In this talk, I will introduce infrared space missions at KASI. Based upon the previous heritages from FIMS and MIRIS project, KASI is being developed the Near-infrared Imaging Spectrometer for Star formation history (NISS) onboard NEXTSat-1. The NISS has a capability of imaging spectroscopy in the near-infrared by using the special spectral filters, LVFs (Linear Variable Filter). The main scientific targets are nearby galaxies, galaxy clusters, star-forming regions and low background regions. The off-axis optical design of the NISS with 15cm aperture was optimized to obtain a wide field of view (FoV) of 2 deg. × 2 deg. with a spatial resolution of 15 arcsec as well as a wide spectral coverage from 0.9 to 3.8μm. The opto-mechanical structure was designed to be safe enough to endure in both the launching and space environment. The NISS will be launched in 2017 and explore the large areal near-infrared sky up to 200 deg.² in order to get both spatial and spectral information for astronomical objects.

As an extension of the NISS, KASI is planning to participate in a new small space mission together with NASA. The promising candidate, SPHEREx (Spectro-Photometer for the History of the Universe Epoch of Reionization, and Ices Explorer) in Phase-A study is an all-sky spectral survey mission designed to reveal the origin of the Universe and water in the planetary systems and to explore the evolution of galaxies. The SPHEREx will perform the first near-infrared all-sky imaging spectroscopic survey with the wider spectral range from 0.7 to 5μm and the wider FoV of 3.5 deg. × 7 deg. (7 arcsec. resolution) like the similar survey concept of the NISS.