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How to scan the whole sky

MAXI/Gas Slit Camera has two strip-shaped fields of view, which are about 90 degrees away from each other. The size of each field of view is 1 degree by 160 degrees. Each field of view scans the whole sky as the International Space Station (ISS) goes round the Earth once every 90

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How to scan the whole sky

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  1. MAXI/Gas Slit Camera has two strip-shaped fields of view, which are about 90 degrees away from each other. The size of each field of view is 1 degree by 160 degrees. Each field of view scans the whole sky as the International Space Station (ISS) goes round the Earth once every 90 minutes. In some high-background regions along the ISS orbit, the X-ray cameras have to be turned off. With this restriction , we are still able to cover the whole sky thanks to two fields of view looking at different directions. MAXI/Solid-state Slit Camera has similar but smaller fields of view. How to scan the whole sky Scan direction X-ray Calibration Facility for MAXI at NASDA/Tsukuba Space Center In 1998, we started to construct a laboratory to test and calibrate MAXI X-ray cameras and their electronics. Now we have a 18- meter X-ray beam line, From the other side where an X-ray generator is set. The 18-meter X-ray beam line viewed from the side where X-ray cameras are set. a couple of vacuum chambers, a cooling system for CCD cameras, and data acquisition systems using workstations, NIM modules, and VME bus modules. At the moment, NASDA postdocsand university students are conducting experiments for X-ray CCDs and a radiation belt monitor. From a technical point of view, MAXI will be a precursor to the future space missions in which many CCD chips should be cooled and operated simultaneously. Several issues: something new to the MAXI mission team Our mission members have good experience in space missions, but only in developing unmanned free-flyers for astronomy. In designing MAXI, we are paying much attention to hazards, contamination, short-term variability in thermal environment, a limited sky coverage free from the ISS structure. GSC Zenith Field of View GSC Forward Field of View The baffle for the star sensor (Blue line) (Blue line) Earth We are exchanging information about hazzards such as knife edges with NASA well in advance to the safety review. Red: Wiped by rotating solar paddles Grey: The ISS structure Contact person: Shiro Ueno at ueno.shiro@nasda.go.jp 28 June 2000

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