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MERCURY ONE (M1), 66742

Orbit data source: Space-Track

MERCURY ONE (M1), 66742 is an American payload satellite 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/66742?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/66742?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

66742, 2025-276CE

Orbit

SSO

Country

Related business

Proteus Space (US)

Manufacturer

PROTE

Mission

Operational Commercial Technology

Bus & Motor

M1, Unknown motor

Mass

50 kg wet, 50 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, 0.4 m

Radar Cross Section

0.400 m²

Expand to show TLE details & history
Last TLE update: 12 hours ago

TLE from 12 hours ago

0 MERCURY ONE (M1)
1 66742U 25276CE  26141.19821853  .00003044  00000-0  14712-3 0  9997
2 66742  97.4196 215.2020 0003842  79.5405 280.6263 15.19368550 26325

Epoch: 2026-05-21T04:45Z

TLE epoch observation values (Epoch: 2026-05-21T04:45:26.080Z)

Latitude

-0.00001°

Longitude

-95.00353°

Altitude

510.35 km

Speed

7.609 km/s

True Right ascension

14h 20m 48s

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

02:08:34

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

507.359 km

Perigee altitude

502.071 km

Semi-major axis

6,882.852 km

Eccentricity

0.00038

Inclination

97.4196°

RAAN

215.202°

Arg. of periapsis

79.5405°

True anomaly

280.58303°

Mean anomaly

280.6263°

Eccentric anomaly

280.60466°

Mean motion

3.80094 °/min

Orbital period

94.71 mins

BSTAR

0.00014712

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

FLOCK 4H 30, 66733

NUSAT-51 (YVONNE BRILL), 66740

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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MERCURY ONE (M1) 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	2026-05-21 17:57:36.887Z	4.853° NNE	2026-05-21 18:00:36.887Z	300.098° NW	42.207°	2026-05-21 18:03:36.887Z	204.067° SW
5 mins	2026-05-22 04:36:36.887Z	137.945° SSE	2026-05-22 04:38:36.887Z	85.855° E	34.661°	2026-05-22 04:41:36.887Z	5.472° 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 MERCURY ONE (M1), 66742 on other resources

View MERCURY ONE (M1), 66742 on NASA - NSSDCA Website

View MERCURY ONE (M1), 66742 on Heavens-Above

View MERCURY ONE (M1), 66742 on Keep Track

View MERCURY ONE (M1), 66742 on Celestrak

View MERCURY ONE (M1), 66742 on Gunter's Space Page

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

MERCURY ONE (M1), 66742

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 12 hours ago

TLE from 12 hours ago

TLE epoch observation values (Epoch: 2026-05-21T04:45:26.080Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

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

MERCURY ONE (M1) Visibility forecast

Co-orbital & Co-planar RSOs

Check out MERCURY ONE (M1), 66742 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 12 hours ago