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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

Operational Commercial Imaging

Bus & Motor

CUBESAT 3U, Unknown motor

Mass

5.7 kg wet, 5.7 kg dry

Launch date (UTC)

2025-11-28 (2 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: 6 hours ago

TLE from 6 hours ago

0 FLOCK 4H 28
1 66731U 25276BT  26035.15633949  .00008780  00000-0  43678-3 0  9995
2 66731  97.4313 110.9320 0005838 113.0250 247.1600 15.17836117 10229

Epoch: 2026-02-04T03:45Z

TLE epoch observation values (Epoch: 2026-02-04T03:45:07.731Z)

Latitude

-0.00006°

Longitude

-79.67717°

Altitude

517.032 km

Speed

7.604 km/s

True Right ascension

07h 23m 43s

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

11:54:46

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

513.372 km

Perigee altitude

505.331 km

Semi-major axis

6,887.489 km

Eccentricity

0.00058

Inclination

97.4313°

RAAN

110.932°

Arg. of periapsis

113.025°

True anomaly

247.09836°

Mean anomaly

247.16°

Eccentric anomaly

247.12918°

Mean motion

3.7971 °/min

Orbital period

94.81 mins

BSTAR

0.00043678

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

IHI-SAT2, 66772

IRIDE FM2, 66696

MAUVE, 66756

LEMUR-2-STAS-GORBUK, 66686

W-SERIES 5, 66747 (Decayed)

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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.
4 mins	2026-02-04 16:59:55.686Z	58.287° ENE	2026-02-04 17:01:55.686Z	98.933° ESE	18.714°	2026-02-04 17:03:55.686Z	136.334° SSE
4 mins	2026-02-04 18:33:55.686Z	329.135° NNW	2026-02-04 18:35:55.686Z	283° WNW	22.121°	2026-02-04 18:37:55.686Z	243.016° WSW
6 mins	2026-02-05 05:11:55.686Z	182.588° SSW	2026-02-05 05:14:55.686Z	293.203° NW	39.484°	2026-02-05 05:17:55.686Z	339.841° N

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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: 6 hours ago

TLE from 6 hours ago

TLE epoch observation values (Epoch: 2026-02-04T03:45:07.731Z)

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: 6 hours ago