|Mission duration||Failed to orbit|
|Launch mass||16 kilograms (35 lb)|
|Dimensions||46 x 30cm (six-sided)|
|Start of mission|
|Launch date||December 21, 2004|
|Rocket||Delta IV Heavy|
|Launch site||Cape Canaveral SLC-37B|
Ralphie (or 3CS-2) was a satellite, part of the Three Corner Satellite (3CS) project, a three satellite (Sparkie, Ralphie, Petey) student research project. It was designed and built by mostly undergraduate students at the University of Colorado Boulder as part of the Air Force Research Laboratory's University Nanosat Program.
Ralphie was responsible for imaging and End-to-End Data Systems in the 3CS project.
The satellite carries the name of CU Boulder’s mascot, Ralphie.