Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.



OTB-1 (Orbital Test Bed 1) is a small satellite operated by General Atomics Electromagnetic Systems Group (GA-EMS) to host several experiments from different customers.

Surrey Satellite Technology Ltd (SSTL) plans to fly a dedicated satellite for hosted payloads in 2015. This OTB (Orbital Test Bed) satellite provides the opportunity for Hosted Payload customers to benefit from reliable, low-risk access to orbit, to rapidly and cost-effectively space-qualify new technology, gain flight heritage, acquire mission experience, generate in-orbit data and provide mission continuity capability, without the need to procure a costly dedicated launch. In 2017, the asstes of SSTL-US, including the OTB-1 mission, were acquired by General Atomics Electromagnetic Systems Group (GA-EMS).

OTB 1 is based on the SSTL-150 bus and The mission is planned to last five years.

One of the hosted payloads is NASA's DSAC (Deep Space Atomic Clock), a technology demonstration mission with the goal to validate a miniaturized, ultra-precise mercury-ion atomic clock that is 100 times more stable than today’s best navigation clocks.

Also on board is a small capsule with cremated human remains for Celestis, called "Heritage Flight".

A second mission called OTB 2 is planned for 2022.

Nation: USA
Type / Application: Technology
Operator: General Atomics Electromagnetic Systems Group (GA-EMS)
Contractors: SSTL
Configuration: SSTL-150
Power: 4 deployable fixed solar arrays, batteries
Lifetime: 5 years
Mass: 138 kg
Orbit: 706 km × 723 km, 24.00°
Satellite COSPAR Date LS Launch Vehicle Remarks
OTB 1 2019-036C 25.06.2019 CCK LC-39A Falcon-Heavy (Block 5) with DSX , FORMOSAT 7A, 7B, 7C, 7D, 7E, 7F, GPIM, NPSat 1, Oculus-ASR, Prox 1, LightSail 2, ARMADILLO, FalconSat 7, E-TBEx A, E-TBEx B, PSat 2, BRICSat 2, Prometheus 2.6, Prometheus Mass Model, TEPCE 1, 2, CP 9 (LEO), StangSat
Further OTB missions:

Cite this page: