DASH (short for Density And Scale Height) were a pair of 2.5 meter balloon satellites launched in 1963. They were designed to measure air density at very high altitude, but their orbit was significantly affected by solar radiation pressure.[1]
References
^Krebs, Gunter D. "DASH 1, 2". Gunter's Space Page. Retrieved 2 November 2021.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).