Progress 7 deployed the KRT-10 astronomy satellite. The orbit of Exosat was different from any previous X-ray astronomy satellite. Lewin was co-investigator on the Small Astronomy Satellite 3 (SAS-3) project. Astrosat is India's first multi wavelength space observatory and full-fledged astronomy satellite. It was eventually assigned to STS-51-L, which was to also carry the SPARTAN-Halley astronomy satellite. The Submillimeter Wave Astronomy Satellite mission was approved on April 1, 1989. The first infrared astronomy satellite, IRAS, is launched. Cen X-4 and Apl X-1 were discovered by Hakucho, Japan's first X-ray astronomy satellite. MeV. Hakucho was Japan's first X-ray astronomy satellite. Tenma was the second Japanese X-ray astronomy satellite launched on Feb 20 1983. Tenma was the second Japanese X-ray astronomy satellite launched on February 20, 1983. The 1,360 kg X-ray astronomy satellite experiment was designed to look for soft galactic x-rays.