urn:jaxa:darts:context:instrument:vco.ir2 1.0 1.18.0.0 Product_Context ir2 IR2 2022-11-10 1.0 Initial version. urn:jaxa:darts:context:instrument_host:spacecraft.vco instrument_to_instrument_host 10.1186/s40623-016-0451-z Satoh, T. M. Nakamura, M. Ueno, K. Uemizu, M. Suzuki, T. Imamura, Y. Kasaba, S. Yoshida, and M. Kimata, Development and in-flight calibration of IR2: 2-um camera onboard Japan's Venus orbiter, Akatsuki, Earth, Planets and Space, 68, 74, 2016. The IR2 instrument paper. 2-micron Camera Camera Imager -5300 IR2, the 2-micron camera, is intended to study the meteorology of Venus by utilizing near-infrared (NIR) windows of the CO2 atmosphere. Contrast features at 1.74 and 2.3 micron on the night-side disk are the silhouette of spatially inhomogeneous scatterers/absorbers, back-illuminated by the glow of the hot (300-500 K) lower atmosphere. A channel centered at 2.02 micron, which contains a CO2 absorption feature, allows the determination of cloud top altitude by measuring reflected sunlight on the dayside. IR2, one of the key instruments onboard Akatsuki, is intended to image Venus in these NIR windows.