Spar Assembly, ATM, Backup


Display Status:

This object is on display in the Space Science exhibition at the Steven F. Udvar-Hazy Center in Chantilly, VA.

Collection Item Summary:

This is a backup for the instrument spar for the Apollo Telescope Mount used on the Skylab manned space observatory. That assembly consisted of a 4-meter (14-foot) Sun shield, a scientific instrument canister, and an internal spar assembly that held the major instruments within the canister.

NASA's Marshall Space Flight Center designed and constructed the telescope mount and in 1982 transferred the backup instrument canister, Sun shield, and spar assembly to the Smithsonian. The sunward part of the canister and the Sun shield were reassembled and displayed in the National Air and Space Museum's Stars gallery.

Collection Item Long Description:

Inventory Number


Credit Line

Transferred from the National Aeronautics and Space Administration

Country of Origin

United States of America


Aluminized Kapton, Mylar (Polyester), Aluminum, Steel, Plastic, Stainless Steel, Velcro, Adhesive, Phenolic Resin, Synthetic Fabric, Epoxy, Glass, Rubber (Silicone)


  • 3-D (Weight is APPROXIMATE): 243.8 × 426.7cm, 1360.8kg (96 in. × 14 ft., 3000lb.)
  • Storage (Crate): 242.6 × 340.4 × 264.2cm (95 1/2 in. × 11 ft. 2 in. × 104 in.)

Data Source

National Air and Space Museum

Restrictions & Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum


SPACECRAFT-Manned-Life Support