RADARSAT-2

RADARSAT-2 is a Canadian Earth observation satellite operating in low Earth orbit since late 2007. Built and operated by MDA Space, it represents a significant evolution in Canada's synthetic aperture radar (SAR) satellite program, offering high-resolution, all-weather, day-and-night imaging capabilities to users around the world. Assigned NORAD catalog ID 32382 and international designator 2007-061A, the satellite continues to circle the globe from a near-circular sun-synchronous orbit, collecting radar imagery for a broad range of civilian and commercial applications.

Mission and Purpose

RADARSAT-2 was developed as a follow-on to Canada's original RADARSAT-1 mission, extending and significantly enhancing the country's spaceborne radar imaging capabilities. Unlike optical satellites that depend on sunlight and are impeded by cloud cover, SAR instruments transmit their own microwave pulses toward Earth's surface and record the reflected signals, allowing them to produce detailed imagery regardless of weather conditions or time of day. This characteristic makes SAR satellites particularly valuable for monitoring polar sea ice, tracking ships, assessing flood and disaster zones, supporting agricultural surveys, and conducting environmental surveillance over remote or frequently overcast regions.

RADARSAT-2 was conceived as a public-private partnership between the Canadian Space Agency and MDA Space (then known as MacDonald, Dettwiler and Associates), with MDA assuming ownership and operational responsibility for the spacecraft in exchange for providing data access to Canadian government users. The arrangement shifted more of the commercial risk and reward to the private sector while preserving government access to imagery for policy, sovereignty, and emergency management purposes. Under this model, MDA markets RADARSAT-2 data internationally to commercial clients, research institutions, and foreign government agencies.

The satellite's C-band SAR instrument operates at a wavelength that penetrates cloud cover and light precipitation, making it especially suited for maritime surveillance and ice monitoring in Canada's vast northern waters. Canadian authorities have relied on RADARSAT-2 data to support Arctic sovereignty patrols, monitor the Northwest Passage, and track vessel traffic in areas where persistent cloud cover would render optical sensors largely ineffective. Beyond Canadian applications, the satellite has supported humanitarian response operations, coastline mapping, oil spill detection, and land-use analysis across every continent.

Orbit and Tracking

RADARSAT-2 occupies a sun-synchronous orbit (SSO), a particular type of near-polar orbit in which the orbital plane precesses at a rate matching Earth's revolution around the Sun. This geometry ensures that the satellite crosses any given latitude at approximately the same local solar time on each pass, which is important for consistent illumination conditions in visible-light reference data and for maintaining a predictable revisit schedule. Sun-synchronous orbits are a standard choice for Earth observation missions precisely because of this regularity.

The satellite's current orbital parameters place it at an apogee of 797 km and a perigee of 795 km, making it an exceptionally circular orbit with only about 2 km of variation between its highest and lowest points. It travels at an inclination of 98.6°, the slight retrograde tilt required to achieve the sun-synchronous precession at this altitude. With an orbital period of approximately 100.6 minutes, RADARSAT-2 completes roughly 14 full orbits of Earth each day, building up coverage of different swaths with each successive pass.

The near-circular orbit is deliberately maintained to keep imaging geometry consistent from pass to pass. Because SAR image quality and geometric accuracy are sensitive to variations in altitude, the minimal eccentricity of RADARSAT-2's orbit helps ensure that acquired scenes can be reliably compared and mosaicked. Station-keeping maneuvers using onboard propellant maintain this tight orbital envelope over time, counteracting the slow orbital decay that atmospheric drag and other perturbations would otherwise impose.

For satellite trackers and researchers, RADARSAT-2 is cataloged under NORAD ID 32382 and can be followed using standard two-line element (TLE) data distributed by the 18th Space Control Squadron and aggregated on tracking platforms such as LowEarth. As a non-tumbling, actively controlled spacecraft at nearly 800 km altitude, its position is predictable with high accuracy.

Design and Operator

RADARSAT-2 was designed, built, and is operated by MDA Space, a Canadian aerospace company headquartered in the greater Vancouver area that has been central to Canada's space program for decades. The spacecraft has a launch mass of approximately 2,300 kg, placing it in the medium-class category for Earth observation satellites. Its structure was engineered to accommodate a sophisticated C-band SAR antenna capable of multiple imaging modes, ranging from wide-swath scanning to fine-resolution spotlight imaging, giving operators flexibility to tailor data collection to specific mission needs.

The satellite launched on 14 December 2007 atop a Soyuz-FG rocket operated by Starsem, lifting off from the Baikonur Cosmodrome in Kazakhstan. This launch vehicle and pad combination was a well-established and reliable choice for medium-mass payloads into sun-synchronous orbits, and the mission reached its intended orbit successfully. The spacecraft's design life was intended to support operations for a number of years, yet as of the time of writing, it remains operational well beyond its original design horizon — a testament to conservative engineering margins and careful propellant management.

MDA Space retains ownership of the satellite, distinguishing RADARSAT-2 from other government-owned Earth observation assets. The Canadian Space Agency, while instrumental in the satellite's funding and development, is a customer of the data rather than the operator. This commercial ownership model was somewhat novel in the Canadian space context when the mission was conceived and helped shape subsequent discussions about the structure of public-private partnerships in national space programs.

Significance and Current Status

RADARSAT-2 holds an important place in the history of Canadian space activity as the country's most capable radar observation satellite for much of the twenty-first century's opening decades. It provided continuity of SAR coverage following the end of RADARSAT-1 operations and served as a bridge toward the subsequent RADARSAT Constellation Mission (RCM), a three-satellite fleet launched in 2019 that expanded Canada's radar imaging capacity considerably. Even after the RCM became operational, RADARSAT-2 continued to function as a supplementary asset, adding imaging capacity and offering archival consistency for time-series analyses that benefit from a single, stable sensor over many years.

The satellite's long operational life has allowed it to accumulate an extensive archive of Earth observation data, capturing changes in Arctic ice extent, coastal erosion, agricultural land cover, urban expansion, and a variety of environmental and geophysical phenomena over a multi-year baseline. Such archives are of considerable scientific value, enabling researchers to detect and quantify trends that would be invisible in any single-epoch dataset.

Because mission status is not definitively confirmed in public catalog records at the time of this writing, the precise operational condition of the spacecraft cannot be stated with certainty here. However, the satellite remains in orbit and, based on its maintained near-circular trajectory at the expected altitude and inclination, shows the characteristics of a managed, actively controlled spacecraft rather than a derelict object. No reentry or decay event has been recorded.

RADARSAT-2 also contributed to international SAR data-sharing agreements, supplying imagery to the International Charter on Space and Major Disasters — a cooperative arrangement through which satellite operators provide free data to support emergency response following floods, earthquakes, wildfires, and other large-scale catastrophes. Activations of the charter following major disasters around the world have drawn on RADARSAT-2 data as part of multi-source response packages, reflecting the satellite's broader humanitarian contribution alongside its commercial role.

How to Spot It

At an altitude of roughly 796 km and with a mass of 2,300 kg, RADARSAT-2 is a substantial object, but it is not among the brightest satellites visible to the naked eye. Its solar panels generate reflected sunlight that can make it detectable under good conditions — specifically during the twilight windows shortly after sunset or before sunrise, when the satellite is illuminated by the Sun while the observer on the ground is in darkness. During mid-day and in the middle of the night, the geometry works against naked-eye observation.

Passes that carry the satellite nearly overhead at a high elevation angle offer the best chance of a sighting, appearing as a slow, steady moving point of light crossing the sky over several minutes. The sun-synchronous orbit means that, for observers at mid-to-high northern or southern latitudes, overhead passes tend to cluster around the same local times each day, making RADARSAT-2 reasonably predictable to observe once its pass schedule for a given location is known. LowEarth's pass prediction tools, using current TLE data for NORAD ID 32382, will yield accurate rise, culmination, and set times and sky directions for any observer's coordinates.