Kosmos 257 (Russian: Космос 257 meaning Cosmos 257), known before launch as DS-P1-Yu No.17, 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 1968 as part of the Dnepropetrovsk Sputnik programme.^[1] It had a mass of 325 kilograms (717 lb).^[1]

Kosmos 257 was launched from Site 133/1atPlesetsk,^[2] atop a Kosmos-2I 63SM carrier rocket. The launch occurred on 3 December 1968 at 14:52:21 UTC, and resulted in Kosmos 257's successful deployment into low Earth orbit.^[3] Upon reaching orbit, it was assigned its Kosmos designation, and received the International Designator 1968-107A.

Kosmos 257 was operated in an orbit with a perigee of 261 kilometres (162 mi), an apogee of 396 kilometres (246 mi), 70.9 degrees of inclination, and an orbital period of 91.10 minutes.^[1]^[4] It remained in orbit until it decayed and reentered the atmosphere on 5 March 1969.^[4] It was the seventeenth of seventy nine DS-P1-Yu satellites to be launched,^[1] and the sixteenth of seventy two to successfully reach orbit.^[5]

References[edit]

^ ^a ^b ^c ^d Wade, Mark. "DS-P1-Yu". Encyclopedia Astronautica. Archived from the original on 2 June 2012. Retrieved 11 August 2009.

^ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 11 August 2009.

^ Wade, Mark. "Kosmos 2". Encyclopedia Astronautica. Archived from the original on 18 June 2012. Retrieved 11 August 2009.

^ ^a ^b McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 11 August 2009.

^ Krebs, Gunter. "DS-P1-Yu (11F618)". Gunter's Space Page. Retrieved 11 August 2009.

Dnepropetrovsk Sputnik programme

DS-1

DS-2

Kosmos 1

DS-A1

Kosmos 11

Kosmos 17

Kosmos 53

Kosmos 70

DS-K

Kosmos 8

K-40 #1

K-40 #2

DS-MG

Kosmos 26

Kosmos 49

DS-MT

Kosmos 31

Kosmos 51

DS-MO

Kosmos 149

Kosmos 320

DS-P1

Test

Kosmos 6

Kosmos 19

Kosmos 25

P1-I

Kosmos 106

P1-M

P1-Yu

Kosmos 36

#23

#36

#39

#33

#51

#68

DS-U1

Kosmos 108

DS-U2

Kosmos 93

DS-U3

Kosmos 166

Kosmos 14

Kosmos 23

← 1967

Orbital launches in 1968

1969 →

Surveyor 7

E-6LS No.112

DS-U1-Ya No.1

7K-L1 No.7L

Nimbus B

SECOR 10

Sfera No.12L

Strela-2 No.3

Orbiscal 1

OV5-8

Gridsphere 1

Gridsphere 2

Gridsphere B

Gridsphere R

LCS-3

LIDOS

SECOR 11

SECOR 12

Radcat

P68-1

Intelsat III F-1

STV-1

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).

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