3150 20180912155342.0 10.1364/AO.56.002771 DOI SCART-2017-0028 Patel, Manish R. NOMAD spectrometer on the ExoMars trace gas orbiter mission: part 2—design, manufacturing, and testing of the ultraviolet and visible channel 2017 NOMAD is a spectrometer suite on board the ESA/Roscosmos ExoMars Trace Gas Orbiter, which launched in March 2016. NOMAD consists of two infrared channels and one ultraviolet and visible channel, allowing the instrument to perform observations quasi-constantly, by taking nadir measurements at the day- and night-side, and during solar occultations. Here, in part 2 of a linked study, we describe the design, manufacturing, and testing of the ultraviolet and visible spectrometer channel called UVIS. We focus upon the optical design and working principle where two telescopes are coupled to a single grating spectrometer using a selector mechanism. STCE Antoine, Philippe Mason, Jonathon Leese, Mark Hathi, Brijen Stevens, Adam H. Dawson, Daniel Gow, Jason Ringrose, Timothy Holmes, James Lewis, Stephen R. Beghuin, Didier Van Donink, Philip Ligot, renaud Dewandel, Jean-Luc Hu, Daohua Bates, Doug Cole, Richard Drummond, Rachel Thomas, Ian R. Depiesse, Cédric Neefs, Eddy Equeter, Eddy Ristic, Bojan Berkenbosch, Sophie Bolsée, david Willame, Yannick Vandaele, Ann Carine Lesschaeve, Stephan De Vos, Lieve Van Vooren, Nico Thibert, Tanguy Mazy, Emmanuel Rodriguez-Gomez, Julio Moraes, Rafael Candini, Gian Paulo Pastor-Morales, M. Carmen Sanz, Rosario Aparicio Del Moral, Beatriz Jeronimo-Zafra, José-Maria Gómez-López, Juan Manuel Alonso-Rodrigo, Gustavo Pérez-Grande, Isabel Cubas, Javier Gomez-Sanjuan, Alejandro M. Navarro-Medina, Fermín BenMoussa, Ali Giordanengo, Boris Gissot, Samuel Belluci, Giancarlo Lopez-Moreno, Jose Juan Applied Optics 56 10 2771-2782 boris.giordanengo@observatoire.be https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-10-2771 http://mars.aeronomie.be/multimedia/pdf/Neefs_15.pdf published in REFERD