Mission Information
MISSION_NAME SATURN OCCULTATION OF 28 SAGITTARIUS 1989
MISSION_ALIAS
MISSION_START_DATE 1989-07-03T12:00:00.000Z
MISSION_STOP_DATE 1989-07-03T12:00:00.000Z
MISSION_DESCRIPTION 
Mission Overview
  ================
 
    Most of our quantitative knowledge of the optical depths and
    detailed radial structure in the Saturn ring system is derived
    from occultation experiments carried out by the Voyager
    spacecraft. On 3 July 1989 an occultation of the bright star 28
    Sagittarii provided a rare opportunity for occultation
    observations of both Saturn and its rings with Earth-based
    telescopes (NICHOLSONETAL2000).
 
    Although no formal NASA 'mission' was organized for the
    occultation, data acquired for Saturn and its rings were some
    of the best obtained since the Voyager encounters and serve as
    a useful bridge to the upcoming Cassini mission in 2004-2008.
    To foster the combined analysis of data from different sources
    and thereby to maximize the scientific return from this
    'mission', the PDS Rings Node is archiving data from the
    1989 occultation.
MISSION_OBJECTIVES_SUMMARY 
Mission Objectives Overview
  ===========================
 
    Obtain high resolution ring optical depth and planet atmosphere
    profiles.
REFERENCE_DESCRIPTION French, R.G., and P.D. Nicholson, Saturn's Rings II. Particle sizes inferred from stellar occultation data, Icarus, 145, 502-523, 2000.

French, R.G., P.D. Nicholson, M.L. Cooke, J.L. Elliot, K. Matthews, O. Perkovic, E. Tollestrup, P. Harvey, N.J. Chanover, M.A. Clark, E.W. Dunham, W. Forrest, J. Harrington, J. Pipher, A. Brahic, I. Grenier, F. Roques, and M. Arndt, Geometry of the Saturn System from the 3 July 1989 Occultation of 28 Sgr and Voyager Observations, Icarus, 103, 163-214, 1993.

Harrington, J., M.L. Cooke, W.J. Forrest, and J.L. Pipher, IRTF Observations of the Occultation of 28 Sgr by Saturn, Icarus, 103, 235-252, 1993.

Hubbard, W.B., B. Sicardy, R. Miles, A.J. Hollis, R.W. Forrest, I.K.M. Nicolson, G. Appleby, W. Beisker, C. Bittner, H.J. Bode, M. Bruns, H. Denzau, M. Nezel, E. Riedel, H. Struckmann, J.E. Arlot, F. Roques, F. S`evre, W. Thuillot, M. Hoffmann, E.H. Geyer, C. Buil, F. Colas, J. Lecacheux, A. Klotz, E. Thouvenot, J.L. Vidal, E. Carreira, F. Rossi, C. Blanco, S. Cristaldi, Y. Nevo, H.J.; Reitsema, N. Brosch, K. Cernis, K. Zdanavicius, L.H. Wasserman, D.M. Hunten, D. Gautier, E. Lellouch, R.V. Yelle, B. Rizk, F.M. Flasar, C.C. Porco, D. Toublanc, and G. Corugedo, The Occultation of 28Sgr by Titan, Astron. Astrophys. 269, 541, 1993

Hubbard, W.B., C.C. Porco, D.M. Hunten, G.H. Rieke, M.J. Rieke, D.W. McCarthy, V. Haemmerle, J. Haller, B. McLeod, L.A. Lebofsky, R. Marcialis, and J.B. Holberg, Structure of Saturn?s Mesosphere from the 28 Sgr Occultations, Icarus, 130, 404-425, 1997.

NICHOLSON, P.D., C.A. MCGHEE, and R.G. French, Saturn's central flash from the 3 July 1989 occultation of 28 Sgr., Icarus, 113, 57-83, 1995.

Nicholson, P.D., R.G. French, E. Tollestrop, and J.N. Cuzzi, Saturn's rings I. Optical depth profiles from the 28 Sgr occultation, Icarus 145, 474-501, 2000.