Development status and performance estimation of MAXI

Shiro Ueno, Hiroshi Tomida, Naoki Isobe, Haruyoshi Katayama, Kazuyoshi Kawasaki, Takao Yokota, Naoyuki Kuramata, Masaru Matsuoka, Tatehiro Mihara, Ikuya Sakurai, Motoki Nakajima, Mitsuhiro Kohama, Hiroshi Tsunemi, Emi Miyata, Nobuyuki Kawai, Jun Kataoka, Yuuri Serino, Yoshihisa Yamamoto, Atsumasa Yoshida, Hitoshi Negor

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)


Monitor of All-sky X-ray Image (MAXI) is an X-ray all-sky monitor, which will be delivered to the International Space Station (ISS) in 2008, to scan almost the whole sky once every 96 minutes for a mission life of two years. The detection sensitivity will be 7 mCrab (5σ level) in one scan, and 1 mCrab for one-week accumulation. At previous SPIE meetings, we presented the development status of the MAXI payload, in particular its X-ray detectors. In this paper, we present the whole picture of the MAXI system, including the downlink path and the MAXI ground system. We also examine the MAXI system components other than X-ray detectors from the point of view of the overall performance of the mission. The engineering model test of the MAXI X-ray slit collimator shows that we can achieve the position determination accuracy of <0.1 degrees, required for the ease of follow-up observations. Assessing the downlink paths, we currently estimates that the MAXI ground system receive more than 50% of the observational data in "real time" (with time delay of a few to ten seconds), and the rest of data with delay of 20 minutes to a few hours from detection, depending on the timing of downlink. The data will be processed in easily-utilised formats, and made open to public users through the Internet.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsG. Hasinger, M.J.L. Turner
Number of pages12
EditionPART 1
Publication statusPublished - 2004
Externally publishedYes
EventUV and Gamma-Ray Space Telescope Systems - Glasgow, United Kingdom
Duration: 2004 Jun 212004 Jun 24


OtherUV and Gamma-Ray Space Telescope Systems
CountryUnited Kingdom



  • All-sky X-ray Monitor
  • ISS
  • JEM
  • Kibo
  • MAXI
  • X-ray Astronomy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Ueno, S., Tomida, H., Isobe, N., Katayama, H., Kawasaki, K., Yokota, T., Kuramata, N., Matsuoka, M., Mihara, T., Sakurai, I., Nakajima, M., Kohama, M., Tsunemi, H., Miyata, E., Kawai, N., Kataoka, J., Serino, Y., Yamamoto, Y., Yoshida, A., & Negor, H. (2004). Development status and performance estimation of MAXI. In G. Hasinger, & M. J. L. Turner (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (PART 1 ed., Vol. 5488, pp. 197-208)