Satrec's 10-Centimeter Satellites Need Thinner Air to Work

Satrec Initiative will build four satellites to capture 10-centimeter-class optical imagery for Hanwha's reconnaissance constellation, Executive Vice President Eugene Kim said at World Space Business Week in Paris, which ran Sept. 14 to 17. Getting to that resolution means operating below 400 kilometers, low enough that atmospheric drag and atomic-oxygen exposure start eroding a spacecraft within months rather than years, according to SpaceNews, which covered the presentation.

What Satrec actually committed to

The four satellites will complement a separate constellation of 64 synthetic-aperture-radar satellites Hanwha Systems plans to have launched and operating by 2031, aiming for a 30-minute revisit anywhere on the target area, Kim said. Optical imagery at 10 centimeters roughly doubles the resolution of Satrec's SpaceEye-T, a satellite launched in 2025 that delivers 25-centimeter imagery today, itself an upgrade from the 30-centimeter capability Hanwha and Satrec described when Hanwha first took a stake in the company. Rather than jump straight to an operational fleet, Hanwha will fly a test satellite near 500 kilometers first and lower its orbit incrementally, using the data to validate how the design holds up before committing to the four production satellites, Kim said. "Together with ultra-high-resolution SAR and ultra-high-resolution electro-optical, the constellation is expected to open up new opportunities to provide Satellite as a Service in the defense and intelligence field," Kim said, framing the imagery as a subscription product for government and military customers rather than a one-off sale of pictures. A Satrec subsidiary, SI Analytics, is building the AI software meant to turn that resolution into usable intelligence rather than raw pixels.

Why 10 centimeters means fighting the atmosphere

The number that matters in this announcement is not the resolution but the altitude it forces. Optical resolution from orbit scales with how close the camera gets to the ground, which is why Satrec's push from 25 to 10 centimeters means dropping from a several-hundred-kilometer sun-synchronous orbit into very low Earth orbit, below the 400-kilometer band where most Earth-observation satellites, including SpaceEye-T, fly today. Below that line, the atmosphere is thin but not absent, and drag that a satellite at 500 kilometers barely notices becomes a constant force requiring regular propulsion just to hold altitude. Atomic oxygen, a byproduct of solar radiation splitting O2 molecules in the upper atmosphere, also erodes exposed spacecraft materials at rates that do not matter at 700 kilometers and matter a great deal at 300. Every VLEO Earth-observation program to date has traded resolution for satellite lifespan and added propellant mass; Satrec has not yet said how it plans to resolve that trade for a four-satellite production run.

The $36 billion program this order sits inside

The satellite order is a small piece of a far larger commitment. Hanwha Group said on July 3 it will invest 55 trillion won, about $36 billion, through 2040 across launch vehicles, satellite manufacturing, and an orbiting AI data center, according to the Korea JoongAng Daily. Roughly 23 trillion won of that goes to Hanwha Aerospace for launch vehicles and assembly facilities, and about 20 trillion won to Hanwha Systems for satellites, the AI data center, and communications networks. "The first step toward securing space sovereignty is developing our own launch vehicle, and Hanwha will build the capability for Korea to reach space at any time, on our own terms," Hanwha Group Vice Chairman Kim Dong-kwan said at the announcement in Jinju, South Gyeongsang.

Asset	Altitude	Resolution / capacity	Target date
SAR constellation	350 km	10-15 cm object identification	64 satellites by 2031
Orbiting AI data center	400 km	45 MW growing to 135 MW	Capacity target by 2032
Comms network	900 km	Real-time imagery relay	Part of 2031 buildout
Satrec optical satellites	Below 400 km	10 cm imagery	Four satellites, no date given

Hanwha originally bought roughly 20 percent of Satrec Initiative for about 1 trillion won, with a further 10 percent planned, Korea Herald reported when the relationship began; Satrec, founded in 1999 by engineers who built Korea's first satellite, KITSAT-1, is now the optical-imaging arm of a group trying to build a domestic space industry from launch vehicles down to the ground stations that process the pictures. Hanwha frames that vertical integration as necessary rather than opportunistic: the global Earth-observation satellite market is on pace to reach $615.7 billion by 2032, growing roughly 8.1 percent a year, and a company that owns the launch vehicle, the satellite bus, the sensor and the analytics software captures a larger share of that spending per mission than one that buys any of those pieces from a supplier.

What would change this read

Earth observation is attracting capital well beyond Korea. Pixxel raised $100 million on Sept. 7 in India's largest spacetech round to build its own hyperspectral constellation, one more sign that governments are increasingly buying reconnaissance imagery from private operators instead of building satellites themselves. What separates a funded ambition from a working constellation is the part Hanwha has not yet shown: a satellite that has actually flown at sub-400-kilometer altitude for a full mission life without running out of station-keeping propellant. Until the test satellite Kim described completes its incremental descent, and Hanwha or Satrec publishes what that satellite's fuel budget and lifespan actually were, the 10-centimeter number is a specification, not a demonstrated capability. The launch vehicle work Hanwha Aerospace is funding alongside SpaceX's own push toward a working Starship suggests the group is planning to control that dependency too, rather than rely on outside launch providers to hit a 2031 deadline it set for itself.