|Mission type||ABM radar target|
|Launch mass||325 kilograms (717 lb)|
|Start of mission|
|Launch date||8 July 1966, 05:31UTC|
|Launch site||Kapustin Yar 86/1|
|End of mission|
|Decay date||10 December 1966|
|Perigee||253 kilometres (157 mi)|
|Apogee||490 kilometres (300 mi)|
Kosmos 123 (Russian: Космос 123 meaning Cosmos 123), also known as DS-P1-Yu No.5 was a Soviet satellite which was used as a radar calibration target for tests of anti-ballistic missiles. It was built by the Yuzhnoye Design Bureau, and launched in 1966 as part of the Dnepropetrovsk Sputnik programme.
Kosmos 123 separated from the carrier rocket into a low Earth orbit with an apogee of 490 kilometres (300 mi), a perigee of 253 kilometres (157 mi), 48.7 degrees of inclination, and an orbital period of 91.97 minutes. It decayed from orbit on 10 December 1966. Kosmos 123 was the sixth of seventy nine DS-P1-Yu satellites to be launched, and the fifth of seventy two to successfully reach orbit.
- Krebs, Gunter. "DS-P1-Yu (11F618)". Gunter's Space Page. Retrieved 9 August 2009.
- Wade, Mark. "DS-P1-Yu". Encyclopedia Astronautica. Retrieved 9 August 2009.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 9 August 2009.
- Wade, Mark. "Kosmos 2". Encyclopedia Astronautica. Retrieved 9 August 2009.
- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 9 August 2009.
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