huygens ground track determination: a comparison of dwe and disr results
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Huygens Ground Track Determination: A Comparison of DWE and DISR Results. R. Dutta-Roy, B. Rizk, S.W. Asmar, D.H. Atkinson, M.K. Bird, M.W. Bushroe, E. Karkoschka, E.A. McFarlane, C. See, M.G. Tomasko, and the DWE and DISR Teams. DPS Cambridge - Poster 45.09 Wednesday, 7 September 2005. - PowerPoint PPT PresentationTRANSCRIPT
Huygens Ground Track Determination:A Comparison of DWE and DISR Results
R. Dutta-Roy, B. Rizk, S.W. Asmar, D.H. Atkinson,
M.K. Bird, M.W. Bushroe, E. Karkoschka,
E.A. McFarlane, C. See, M.G. Tomasko,
and the DWE and DISR Teams
DPS Cambridge - Poster 45.09Wednesday, 7 September 2005
DWE Zonal Winds
26 min gap70 s gaps (VLBI)
166.5
167
167.5
168
-11.5
-11
-10.5
2000 3000 4000 5000 6000 7000 8000 9000
Probe Longitude and Latitude HistoriesFit to Observed Image Points
Eas
t L
on
git
ud
e (o
)L
atitud
e ( o)
Mission Time (sec)
Predicted Landing Site:
167.644o East Longitude
-10.356o Latitude(DTWG Offset)
-10.4
-10.38
-10.36
-10.34
-10.32
-10.3
0
5
10
15
20
167.58 167.6 167.62 167.64 167.66 167.68
Image-Derived Probe Ground Trackadj. to DWE Offset and HASI Altitude Profile
Fit
ted
Lat
itu
de
(o)
Altitu
de (k
m)
Fitted Longitude (o)
DISR Panorama Mosaic – 4 km
ground track(with altitude)
DWE-DISR Zonal Speed
DWE-DISR Ground Track
450 mDWEgap
Huygens Ground Track: Summary
• Mean zonal speed: 67.3 km/h (18.7 m/s)
• Mean meridional speed: 1.4 km/h (0.4 m/s)
• Zonal drift (from start): 166 3 km (3.75)• Latitude drift (from 55 km): 3.5 km (0.078)• Landing Site Latitude: 10.340.17 South
• Landing Site Longitude: 192.340.24 West
Excellent DWE/DISR agreement from 0-55 km