ASE 379L Space Systems Engineering Fb February 4, Group 1: Johnny Sangree. Nimisha Mittal Zach Aitken

Transcription

1 Rosetta Mission Scope and CONOPS ASE 379L Space Systems Engineering Fb February 4, 2008 Group 1: Johnny Sangree Ankita Mh Maheshwarih Kevin Burnett Nimisha Mittal Zach Aitken 1

2 Need Statement To understand the origin of the Solar System by determining the composition of a comet through observation and experimentation 2

3 Mission Goal Directly examine and study comet 67P/ Churyumov Gerasimenko 3

4 Mission Objectives Map the surface of comet 67P Observe changes to the comet s surface while near perihelion Secondary objective: Perform a controlled landing on the comet surface Secondary objective: Image asteroids 21 Lutetia and 2867 Steins 4

5 Primary Mission Description Rosetta is an ESA mission that will rendezvous with the comet 67P/Churyumov Gerasimenko, and become the first spacecraft to execute a controlled landing on a comet. Rosetta has been equipped with eleven unique instrumental sets from multiple international institutes. Its primary objective is to map and characterize the nature of the comet's nucleus, and focuses on the period when the comet experiences increased activity due to the Sun at its perihelion point. Rosetta was launched aboard an Ariane V launch vehicle in March 2004, and is expected to reach the comet by May Its trajectory includes four gravity assists with planets Earth and Mars, and two asteroid flybys. Upon reaching the comet, the lander, Philae, will detach fromtheorbiter orbiter anddescend descend onthecomet surface to perform its scientific functions. The observations from both the lander and the orbiter will be relayed back to the Rosetta Science Operations Centre in Darmstadt, Germany, where the data will be pre processed p and made available to the scientific community. 5

6 Assumptions The orbit trajectories will be sufficiently accurate for Rosetta to rendezvous with the comet. The technology is advanced enough to engineer a vehicle capable of landing on a comet. The Ariane 5 Launch Vehicle will be capable of launching the mass and volume of the Rosetta satellite into the correct orbit. ESA will continually be able to fund and manage the mission throughout h the project life. The Rosetta spacecraft will be ready to launch in time to rendezvous withthe the comet. 6

7 Authority and Responsibility The full operational responsibility for the Rosetta mission belongs to the European Space Agency (ESA). The Operations Control Centre (OCC) for Rosetta is located at the European Space Operations Centre (ESOC) in Darmstadt and uses a ground station in Perth, Australia. The Lander Control Centre is at DLR in Cologne, Germany. The main body of the spacecraft has been contracted to Astrium Germany. Astrium UK has prime responsibility for the spacecraft platform, Astrium France for the spacecraft avionics, and Alenia Spazio for the final assembly, integration and verification stages. The 11 different experiments on the orbiter were brought in from different institutes across Europe and the United States. 7

8 Constraints Must launch in February 2004 to rendezvous with comet 67 P/Churyumov Gerasimenko Budget constraint of 1000 million Euros The spacecraft trajectory must use gravity assists since direct rendezvous with ihthe comet using only propulsive maneuvers is not possible with ihcurrent technology 8

9 Concept of Operations (CONOPS) Launch T = T 1 Earth Mars Earth Gravity Assist T 2 = T year Asteroid Steins Flyby T 3 = T years & 7 months Earth Gravity Assist T 4 = T year & 2 months Asteroid Lutetia Flyby T 5 = T months Comet 67P Rendezvous T 6 = T years & 10 months Comet Mapping T 7 = T months Lander Separation T 8 = T months Lander Science Phase and End of Mission 9 T 9 = T year

10 CONOPS Narrative The Rosetta mission will begin with a launch aboard an Ariane 5 G+ rocket on 2 March 2004 from Kourou, French Guiana. The spacecraft next will perform gravity assist flybys of Earth, Mars, and Earth again. A flyby of Asteroid 21 Steins is scheduled for 5 September, Rosetta will then perform an additional gravity assist using Earth, before a flyby of Asteroid 2867 Steins. The spacecraft will rendezvous and orbit the comet 67P/Churyumov Gerasimenko in May, For three months, Rosetta will map the surface of the comet using multiple scientific instruments. In November of 2014, the lander, Philae, will separate from the orbiter and descend to the surface of the comet. For a period of one year, until mission termination, the lander will gather scientific data and relay the information to the orbiting Rosetta spacecraft, which will forward the data to the distributed Deep Space Network. 10