CIRS-RINGSShads and Verts

An I

C. FerrariSap/DAPNIA/CEA & University Paris 7

Shads & Verts

• Rev 0 to 13: 21 observ.• 98 h• B’~ -24.5° to -20.5°• Large phase coverage• A, B and C rings

First shadows…2004,July 2nd

Cont’d…

Rev. A: 2004, Oct 28th

Pointing problems in Rev. A

• Pointing problems: 15.3, 17.3, 20.9 mrad (3) ~ 4-5 FOVs• rings are ~ 40 mrad wide at ansa• May do radial scans instead

•

Thermal mapsCIRS_007RB_LMP001_PRIME (11.5h) CIRS_009RA_LMP001_PRIME (7h)

A ring

A ring

A ring coverage

A ring 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345M0

M30M60M90M120M150M180D0D30D60D90D120D150D180

Lit FaceUnlit faceShadow

Longitude

Phase angle (M=morning, D=Dusk)

• Shadow egress and morning ansa OK (lit) at : spin and thermal inertia • Miss ingress of shadow• Unlit face: Min T on unlit face, shadow detected ? Vertical structure, dynamics

B ring

B ring

B ring

B ring coverageB ring 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345M0

M30M60

M90M120

M150M180D0D30D60D90D120D150D180

Lit FaceUnlit faceShadow

Phase angle (M=morning, D=Dusk)

• Shadow egress and morning ansa OK (lit) at : spin and thermal inertia • Unlit face: Min T on unlit face, shadow detected ? Vertical structure, dynamics

C ring

C ring

C ring

C ring coverageC ring 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345M0

M30M60M90M120M150M180D0D30D60D90D120D150D180

Lit FaceUnlit faceShadow

Phase angle (M=morning, D=Dusk)

• Shadow egress and morning ansa OK (lit) at many unlit face:

thermal inertia, spin better constrained

• Redesign with CIRSCAN

• Developping ring analysis software

• Data base:– Obsname in DB– Nav kernels in DB used for the pointing