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FLOCK 4H 28, 66731

Orbit data source: Space-Track

FLOCK 4H 28, 66731 is a payload satellite owned by Planet (US) in SSO that was launched on Fri, 28 Nov 2025 UTC via an FALCON 9 launch vehicle from the Air Force Western Test Range (AFWTR). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.

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<iframe src="https://www.satcat.com/sats-embedded/66731?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/66731?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

66731, 2025-276BT

Orbit

SSO

Country

Related business

Planet Labs PBC (US)

Manufacturer

Planet

Mission

Non-operational Commercial Imaging

Bus & Motor

CUBESAT 3U, Unknown motor

Mass

5.7 kg wet, 5.7 kg dry

Launch date (UTC)

2025-11-28 (7 months ago)

Launch vehicle

FALCON 9

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 2 Pan, 1.0 m

Radar Cross Section

0.072 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history
Last TLE update: 14 hours ago

TLE from 14 hours ago

0 FLOCK 4H 28
1 66731U 25276BT  26192.73242116  .00006573  00000-0  30868-3 0  9990
2 66731  97.4184 265.7144 0002932 283.9922  76.0987 15.19953830 34141

Epoch: 2026-07-11T17:34Z

TLE epoch observation values (Epoch: 2026-07-11T17:34:41.188Z)

Latitude

-0°

Longitude

72.40137°

Altitude

508.585 km

Speed

7.61 km/s

True Right ascension

17h 42m 51s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow 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

19:49:57

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

504.964 km

Perigee altitude

500.929 km

Semi-major axis

6,881.083 km

Eccentricity

0.00029

Inclination

97.4184°

RAAN

265.7144°

Arg. of periapsis

283.9922°

True anomaly

76.13132°

Mean anomaly

76.0987°

Eccentric anomaly

76.11501°

Mean motion

3.8024 °/min

Orbital period

94.68 mins

BSTAR

0.00030868

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Other satellites on launch #276 in the year 2025 (2025-11-28 UTC)

FLOCK 4H 32, 66735

FOSSASAT2E24, 66780

LEMUR-2-CELIJO-SB-PK, 66781

LEMUR-2-STARLIGHT, 66783

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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

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FLOCK 4H 28 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	2026-07-12 17:50:34.710Z	8.967° NNE	2026-07-12 17:53:34.710Z	239.777° WSW	44.276°	2026-07-12 17:56:34.710Z	196.806° SSW
5 mins	2026-07-13 04:29:34.710Z	122.713° SE	2026-07-13 04:31:34.710Z	59.043° ENE	30.263°	2026-07-13 04:34:34.710Z	5.735° NNE

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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 FLOCK 4H 28, 66731 on other resources

View FLOCK 4H 28, 66731 on NASA - NSSDCA Website

View FLOCK 4H 28, 66731 on Heavens-Above

View FLOCK 4H 28, 66731 on Keep Track

View FLOCK 4H 28, 66731 on Celestrak

View FLOCK 4H 28, 66731 on Gunter's Space Page

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

FLOCK 4H 28, 66731

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 14 hours ago

TLE from 14 hours ago

TLE epoch observation values (Epoch: 2026-07-11T17:34:41.188Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #276 in the year 2025 (2025-11-28 UTC)

FLOCK 4H 28 Visibility forecast

Co-orbital & Co-planar RSOs

Check out FLOCK 4H 28, 66731 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 14 hours ago