Jan 24

Could someone please help me solving this question?

“The IRAS instrument has a field of view of 1 degree. What is the minimum time it takes IRAS to map the total sky, neglecting the yearly variation of the angle between sun vector and equatorial plane?”

one comment so far...

  • suitti Said on January 24th, 2010 at 2:59 pm:

    IRAS ran from 1975 to 1983. It covered 96% of the sky. That suggests that if they had just 4 more months, they’d have gotten it covered.

    I realize that i haven’t answered your question. But you’d have had to supply the amount of time that it took for data taking somehow. It didn’t image, so perhaps it swept the sky like HIPPARCOS. It sounds like a spherical math problem, but without enough parameters.

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