Helene resides in the leading Lagrangian point L4 of Dione.
Helene has dimensions of 43.4x38.2x26 km with a period of revolution of 2.736915 days. Planned flybys span the mission with close approaches on Nov 4, 2008, Mar 3, 2010 and Jun 18, 2011.
See Small Satellites Events
) observing log including range, flyby velocity and phase
For observation times and instruments compare Small Satellites Events file with
were made by:
- Composite Infrared Spectrometer
- Imaging Science Subsystem
- Ultraviolet Imaging Spectrograph
- Visual and Infrared Mapping Spectrometer