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SASSI2 [University Of Illinois, Urbana-Champaign]

The SASSI2 (Student Aerothermal Spectrometer Satellite of Illinois and Indiana) is a 3U CubeSat scientific investigation mission by the University Of Illinois, Urbana-Champaign, and, which will utilize optical instrumentation in conjunction with temperature and pressure measurements to improve models of thermochemical non-equilibrium and electronic excitation occurring in high enthalpy flows.

This mission will characterize the flow and radiation generated by the diffuse bow shock formed during high-speed flight through the upper atmosphere. Optical spectrographic measurements of the radiation will provide benchmark data for flow, radiation, and materials modeling, improving aerothermal reentry models. Improved modeling will enable reduction of current thermal protection system design margins, ultimately resulting in lower-mass, higher-reliability thermal protection systems.

The satellites payload consists of an optical spectrometer Payload (UIUC) and the Purdue Sensor Payload. It consists of following instruments:

  • Static and dynamic pressure measured by Patterson probe with a pirani gauge.
  • External temperatures measure using armored thermocouple.
  • Internal temperatures measured using silicon bandgap sensors.
  • Spectrographic intensity measure by Ocean Optics HR4000 using fiber cables.

The satellite was built for a deployment from the ISS. Magnetic rotors provide attitude control during gradual orbital decay and orient the CubeSat perpendicular to freestream near apogee. It retains orbital energy by maintaining orbital eccentricity. SASSI2 will record atmospheric data below 200 km.

It was selected in 2017 by NASA's CubeSat Launch Initiative (CSLI) to be launched as part of the ELaNa program. SASSI2 was launched with the Cygnus CRS-11 mission on an Antares-230 rocket, which deployed it directly from the launch vehicles stage 2 in a very low orbit.

Nation: USA
Type / Application: Science, atmosphere
Operator: University Of Illinois, Urbana-Champaign, Purdue University
Contractors: University Of Illinois, Urbana-Champaign, Purdue University
Equipment: Optical spectrometer Payload (UIUC), Purdue Sensor Payload
Configuration: CubeSat (3U)
Power: Solar cells, batteries
Mass: 4 kg
Orbit: 201 km × 291 x 51.6
Satellite COSPAR Date LS Launch Vehicle Remarks
SASSI2 2019-022# 17.04.2019 WI LC-0A Antares-230 with Cygnus CRS-11, VCC A, B, C, Bird JPN, Bird LKA, Bird NPL, IOD-GEMS, SpooQy 1, Światowid, KrakSat, AeroCube 10A, AeroCube 10B, Seeker, EntrySat, ThinSat 1A, ..., 1L

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