectral DNR |
|
|
|
|
|
|
|
|
| Polarization DNR |
|
|
|
1e+04 |
|
|
1e+04 |
|
| #spatial pixels |
|
|
|
1e+08 |
|
1e+08 |
5e+10 |
|
| Special |
|
|
|
|
|
|
|
|