OBJECT H, 66657

Orbit data source: Space-Track

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Recently launched and/or uncataloged satellites may have evolving metadata. Metadata may include but not limited to: Owner, Maufacturer, Bus, Motor, and Mission.

OBJECT H, 66657 is a South Korean satellite in SSO that was launched on Wed, 26 Nov 2025 UTC via an NURI launch vehicle from the Naro Space Center, South Korea (NSC). Unknown objects in Earth's orbit typically refer to objects detected orbiting the Earth but have not yet been identified or cataloged. These objects could be anything from previously untracked satellites, spent rocket stages, debris from satellite collisions, or even natural meteoroids temporarily captured by Earth's gravity.

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<iframe src="https://www.satcat.com/sats-embedded/66657?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/66657?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

66657, 2025-274H

Orbit

SSO

Country

KR / SKOR

Related business

Sejong University (KR)

Manufacturer

SEJU

Mission

Operational Amateur Earth Obs Sci

Bus & Motor

CUBESAT 2U, Unknown motor

Mass

2 kg wet, 2 kg dry

Launch date (UTC)

2025-11-26 (6 months ago)

Launch vehicle

NURI

Launch site

Naro Space Center, South Korea (NSC)

Object type

Unknown

Shape & HBR

Box, 1.1 m

Radar Cross Section

0.035 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history
Last TLE update: 23 hours ago

TLE from 23 hours ago

0 OBJECT H
1 66657U 25274H   26151.77352439  .00002581  00000-0  25039-3 0  9993
2 66657  97.7488  81.3004 0013746  71.1468 289.1241 14.93473077 27774

Epoch: 2026-05-31T18:33Z

TLE epoch observation values (Epoch: 2026-05-31T18:33:52.507Z)

Latitude

-0.00003°

Longitude

-86.43876°

Altitude

587.035 km

Speed

7.568 km/s

True Right ascension

05h 25m 12s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

03:18:35

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

593.703 km

Perigee altitude

574.562 km

Semi-major axis

6,962.269 km

Eccentricity

0.00137

Inclination

97.7488°

RAAN

81.3004°

Arg. of periapsis

71.1468°

True anomaly

288.97519°

Mean anomaly

289.1241°

Eccentric anomaly

289.04965°

Mean motion

3.73609 °/min

Orbital period

96.36 mins

BSTAR

0.00025039

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Other satellites on launch #274 in the year 2025 (2025-11-26 UTC)

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OBJECT H Visibility forecast

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Span	Click to sort rows by Start time (UTC) header in descending order	Start Az.	Max El. time (UTC)	Max El. Az.	Max El.	End time (UTC)	End Az.
6 mins	2026-06-01 18:49:11.354Z	135.905° SSE	2026-06-01 18:52:11.354Z	73.95° E	31.854°	2026-06-01 18:55:11.354Z	9.171° NNE
7 mins	2026-06-02 08:07:11.354Z	15.848° NNE	2026-06-02 08:10:11.354Z	86.517° E	44.539°	2026-06-02 08:14:11.354Z	189.697° SSW

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Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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Check out OBJECT H, 66657 on other resources

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View OBJECT H, 66657 on Keep Track

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View OBJECT H, 66657 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

OBJECT H, 66657

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 23 hours ago

TLE from 23 hours ago

TLE epoch observation values (Epoch: 2026-05-31T18:33:52.507Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #274 in the year 2025 (2025-11-26 UTC)

OBJECT H Visibility forecast

Co-orbital & Co-planar RSOs

Check out OBJECT H, 66657 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 23 hours ago