The   United States’ Space Force 18th Space Squadron has listed approximately 274   objects in low earth orbit (LEO) that remain unidentified. Characterisation   of these objects, particularly in terms of size and mass, is an important   consideration for space situational awareness as it enables increased   accuracy for conjunction assessments. Additionally, attribution of unknown   objects to a specific owner is critical to determining responsibility for   future debris removal or adverse outcomes caused by an object both on-orbit   and during orbital decay. The authors present a novel method for identifying   and characterising resident space objects utilising a space-to-space flyby   imaging platform implemented by HEO Robotics. Space-based sensors enable   higher resolution, when compared with ground-based observation methods and   subsequently are better suited for characterisation and feature   identification. The effectiveness of this approach is demonstrated through an   investigation into Object K (NORAD ID: 48257). Object K is an object that   originated from a known Chinese launch that has generated interest in the   space domain awareness community due to an absence of information regarding   its characteristics. This paper presents the analysis of images captured by   HEO Robotics space-based sensors, as well as subsequent simulations, enabling   the object to be identified as a Long March 6 rocket payload fairing.