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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 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

Partially operational Commercial Imaging

Bus & Motor

CUBESAT 3U, Unknown motor

Mass

5.7 kg wet, 5.7 kg dry

Launch date (UTC)

2025-11-28 (6 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

Expand to show TLE details & history
Last TLE update: 10 hours ago

TLE from 10 hours ago

0 FLOCK 4H 28
1 66731U 25276BT  26147.43040545  .00007682  00000-0  36615-3 0  9997
2 66731  97.4187 221.1904 0006079  89.4081 270.7851 15.19371544 27269

Epoch: 2026-05-27T10:19Z

TLE epoch observation values (Epoch: 2026-05-27T10:19:47.030Z)

Latitude

0.00002°

Longitude

-178.74516°

Altitude

510.773 km

Speed

7.609 km/s

True Right ascension

14h 44m 45s

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

05:57:43

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

508.89 km

Perigee altitude

500.522 km

Semi-major axis

6,882.843 km

Eccentricity

0.00061

Inclination

97.4187°

RAAN

221.1904°

Arg. of periapsis

89.4081°

True anomaly

270.71545°

Mean anomaly

270.7851°

Eccentric anomaly

270.75027°

Mean motion

3.80094 °/min

Orbital period

94.71 mins

BSTAR

0.00036615

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

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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.
5 mins	2026-05-28 05:26:32.818Z	212.33° SW	2026-05-28 05:28:32.818Z	277.948° WNW	30.23°	2026-05-28 05:31:32.818Z	330.625° NNW
4 mins	2026-05-28 18:31:32.818Z	317.431° NNW	2026-05-28 18:32:32.818Z	292.093° WNW	22.797°	2026-05-28 18:35:32.818Z	234.704° WSW

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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: 10 hours ago

TLE from 10 hours ago

TLE epoch observation values (Epoch: 2026-05-27T10:19:47.030Z)

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: 10 hours ago