University of Colorado Boulder (Laboratory for Atmospheric and Space Physics)
Launch mass
120 kg (260 lb) [1]
Dimensions
0.9 × 1.0 m (2 ft 11 in × 3 ft 3 in)
Power
37 watts
Start of mission
Launch date
26 February 1998, 07:07 UTC
Rocket
Pegasus XL HAPS (F20)
Launch site
Vandenberg, (Stargazer)
Contractor
Orbital Sciences Corporation
Entered service
11 March 1998 [2]
End of mission
Last contact
13 December 2003
Decay date
13 December 2003, 09:34 UTC [3]
Orbital parameters
Reference system
Geocentric orbit[4]
Regime
Sun-synchronous orbit
Perigee altitude
535 km (332 mi)
Apogee altitude
580 km (360 mi)
Inclination
97.70°
Period
95.80 minutes
Instruments
Auroral Photometer (AP) Solar X-ray Photometer (SXP) Ultraviolet Spectrometer (UVS)
Student Nitric Oxide Explorer mission patch
Explorer program
← Advanced Composition Explorer (Explorer 71)
Transition Region and Coronal Explorer (Explorer 73) →
Student Nitric Oxide Explorer (SNOE ("snowy"), also known as Explorer 72, STEDI-1 and UNEX-1), was a NASA small scientific satellite which studied the concentration of nitric oxide in the thermosphere. It was launched in 1998 as part of NASA's Explorer program. The satellite was the first of three missions developed within the Student Explorer Demonstration Initiative (STEDI) program funded by the NASA and managed by the Universities Space Research Association (USRA). STEDI was a pilot program to demonstrate that high-quality space science can be carried out with small, low-cost (<US$4.4 million) free-flying satellites on a time scale of two years from go-ahead to launch.[5] The satellite was developed by the University of Colorado Boulder's Laboratory for Atmospheric and Space Physics (LASP) and had met its goals by the time its mission ended with reentry in December 2003.
^Solomon, Stanley C.; Bailey, Scott M.; Barth, Charles A.; Davis, Randal L.; Donnelly, John A.; et al. (1998). The SNOE Spacecraft: Integration, Test, Launch, Operation, and On-orbit Performance(PDF). 12th AIAA/USU Conference on Small Satellites 1998 Logan, Utah.
^Bailey, Scott M.; Woods, T. N.; Barth, C. A.; et al. (December 2000). "Measurements of the solar soft X-ray irradiance by the Student Nitric Oxide Explorer: First analysis and underflight calibrations". Journal of Geophysical Research. 105 (A12): 27179–27194. Bibcode:2000JGR...10527179B. doi:10.1029/2000JA000188. S2CID 121207264.
^"SNOE". Encyclopedia Astronautica. Archived from the original on 28 December 2016. Retrieved 26 March 2017.
^Cite error: The named reference Trajectory was invoked but never defined (see the help page).
^"Display: SNOE (Explorer 72) 1998-012A". NASA. 28 October 2021. Retrieved 29 November 2021. This article incorporates text from this source, which is in the public domain.
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Global Information
This article incorporates text from this source, which is in the public domain.
