Nuri Rocket Fifth Launch: 14 Satellites Deployed, PERSAT02 Stays Attached

Quick answer: South Korea’s Nuri (KSLV-II) rocket completed its fifth flight on October 7, 2026 and successfully deployed 14 of the 15 satellites it carried. All five primary NEONSAT spacecraft separated as planned, along with nine of 10 CubeSats. A later check found that PERSAT02, a CubeSat developed by Quaternion, remained attached to the rocket despite an initial signal suggesting every payload had separated.

The distinction between “15 carried” and “14 deployed” matters because early reports were based on telemetry that initially appeared to show a clean release of every CubeSat. Later verification changed that picture. The updated account from The Korea Times, citing the Korea AeroSpace Administration, says PERSAT02 failed to separate. Spaceflight coverage subsequently reflected the same correction.

What happened during Nuri’s fifth launch?

Nuri lifted off from the Naro Space Center at 12:25 p.m. Korea Standard Time. The three-stage rocket completed the planned ascent sequence, with first-stage separation roughly two minutes after liftoff and second-stage separation about four and a half minutes into flight. It then reached the mission’s approximately 570-kilometer deployment altitude.

The mission was designed to be more demanding than Nuri’s previous flight because it had to place a group of primary satellites and multiple secondary spacecraft into the same orbit in a carefully timed sequence. That required repeated separation events and collision-avoidance maneuvers rather than a single primary deployment followed by a simple secondary release.

Why did early reports say all 15 satellites deployed?

The first signals from the rocket indicated that all CubeSats had separated. That produced early headlines describing a complete 15-satellite deployment. Subsequent checks found that one satellite, PERSAT02, had not left the launch vehicle.

This is an important example of why launch reporting can change during the first hour after a mission. Initial telemetry can indicate that a deployment command fired, but confirmation may require additional onboard data, tracking information or communication from the satellite itself.

The final count is therefore 14 satellites deployed: five NEONSAT microsatellites and nine CubeSats.

What is PERSAT02?

PERSAT02 is a CubeSat developed by Quaternion. According to the updated mission reporting, it was intended to track marine debris around Jeju Island and test Korean satellite components in space. It was one of 10 CubeSats flying as secondary payloads.

The failure to release PERSAT02 does not mean the launch vehicle failed to reach orbit or that the five primary spacecraft were lost. It is a payload-deployment anomaly inside an otherwise successfully completed launch sequence.

All five NEONSAT spacecraft deployed successfully

The primary purpose of the flight was the deployment of five New-space Earth Observation Satellite Constellation for National Safety spacecraft, commonly abbreviated as NEONSAT. The satellites are numbered 2 through 6 and were developed under a program overseen by KAIST.

KASA confirmed that all five separated in their planned sequence. NEONSAT-6 also established its first communication with King Sejong Station in Antarctica at about 1:08 p.m. KST, providing an early confirmation that the primary mission was progressing as intended.

Each NEONSAT is a small Earth-observation spacecraft weighing under 100 kilograms. The constellation is intended to support frequent imaging for national security, disaster response and other monitoring needs. The Korea Times reports black-and-white ground resolution of about one meter and color resolution of about four meters.

Why the 570-kilometer orbit was important

The fifth mission targeted an altitude of roughly 570 kilometers, lower than Nuri’s previous launch. The orbit was selected to meet the requirements of the NEONSAT constellation rather than simply repeating an earlier mission profile.

That matters because a launch vehicle’s usefulness is not measured only by whether it can reach space. Commercial and government customers need precise delivery to specific orbital conditions. This mission gave Nuri a more demanding multi-payload deployment profile built around a real operational constellation.

The deployment sequence was more complex than Nuri’s previous mission

According to the post-launch account, the five primary NEONSAT spacecraft began separating roughly 810 seconds after liftoff, with gaps of around 35 to 40 seconds. The secondary satellites were released in pairs at shorter intervals, while the rocket performed collision-avoidance maneuvers between deployments.

That sequence is one reason KASA still describes the fifth flight as a successful mission despite the PERSAT02 anomaly. The launch vehicle reached the intended orbit, deployed every primary payload, released nine secondary spacecraft and demonstrated the ability to manage multiple deployment events safely.

Was Nuri’s fifth launch successful?

Yes, according to KASA. The agency’s administrator said the rocket successfully completed its planned fifth launch mission. The key primary objectives — reaching the target orbit and deploying the five NEONSAT satellites — were achieved.

The agency also highlighted the flight as Korea’s first deployment of five primary satellites in one mission. The single CubeSat that did not release remains a notable anomaly and will matter for engineering follow-up, but it did not invalidate the overall launch success.

What KASA planned before launch

KASA’s official pre-launch release said Nuri would carry a record 15 satellites: five microsatellites for the national constellation and 10 CubeSats from industry, universities and research institutions. The launch window was set for 12:23 p.m. to 1:23 p.m. KST, with October 8–14 held as a backup period if weather or another issue caused a delay.

The rocket ultimately launched near the beginning of that window at 12:25 p.m. KST.

What the fifth launch means for South Korea’s space program

Nuri is South Korea’s first fully domestically developed orbital launch vehicle. Its fifth mission pushed the system beyond a basic proof that it can reach orbit. The flight had to deliver a constellation-oriented primary payload and multiple secondary spacecraft at controlled intervals.

KASA said the launch raised Nuri’s cumulative success rate from 75% to 80%. More important than that percentage is the operational experience gained in precise multi-satellite deployment, because future government and commercial missions will increasingly depend on that capability.

The NEONSAT constellation itself is also still growing. Five additional satellites are planned for a sixth Nuri mission in 2027. Once the 10-satellite system is fully operating, it is expected to provide much more frequent observation of the Korean Peninsula, including faster revisits during emergencies.

Which secondary payloads reached orbit?

The CubeSat group included spacecraft for Earth observation, component testing, optical communications and microgravity research. Reported missions include pharmaceutical crystal experiments, testing electronics and cameras for potential lunar applications, studying radiation effects on memory hardware, and demonstrating domestically developed observation payloads.

PERSAT02 was the only spacecraft later confirmed not to have separated. The remaining nine CubeSats were released into orbit.

What happens next?

Engineers will continue checking communications and commissioning status for the deployed satellites, while the PERSAT02 separation anomaly is likely to be reviewed using launch telemetry and hardware data. For the primary NEONSAT fleet, the immediate priority is establishing communications, checking spacecraft health and beginning orbital commissioning.

The sixth Nuri launch in 2027 is now especially important because it is expected to carry another five NEONSAT spacecraft and continue the buildout of the national Earth-observation constellation.

FAQ

How many satellites did Nuri deploy on October 7, 2026?

Nuri carried 15 satellites but successfully deployed 14: all five primary NEONSAT spacecraft and nine of 10 CubeSats.

Which satellite failed to deploy?

PERSAT02, a CubeSat developed by Quaternion, was later confirmed to have remained attached to the rocket.

Why did some reports say 15 satellites were deployed?

Initial signals indicated that every CubeSat had separated. Later verification showed PERSAT02 had not released, changing the confirmed deployment count from 15 to 14.

Did the Nuri launch fail?

No. KASA classified the fifth flight as successful because Nuri reached the target orbit, completed the planned flight sequence and deployed all five primary NEONSAT satellites. The PERSAT02 issue was a secondary-payload deployment anomaly.

What is Nuri also called?

Nuri is also known as KSLV-II, short for Korean Space Launch Vehicle-II.

When is the next Nuri launch?

A sixth mission is planned for 2027 and is expected to carry five more NEONSAT spacecraft, although the exact date can still change as preparations progress.