Title: "Herschel Mission Overview" Speaker: Dr. Stephan Ott Herschel Science Data Processing Development Manager European Space Agency Abstract: The Herschel Space Observatory is the next observatory mission in the European Space Agency (ESA) science programme. It will perform imaging photometry and spectroscopy in the far infrared and submillimetre part of the spectrum, covering approximately the 55-672 micron range. Herschel will carry a 3.5 metre diameter passively cooled telescope. The science payload complement - two cameras/medium resolution spectrometers (PACS and SPIRE) and a very high resolution heterodyne spectrometer (HIFI) - will be housed in a superfluid helium cryostat. The HIFI instrument is using superconducting SIS and HEB mixers, and both AOS and auto-correlator spectrometers. The ground segment will be jointly developed by the ESA, the three instrument teams, and NASA/IPAC. Once operational in orbit around L2 after a launch in 2008 and followed by an early operations period of 6 months, Herschel will offer a minimum of 3 years of routine science observations. The key science objectives emphasize current questions connected to the formation and evolution of galaxies, stars and stellar systems, including our own planetary system. Nominally ~20,000 hours will be available for astronomy, 32% is guaranteed time and the remainder is open to the general astronomical community through a standard competitive proposal procedure. The Key Programme AO was issued in Feb 2007, and both the guaranteed and open time accepted Key Programmes will be discussed, as well as future observing opportunities. The development of the Herschel Data Processing System started six years ago to support the data analysis for Instrument Level Tests. To fulfil the expectations of the astronomical community, additional resources were made available to implement a freely distributable user-friendly Data Processing System capable to interactively and automatically reduce Herschel data at different processing levels. We will summarise the current state of the Herschel Data Processing System.