ARIRANG-2 (KOMPSAT-2)

ARIRANG-2, internationally designated 2006-031A and tracked in the NORAD catalog under ID 29268, is a South Korean Earth observation satellite operated by the Korea Aerospace Research Institute (KARI). Launched in the summer of 2006, it represents a significant milestone in South Korea's ambitions to develop an indigenous space capability, continuing a program that links national aerospace ambition with the cultural identity evoked by one of Korea's most beloved traditional folk songs. As of the most recent catalog data, the satellite remains in orbit, circling the Earth in a sun-synchronous configuration at an altitude well above the densest layers of the atmosphere.

Mission and Purpose

ARIRANG-2's roots stretch back to 1995, when South Korean engineers and planners first laid the groundwork for what would become an increasingly ambitious series of multipurpose observation spacecraft. By the time the satellite reached the launch pad more than a decade later, it embodied years of accumulated technical development and international collaboration — a testament to how long-horizon planning in the space sector often is.

The satellite's primary role is Earth observation. Multipurpose observation spacecraft of this class are generally tasked with imaging Earth's surface for a range of civil, governmental, and scientific applications. These can include land-use mapping, agricultural monitoring, urban planning support, disaster assessment, and environmental monitoring. Korea, as a technologically advanced nation with significant agricultural land, complex coastal geography, and a densely populated peninsula, has ample domestic motivation to maintain persistent overhead coverage of its own territory and the broader region.

The name Arirang carries cultural weight beyond mere branding. Like its predecessor, KOMPSAT-1, this spacecraft takes its identity from the eponymous Korean folk song — arguably the most widely recognized piece of traditional Korean music, sung across different regional variations throughout the peninsula for centuries. The decision to give a modern space asset a name drawn from this cultural well reflects a deliberate effort to connect technological achievement with national heritage, something that space agencies and programs around the world have done in various ways.

KARI — the Korea Aerospace Research Institute, the agency responsible for operating ARIRANG-2 — is South Korea's principal government body for aerospace research and development. Established in the late 1980s, KARI has overseen successive generations of Korean satellites, rockets, and related technologies, and KOMPSAT-2 sits squarely within that developmental lineage. The specific mission status and operational condition of the satellite are not on record in the current catalog entry, and no public documentation of its precise current activity has been incorporated here.

Orbit and Tracking

ARIRANG-2 occupies a sun-synchronous orbit (SSO), a category of low Earth orbit that is particularly well-suited to Earth observation missions. In a sun-synchronous orbit, the satellite's orbital plane precesses at a rate that keeps it aligned with the Earth-Sun geometry throughout the year — meaning the spacecraft passes over any given location on the surface at roughly the same local solar time on each revisit. This consistency is enormously valuable for optical remote sensing, because it ensures that lighting conditions remain relatively stable from one image acquisition to the next, making it far easier to compare imagery taken days, weeks, or months apart.

The satellite maintains an apogee of 693 km and a perigee of 671 km, giving it a nearly circular orbit with only a modest difference of 22 km between its highest and lowest points. At this altitude, it is well within the low Earth orbit regime — high enough to avoid significant atmospheric drag on short timescales, yet low enough to achieve the ground resolution that makes Earth observation satellites useful for detailed surface imaging.

The orbital inclination is 97.8°, which is the slight retrograde tilt characteristic of sun-synchronous orbits. A standard prograde equatorial orbit would sit near 0° inclination; polar orbits approach 90°; and SSO spacecraft are inclined slightly beyond 90° so that Earth's equatorial bulge causes the necessary precession of the orbital plane. At 97.8°, ARIRANG-2 passes over high-latitude regions as well as the tropics, providing global or near-global coverage over the course of multiple orbital cycles.

Each orbit takes approximately 98.3 minutes to complete, meaning the satellite completes roughly 14 to 15 full orbits of the Earth each day. Over successive orbits, the Earth rotates beneath the spacecraft's ground track, allowing imaging coverage to shift westward with each pass and eventually tile across broad geographic areas.

ARIRANG-2 was launched from the Plesetsk Cosmodrome in Russia, one of the world's most active launch facilities and a longtime workhorse for a wide variety of Russian and international payloads. The launch took place on July 27–28, 2006 — specifically at 20:00 Eastern Daylight Time on July 27, which corresponds to the early UTC hours of July 28. Signal acquisition was confirmed later that same day, confirming that the spacecraft had survived the rigors of launch and deployment and was functioning as expected in its operational orbit.

Design and Operator

ARIRANG-2 is cataloged as a payload-class object, distinguishing it from rocket bodies and debris that accompany any launch. Its manufacturer is not recorded in the available catalog data, and its mass is similarly not on public record in this entry. What is documented is that KARI holds operational responsibility for the spacecraft, and that South Korea is recorded as its owner country — reflecting the fully national character of the program despite any international partnerships that may have contributed to its development.

The KOMPSAT program — of which ARIRANG-2 is the second flight unit — has been KARI's flagship Earth observation satellite series. The naming convention, both the technical KOMPSAT designation (Korea Multi-Purpose Satellite) and the cultural Arirang identifier, has been maintained across multiple subsequent missions, indicating institutional commitment to a coherent and continuing program rather than a one-off effort.

Sun-synchronous, near-circular low Earth orbits at the altitude range of ARIRANG-2 are a well-established and internationally common choice for observation satellites. Spacecraft in this regime typically carry electro-optical imagers or multispectral sensors suited to capturing detailed imagery of the surface below. The ground swath, revisit frequency, and image resolution achievable from approximately 680 km altitude have made this orbital band a kind of standard for the remote sensing community globally.

Legacy and Current Status

The launch of ARIRANG-2 in 2006 was the product of more than a decade of development work initiated in 1995, and it arrived at a moment when South Korea was actively building the technical and institutional foundation for a more autonomous national space capability. Subsequent satellites in the KOMPSAT series have followed, carrying progressively more capable sensors and demonstrating the maturation of South Korean aerospace engineering.

As of the current catalog data, ARIRANG-2 remains in orbit and has not undergone a decay or reentry event. This is not unusual for spacecraft at its altitude — objects in circular orbits in the 670–700 km range experience very low atmospheric drag and can persist in orbit for extended periods without active station-keeping. Whether the satellite remains operationally active, has been placed in standby, or has reached the end of its useful service life is not reflected in the catalog record available here.

The broader significance of ARIRANG-2 lies in what it represented at the time and what it contributed to afterward. It demonstrated that South Korea had the organizational capacity to conceive, develop, and successfully operate a sophisticated Earth observation satellite across a span of years — a capability that relatively few nations possessed in 2006. That foundation has since supported further missions and helped establish KARI as a credible participant in the international space community.

How to Spot It

ARIRANG-2 orbits at altitudes between 671 and 693 km, in a near-circular sun-synchronous orbit that carries it over nearly all latitudes. At that altitude and with the orbital inclination of 97.8°, the satellite passes over a wide range of geographic locations on a regular schedule, making it visible from most inhabited parts of the world under the right conditions.

Like most low Earth orbit satellites, ARIRANG-2 is visible to the naked eye only during a relatively narrow window: when the observer on the ground is in twilight or darkness, but the satellite itself is still illuminated by sunlight. This typically means the best observation windows occur in the hour or two after sunset or before sunrise. During a favorable pass, it would appear as a slow-moving, steady point of light traversing the sky over the course of a few minutes. It carries no onboard lighting visible at such distances, so its visibility depends entirely on reflected sunlight. LowEarth's live tracking tools can be used to calculate upcoming passes for any specific location based on the satellite's current orbital elements.