Near-infrared spectra of liquid/solid acetylene under Titan relevant conditions and implications for Cassini/VIMS detections

•This is the first publication about the short-wavelength part of the spectrum of solid and liquid acetylene.•We observed variations of albedo and absorption bands between different phases.•The deepest acetylene band in the investigated wavelength range from 1.2 to 2.2μm lies within the atmospheric window at 1.6μm.