1. Mars Swingby (MSB) information
Rosetta Science Operations Centre (RSOC)
Detlef Koschny, Kristin Wirth, Rene Laureijs Viney Dhiri, Ruben Solaz
Introduction Schedule – highlights/details Geometry info ESA plans to provide Swingby events and geometry Currently known contraints Coordinated observations with Mars Express

2. Highlights of the schedule
Detailed schedule see following page
Highlights:
03 April 2006: Event info with geometrical info and all known constraints, RSOC -> PIs (*)
15 May 2006: Top-level science requests, PIs -> RSOC ( from HUK)
26 Jun 2006: Baseline attitude file and resources, RMOC -> RSOC, PIs
26 Jun 2006: Draft Master Science Plan (MSP), RSOC -> PIs
10 Jul 2006: Observation requests with detailed pointing, preliminary Input Timeline (ITL) files, PIs -> RSOC (formsheets, computer-readable files)
02 Oct 2006: Final updates to Rosetta database (RMIB) - formsheets
16 Oct 2006: Updated MSP, RSOC -> PIs
01 Jan 2007: Final Input Timelines (ITL), PIs -> RSOC
25 Jan 2007: Final go/no-go decision, PIs -> RSOC ( from HUK)
11 Feb – 12 Mar 2007: Execution of Mars Swingby operations (closest approach 25 Feb 2007, 01h56m

4. Geometry info ESA plans to provide on 03 Apr 2006
For each of the object Mars, Phobos, Deimos, Mars Express, plot as a function of time:
Distance to center
Longitude/latitude on surface (Mars only)
Phase angle (the angle Sun – object – Rosetta) of viewing direction
Solar elongation (the angle Sun – Rosetta – object) of viewing direction
Angle Mars – object – Rosetta (with object = Phobos or Deimos) – to judge whether we see ‘far side’ or ‘near side’
Provide info as plots and ASCII files
SPICE kernels (which should only be used for archiving) are available via anonymous ftp at gorilla.estec.esa.int, pub/projects/Rosetta/data/SPICE

5. Swingby events and geometry

6. Events Event file available on DDS – version is 0033.
Closest approach:
250 km height
2007/02/25 01:54: UTC (based on optimized orbit from 16 Dec 2005)

7. Flyby geometry Total of 4 hours, object starts at ‘dot’ To Sun Rosetta
Phobos
Deimos

11. Currently known constraints
No manoeuvres planned as of now
No special pointings planned as of now (RMOC currently does not plan to repeat any asteroid tracking tests)
Incoming trajectory: Sun-s/c-Mars angle is 165 deg, i.e. due to thermal constraints no Mars pointing
Rosetta will be in eclipse – most likely it will not be allowed any payload operations for safety reasons for a certain time around this
Outgoing trajectory: Sun-s/c-Mars angle (solar elongation) is 28 deg – no spacecraft problems, but straylight

12. Attitude constraints (thermal)

13. Data from Flight Dynamics file

14. Coordinated observations with Mars Express (MEX)?
Plasma environment measurements
Observe Mars surface objects to calibrate effect of atmosphere?
Simultaneous limb observations?
MEX plans Science Operations Working Group meeting in first week of April at EGU in Vienna -> possible coordination meeting, will be planned by Project Scientists
But note the constraints as given before…