We have a plan to a radioastronomy mission at the Moon. This is dedicated to the mapping of cosmic background anisotropy in order to study the properties of the early universe, especially galaxy formation. This is a candidate for the Moon mission of NASDA by an HIIA Rocket. The mission carries an 1.5m offset parabola antenna with radiation shield to the high latitude area of the Moon. This telescope has HEMT differential radiometers which are cooled to 40 K by a mechanical refrigerator. This will be observe at three frequencies between 30 to 90 GHz. Three frequencies is required to remove the Galactic foreground. The angular resolutions are 10' at the highest frequency, which is 2 order better than COBE-DMR. The telescope will observe the sky between 5 to 30 degree (not fixed) from the Moon celestial pole by combination of telescope scan and Moon rotation. The resultant sensitivity will reach several 10-6 K in 0.5 x 0.5 degree2 pixel.
IAU Joint Discussion
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