LEMUR-2-RUAIRI-EILIDH, also known as Lemur-2-Ruairi-Elidh, is a 3U CubeSat satellite launched on January 24, 2021, from the Air Force Eastern Test Range (AFETR) using a Falcon 9 launch vehicle. It was manufactured by SPIREG and owned by Spire. The satellite measures 0.3 meters in length with a diameter of 0.1 meters and spans 0.3 meters. It has a dry mass of 4.6 kilograms, which is also its launch mass. Equipped with solar cells and batteries for power supply, it features a GPS radio occultation payload (STRATOS), an AIS-receiver (SENSE), and ASD-B payloads. Its shape is described as "Box+2 pan," and it was launched on the same day it became stable. The satellite's mission details are not specified in the provided data.