Why Smaller, Low-Orbit Satellites Offer a Safer Solution to Space Debris.

Assessing the Risks of Crowded Orbits

According to TSN.ua: A research team led by John McIntosh from the University of Manchester has analyzed the dangers posed by an increasingly congested space environment. Their findings suggest that deploying smaller satellites in lower orbits is a safer strategy than using larger satellites at higher altitudes. This insight is critical as thousands of new satellites are planned for launch in the coming decade.

Significant technical modifications are required to move a satellite's orbit from 300 km to 750 km, including:

• Increasing camera aperture from 0.33 m to 0.83 m;
• A substantial rise in satellite mass: from 107 kg at 300 km to 1360 kg at 750 km, assuming image quality remains constant.

The study further indicates that to image any point on Earth within an hour from 750 km, a constellation of 10 large satellites is needed. In contrast, the same coverage from 300 km can be achieved with just 22 compact satellites.

The Threat to Orbiting Satellites

It is crucial to note that the highest flux of hazardous debris is recorded at altitudes between 850 and 950 km, posing a severe risk to large satellites operating in that zone. In a move highlighting this concern, the company Starlink has already relocated some of its satellites from 550 km down to 480 km, demonstrating a proactive effort to mitigate collision risks from space junk.

This research has significant implications for the space industry, as it points to the necessity of rethinking satellite deployment strategies. — John McIntosh

Consequently, the study's results underscore the importance of selecting optimal orbits to ensure both the safety and operational efficiency of satellites, especially given the growing strain on the orbital environment.

By shifting to smaller, more compact models, companies can not only reduce risks but also enhance the overall effectiveness of their missions.