A series of small NASA satellites that study the Sun, being deployed and retrieved by a space shuttle. Spartan 201-1 flew in April 1993, Spartan 201-2 in September 1994, Spartan 201-3 in September 1995, and Spartan 201-5 in November 1998. In November 1997, Spartan 201-4 failed to deploy. Each of the satellites uses telescopes to study the Sun's extremely hot corona and its expansion into the solar wind. The data provides new understanding about the source of energy that heats the corona and accelerates the solar wind particles.
Subjects: Astronomy and Astrophysics.