CASSIOPE

CASSIOPE (Cascade, Smallsat and Ionospheric Polar Explorer) is a Canadian scientific and technology demonstration satellite operated by the University of Calgary. Assigned NORAD catalog ID 39265 and international designator 2013-055A, it was launched on September 28, 2013 and remains in orbit today. Weighing approximately 500 kg, CASSIOPE occupies a notably elliptical low Earth orbit and holds a distinctive place in the history of Canadian spaceflight as the country's first hybrid satellite designed to simultaneously pursue both telecommunications research and space science objectives.

Mission and Purpose

At its core, CASSIOPE was conceived to address two separate but complementary goals: advancing the scientific understanding of space weather and demonstrating next-generation high-speed data communications technology in a real orbital environment.

The space weather component focuses on the polar ionosphere — the electrically charged upper layer of Earth's atmosphere where solar activity can produce dramatic and consequential effects. Charged particles streaming from the Sun interact with Earth's magnetosphere and ionosphere most intensely near the polar regions, producing phenomena such as auroras but also causing disruptions to radio communications, GPS navigation, and power grid infrastructure on the ground. By flying through this dynamic environment at high inclination, CASSIOPE's scientific instruments gather in-situ measurements of plasma density, electric and magnetic fields, and energetic particles. This data contributes to the broader global effort to characterize, model, and ultimately forecast space weather events — a field of growing practical importance as society becomes increasingly dependent on satellite-based services and other technologies vulnerable to solar disturbances.

The communications demonstration aspect of the mission involved testing advanced digital storage and forward concepts. Rather than transmitting data in real time, the satellite could receive large data packages from a transmitting ground station, store them aboard, and then relay them to a receiving station elsewhere — a mode sometimes compared to a "bent-pipe" courier in space. This technique is particularly relevant for high-latitude regions like Canada's Arctic, where continuous ground-station coverage is difficult to maintain and conventional geostationary communication satellites offer poor service.

The mission's development and initial operations were supported through funding from the Canadian Space Agency (CSA) and the Technology Partnerships Canada program. This backing sustained the mission from launch through February 2018, after which CASSIOPE's scientific role expanded considerably when it was incorporated into the European Space Agency's Swarm constellation through that agency's Third-Party Mission Program. Under this arrangement, CASSIOPE became known as Swarm Echo, or Swarm-E, complementing the three dedicated ESA Swarm satellites already studying Earth's magnetic field. This integration reflected international recognition of CASSIOPE's ongoing scientific value and extended its productive lifespan well beyond its original operational timeline.

Orbit and Tracking

CASSIOPE travels in a low Earth orbit with a high degree of ellipticity, giving it an apogee of 704 km and a perigee of 294 km. This range means the satellite swings between a relatively low point — where atmospheric drag is more noticeable and interactions with the denser lower ionosphere can be studied — and a substantially higher point where upper ionospheric and magnetospheric measurements become more accessible. The elliptical profile is not incidental; it is scientifically deliberate, allowing instruments to sample conditions across a vertical slice of the near-Earth space environment on every pass.

The orbital inclination of 80.9° places CASSIOPE in a near-polar orbit, meaning its ground track sweeps across high-latitude regions on virtually every revolution. This is essential for a mission centered on polar ionospheric research, since the phenomena of greatest interest — polar plasma jets, auroral particle precipitation, field-aligned currents — are concentrated at high latitudes. With each orbit lasting approximately 94.5 minutes, CASSIOPE completes roughly fifteen full revolutions around Earth per day, building up a dense and globally distributed dataset over time.

From a tracking perspective, the combination of high inclination and low perigee altitude makes CASSIOPE visible from a wide range of latitudes, including well into the polar regions. Its orbital parameters are maintained in the public catalog under NORAD ID 39265, and its position can be computed and tracked using standard two-line element (TLE) sets distributed through space surveillance networks. Because its perigee dips to 294 km, long-term orbital decay due to atmospheric drag is a factor that mission operators and trackers must account for, though as of the time of this writing the satellite remains in orbit.

Design and Operator

CASSIOPE was manufactured by MDA Space, a Canadian aerospace company with extensive heritage in satellite systems. The satellite has a mass of approximately 500 kg, placing it in the smallsat category — compact enough to enable a relatively affordable and flexible mission, but substantial enough to accommodate multiple instrument suites and the engineering redundancy expected of a long-duration science mission.

The University of Calgary serves as the operating authority for the mission. University-operated satellites of this scale are comparatively rare, and CASSIOPE's arrangement underscores the depth of expertise within Canadian academic space research communities. The university's role in operations gave researchers close operational ties to the satellite, facilitating the kind of responsive, science-driven commanding that maximizes the return from a mission of this type.

As a hybrid satellite, CASSIOPE carried two distinct payload suites working in parallel. The scientific instruments, collectively oriented toward ionospheric and space weather measurements, shared the platform with the communications technology payload. Engineering a single satellite bus to accommodate the thermal, power, data handling, and interference requirements of two functionally different payload groups represents a meaningful systems integration challenge — one that MDA Space and the mission team addressed in producing a platform that has operated across a timeline extending well beyond a decade.

The satellite was lofted into orbit aboard the first operational flight of the SpaceX Falcon 9 v1.1 launch vehicle, marking a notable moment in commercial launch history as well as in Canadian spaceflight. That particular mission was a landmark for SpaceX as it demonstrated an upgraded and more capable version of its Falcon 9 rocket, and CASSIOPE served as the primary payload for that debut flight.

Significance and Current Status

CASSIOPE occupies a meaningful position in several overlapping histories. For Canada, it represented the first satellite designed from the outset to carry a hybrid dual mission — a commercial-communication demonstration and a fundamental science investigation sharing a single platform. This approach anticipated a model that has since become more common in the smallsat and commercial new-space industries, where mission consolidation reduces cost per objective.

For the study of the polar ionosphere and space weather, CASSIOPE has contributed years of continuous, high-quality in-situ measurements from a region of space that is scientifically rich but logistically difficult to sample consistently. Ground-based instruments, such as radar networks and magnetometer chains, provide complementary observations, but a satellite that regularly passes through the polar ionosphere at low altitudes can measure quantities that are simply inaccessible from the surface.

The satellite's integration into ESA's Swarm program as Swarm-E from February 2018 onward formalized what had already been an internationally relevant dataset. The Swarm constellation is one of the flagship Earth observation programs of the ESA, dedicated to high-precision mapping of Earth's magnetic field and its interactions with the ionosphere and broader space environment. By flying in coordination with the dedicated Swarm satellites, CASSIOPE's instruments can provide additional spatial context, enabling multi-point measurements that single-satellite missions cannot achieve.

More than a decade after launch, CASSIOPE continues to orbit Earth, and its data remain part of active scientific investigations. The mission's longevity reflects sound engineering, thoughtful orbital design, and the sustained scientific demand for the kind of measurements it provides. Whether the satellite's mission status has been formally extended, curtailed, or is operating in some modified capacity is not publicly detailed in the current catalog record, but its continued presence in orbit attests to an operational lifespan well beyond what many comparably sized satellites achieve.

How to Spot It

CASSIOPE's observability from the ground depends on local conditions and its orbital geometry at any given time. Its near-polar inclination of 80.9° means it passes over a very wide range of latitudes — including high-latitude locations in Canada, Scandinavia, and other regions well north or south of the equator — multiple times daily. Observers at mid-to-high latitudes therefore have relatively frequent opportunities for passes overhead.

At 500 kg and occupying an orbit with a perigee of 294 km and apogee of 704 km, CASSIOPE is not among the largest or most reflective objects in low Earth orbit, and it is not generally listed as a conspicuously bright naked-eye target under normal conditions. However, with favorable solar geometry — shortly after sunset or before sunrise, when the satellite is sunlit but the observer's sky is dark — it may be visible as a moving point of light to observers with clear skies and knowledge of when and where to look. Using the real-time tracking data available on this site with CASSIOPE's NORAD ID 39265 is the most reliable way to identify upcoming visible passes for any specific location.