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

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 (email 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 (email from HUK) 11 Feb – 12 Mar 2007: Execution of Mars Swingby operations (closest approach 25 Feb 2007, 01h56m

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

Swingby events and geometry

Events Event file available on DDS – version is 0033. Closest approach: 250 km height 2007/02/25 01:54:34.092 UTC (based on optimized orbit from 16 Dec 2005)

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

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

Attitude constraints (thermal)

Data from Flight Dynamics file

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…