Two SKRL-756 spheres in payloadstack [kosmonavtika.com]
Official name COSMOS 2494 (SKRL 756)
Alternative name SKRL-756 No. 2
Cospar ID 2013-078B
Norad ID 39491
Launch date 2013-12-28
Launch site PKMTR
Launch vehicle Soyuz-2-1v Volga
Country/Organization Russia
Type application Calibration
RCS size MEDIUM
Decay date ON ORBIT
Period (min) 95.9
Inclination (deg) 82.41
Perigee (km) 549
Apogee (km) 575
Eccentricity 0.0231316725978648
Mean motion (revs. per day) 15.0156412930136
Semi-Major axis (km) 6940.135
Raan (deg) 270.0344
Arg of perigee (deg) 79.576
Shape Sphere
Mass (kg) 50
Height (m) 0.8
Width (m) 0.8
Depth (m) 0.8
Span (m^2) 0.8
Propulsion None

The two Russian SKRL-756 satellites are radar calibration spheres, which were launched on the maiden flight of the Soyuz-2-1v Volga launch vehicle.

The two spheres were side-mounted on a large cylindrical adaptor, which also carries the Aist-1 1 satellite on top.

Satellite COSPAR Date LS Launch Vehicle Remarks
COSMOS 2493 (SKRL 756) 2013-078A 2013-12-28 PKMTR Soyuz-2-1v Volga with Aist-1 1, Kosmos 2493 (SKRL-756 2), Ballast
COSMOS 2494 (SKRL 756) 2013-078B 2013-12-28 PKMTR Soyuz-2-1v Volga with Aist-1 1, Kosmos 2492 (SKRL-756 1), Ballast