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FLOCK 4H 18, 66721

Orbit data source: Space-Track

FLOCK 4H 18, 66721 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/66721?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/66721?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

66721, 2025-276BH

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 (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: 9 hours ago

TLE from 9 hours ago

0 FLOCK 4H 18
1 66721U 25276BH  26192.78540035  .00003776  00000-0  17818-3 0  9997
2 66721  97.4174 265.7937 0002358 313.0700  47.0338 15.20064343 34153

Epoch: 2026-07-11T18:50Z

TLE epoch observation values (Epoch: 2026-07-11T18:50:58.590Z)

Latitude

0.00004°

Longitude

53.35593°

Altitude

507.63 km

Speed

7.611 km/s

True Right ascension

17h 43m 10s

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

15:42:25

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

504.235 km

Perigee altitude

500.99 km

Semi-major axis

6,880.75 km

Eccentricity

0.00024

Inclination

97.4174°

RAAN

265.7937°

Arg. of periapsis

313.07°

True anomaly

47.05358°

Mean anomaly

47.0338°

Eccentric anomaly

47.04369°

Mean motion

3.80268 °/min

Orbital period

94.67 mins

BSTAR

0.00017818

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

LEMUR-2-STARLIGHT, 66783

FLOCK 4H 19, 66722

FLOCK 4H 32, 66735

LEMUR-2-DEANANDMAEVE, 66680

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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 18 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 04:27:43.008Z	137.126° SSE	2026-07-12 04:30:43.008Z	72.001° E	30.345°	2026-07-12 04:33:43.008Z	8.24° NNE
5 mins	2026-07-12 17:32:43.008Z	27.662° NE	2026-07-12 17:34:43.008Z	80.328° E	39.051°	2026-07-12 17:37:43.008Z	175.678° S

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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 18, 66721 on other resources

View FLOCK 4H 18, 66721 on NASA - NSSDCA Website

View FLOCK 4H 18, 66721 on Heavens-Above

View FLOCK 4H 18, 66721 on Keep Track

View FLOCK 4H 18, 66721 on Celestrak

View FLOCK 4H 18, 66721 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 18, 66721

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 9 hours ago

TLE from 9 hours ago

TLE epoch observation values (Epoch: 2026-07-11T18:50:58.590Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

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

FLOCK 4H 18 Visibility forecast

Co-orbital & Co-planar RSOs

Check out FLOCK 4H 18, 66721 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 9 hours ago