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Hubble Revitalised <br>Service Mission Observatory Verification

Hubble Revitalised
Service Mission Observatory Verification

Antonella Nota (ESA Hubble Mission Manager and Project Scientist) and Danny Lennon (Deputy Head of the Instrument Division) describe briefly the activities that will be performed at STScI as the Hubble Space Telescope is prepared for science operations.

The crew of STS 125 who carried out SM4. Credit: NASA

The success of the recent servicing mission to Hubble (SM4) is due to the seven astronauts who so superbly completed the five-EVA mission, and to a cast of thousands involved in ground support, planning and training. The Space Telescope Science Institute (STScI) in Baltimore played a part during SM4 by supporting crucial tests which were initiated immediately following the installation or repair of an instrument. The Aliveness Test (AT) confirmed that critical components such as power supplies were working, while the Functional Test (FT) exercised mechanisms such as filter wheels, and performed some simple internal calibration observations to ensure that the basic functions of the instrument were in order. Scientists and engineers from STScI, the Goddard Space Flight Center (GSFC), and from Instrument Development teams, were central to assessing whether or not an instrument passed the crucial FT, a benchmark against which the success of the mission was measured.  Fortunately, everything in SM4 passed with flying colours!

However Hubble is not yet ready for science, rather we are at the beginning of a detailed and thorough commissioning phase termed Servicing Mission Observatory Verification (SMOV) which will last for approximately four months. This phase is led by STScI and involves a detailed assessment of Hubble to ensure that the telescope, its instruments, and infrastructure are indeed working to specifications and are fit for scientific purpose.

During SMOV a complex and comprehensive range of tasks is performed ranging from monitoring the thermal environment of the telescope to extremely detailed analysis of calibration data. Each instrument and sub-system has a pre-planned sequence of activities tailored to the commissioning requirements of the instrument in question. Each activity is led by a scientist or engineer at STScI or GSFC, and coordinated by the instrument Team Lead or Technical Lead at STScI.

As an example, a typical sequence of SMOV activities for the Space Telescope Imaging Spectrograph (STIS) would include engineering tests (mechanism, calibration lamp, electronics and aperture wheel), alignment and focus checks, and then for each detector (STIS has three; a CCD, a far-UV MAMA and a near-UV MAMA) a series of tests of the detector properties, optical format, image quality and throughput.

The SMOV programme will be completed in 16 weeks. As each activity is completed, the results are transferred to STScI for verification. Data are archived, processed and are made available to the analysis teams at STScI for immediate investigation. SMOV meetings are held each morning to review progress and discuss issues or potential problems based on input from the analysis teams from the previous day. As we move through SMOV we subject each instrument on Hubble to an exhaustive health check prior to giving it the green light for science, and re-establishing Hubble as the foremost observatory at our disposal.

Written by:
Antonella Nota and Danny Lennon
Space Telescope Science Institute, Baltimore, USA
2 June 2009

Last Update: 1 September 2019
5-Dec-2020 12:25 UT

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