Spire Lemur-2

Spire Lemur-2 (Low Earth Multi-Use Receiver) is a commercial constellation of 3U CubeSats designed, built, and operated by Spire Global. WMO OSCAR records the programme lifetime as 2015-2040 with individual satellite design lives of 2 years, while NASA CSDA lists 3 years for Spire commercial data spacecraft. The constellation flies at variable orbit heights between 400 and 600 km depending on launch opportunity, with a representative 550 km sun-synchronous altitude on the WMO Lemur-2 satellite record. The programme carries three payload types across the constellation: the STRATOS GNSS radio-occultation receiver for atmospheric temperature and humidity profiling, a passive AIS receiver (SENSE) for vessel tracking, and an ADS-B receiver (AirSafe) for aircraft tracking; payload fit varies by flight unit. NASA CSDA identifies Spire as operating over 100 LEMUR satellites collecting RF signals from LEO, with WMO OSCAR recording a constellation capacity of up to 175 flight units.^[1] The constellation supplies commercial weather and RF-sensing data and provides maritime and aviation domain awareness services globally. ^{[2][1][3][4][5][6]}