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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 (9 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: 17 hours ago

TLE from 17 hours ago

0 FLOCK 4H 28
1 66731U 25276BT  26238.14500439  .00013049  00000-0  59383-3 0  9990
2 66731  97.4142 310.3787 0005779 125.4509 234.7266 15.20822123 41040

Epoch: 2026-08-26T03:28Z

TLE epoch observation values (Epoch: 2026-08-26T03:28:48.379Z)

Latitude

-0.00008°

Longitude

-76.22508°

Altitude

508.749 km

Speed

7.608 km/s

True Right ascension

20h 41m 30s

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

11:46:34

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

504.3 km

Perigee altitude

496.35 km

Semi-major axis

6,878.462 km

Eccentricity

0.00058

Inclination

97.4142°

RAAN

310.3787°

Arg. of periapsis

125.4509°

True anomaly

234.67256°

Mean anomaly

234.7266°

Eccentric anomaly

234.69958°

Mean motion

3.80458 °/min

Orbital period

94.62 mins

BSTAR

0.00059383

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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.
6 mins	2026-08-27 04:52:39.522Z	162.247° S	2026-08-27 04:55:39.522Z	20.718° NNE	43.511°	2026-08-27 04:58:39.522Z	350.846° N
5 mins	2026-08-27 17:57:39.522Z	357.052° N	2026-08-27 17:59:39.522Z	246.114° WSW	40.864°	2026-08-27 18:02:39.522Z	202.675° SW

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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: 17 hours ago

TLE from 17 hours ago

TLE epoch observation values (Epoch: 2026-08-26T03:28:48.379Z)

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: 17 hours ago