Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys
M. Crapeau
(1)
,
S. Rodriguez
(2)
,
S. Le Mouelic
(3)
,
Philippe Paillou
(1, 4, 5)
,
C. Sotin
(3)
,
S. D. Wall
(6)
,
The Vims Science Team
,
The Radar Science Team
1
L3AB -
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux
2 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
3 LPG - Laboratoire de Planétologie et Géodynamique [UMR 6112]
4 OASU - Observatoire aquitain des sciences de l'univers
5 LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
6 JPL - Jet Propulsion Laboratory
2 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
3 LPG - Laboratoire de Planétologie et Géodynamique [UMR 6112]
4 OASU - Observatoire aquitain des sciences de l'univers
5 LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
6 JPL - Jet Propulsion Laboratory
S. Rodriguez
- Fonction : Auteur
- PersonId : 1120973
- IdHAL : sebastien-rodriguez
- ORCID : 0000-0003-1219-0641
- IdRef : 089333438
S. Le Mouelic
- Fonction : Auteur
- PersonId : 179612
- IdHAL : stephane-le-mouelic
- ORCID : 0000-0001-5260-1367
- IdRef : 150709757
The Vims Science Team
- Fonction : Auteur
The Radar Science Team
- Fonction : Auteur
Résumé
The altimeter mode of the Ku-band RADAR experiment onboard the Cassini-Huygens mission has been designed primarily for the study of Titan's surface topography. Inspired by what is done on the Earth in icy contexts like in the Antarctic, Cassini altimetry data can also be used to retrieve the radar reflectivity of Titan's surface and thus, information about its nature. Our first study shows clear contrasts of the radar reflectivity along the altimeter track acquired during the first Titan flyby (Ta). This distinct decrease in radar reflectivity is somewhat correlated with a slight surface height variation. The 13th Titan flyby (T13) provided us VIMS (Visual and Infrared Mapping Spectrometer, operating between 0.3 and 5.1 µm) medium resolution observations of the same region. Infrared I/F along the Ta altimeter track presents a very strong correlation with the computed radar reflectivity. These correlations between infrared I/F and radar reflectivity variations indicate a change in the surface nature and the presence of a clearly defined surface structure under the track. VIMS 2.03/1.27 µm channels ratio transect along the altimeter track also suggests a local enrichment in water ice associated with a smooth depression, maybe witnessing ancient channels.
Domaines
Planétologie et astrophysique de la terre [astro-ph.EP] Planétologie et astrophysique de la terre [astro-ph.EP]Format du dépôt | Notice |
---|---|
Type de dépôt | Communication dans un congrès |
Résumé |
en
The altimeter mode of the Ku-band RADAR experiment onboard the Cassini-Huygens mission has been designed primarily for the study of Titan's surface topography. Inspired by what is done on the Earth in icy contexts like in the Antarctic, Cassini altimetry data can also be used to retrieve the radar reflectivity of Titan's surface and thus, information about its nature. Our first study shows clear contrasts of the radar reflectivity along the altimeter track acquired during the first Titan flyby (Ta). This distinct decrease in radar reflectivity is somewhat correlated with a slight surface height variation. The 13th Titan flyby (T13) provided us VIMS (Visual and Infrared Mapping Spectrometer, operating between 0.3 and 5.1 µm) medium resolution observations of the same region. Infrared I/F along the Ta altimeter track presents a very strong correlation with the computed radar reflectivity. These correlations between infrared I/F and radar reflectivity variations indicate a change in the surface nature and the presence of a clearly defined surface structure under the track. VIMS 2.03/1.27 µm channels ratio transect along the altimeter track also suggests a local enrichment in water ice associated with a smooth depression, maybe witnessing ancient channels.
|
Titre |
en
Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys
|
Auteur(s) |
M. Crapeau
1
, S. Rodriguez
2
, S. Le Mouelic
3
, Philippe Paillou
1, 4, 5
, C. Sotin
3
, S. D. Wall
6
, The Vims Science Team
, The Radar Science Team
1
L3AB -
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux
( 777 )
- BP89 33270 Floirac
- France
2
AIM (UMR7158 / UMR_E_9005 / UM_112) -
Astrophysique Interprétation Modélisation
( 2068 )
- AIM - UMR 7158 - UMR E 9005,
ex "Astrophysique Interactions Multi-échelles",
Service d'astrophysique,
CEA/Saclay,
Orme des Merisiers
F-91191 GIF SUR YVETTE CEDEX
- France
3
LPG -
Laboratoire de Planétologie et Géodynamique [UMR 6112]
( 830 )
- 2 Rue de la Houssinière - BP 92208 44322 NANTES CEDEX 3
- France
4
OASU -
Observatoire aquitain des sciences de l'univers
( 1880 )
- 0ASU - Site de Floirac 2 rue de l'Observatoire - BP 89 33270 FLOIRAC
- France
5
LAB -
Laboratoire d'Astrophysique de Bordeaux [Pessac]
( 29442 )
- Bât B18N - Allée Geoffroy Saint Hilaire
CS 50023 - 33615 Pessac Cedex France
- France
6
JPL -
Jet Propulsion Laboratory
( 61129 )
- 4800 Oak Grove Drive, Pasadena, CA 91109-8099, USA
- États-Unis
|
Titre de l'ouvrage |
2006DPS....38.4806C - Bulletin of the American Astronomical Society
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Invité |
Non
|
Langue du document |
Anglais
|
Pays |
États-Unis
|
Actes |
Oui
|
Audience |
Internationale
|
Date de publication |
2006
|
Volume |
38
|
Page/Identifiant |
575
|
Titre du congrès |
American Astronomical Society, DPS meeting #38, #48.06;
|
Date début congrès |
2006
|
Domaine(s) |
|
ADS Id | 2006DPS....38.4806C |
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