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SES 21, 53961

Orbit data source: Space-Track

SES 21, 53961 is a payload satellite owned by SES (LU) in GEO that was launched on Tue, 04 Oct 2022 UTC via an ATLAS V 531 launch vehicle from the Air Force Eastern Test Range (AFETR). 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/53961?theme=dark&initialShowStats=false

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Identifier

53961, 2022-123B

Orbit

GEO

Country

LU / SES

Related business

SES S.A. (LU)

Manufacturer

Boeing/ES

Mission

Operational Commercial Communications

Bus & Motor

BSS-702SP, R-4D

Mass

1,768 kg wet, ~1,638 kg dry

Launch date (UTC)

2022-10-04 (3 years ago)

Launch vehicle

ATLAS V 531

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 2 Pan, 15.0 m

Radar Cross Section

48.465 m², Large (>1 m²)

Expand to show TLE details & history
Last TLE update: 13 hours ago

TLE from 13 hours ago

0 SES 21
1 53961U 22123B   26048.57169898  .00000074  00000-0  00000+0 0  9997
2 53961   0.0262  55.3695 0001005 271.5216 255.4330  1.00270283  6011

Epoch: 2026-02-17T13:43Z

TLE epoch observation values (Epoch: 2026-02-17T13:43:14.791Z)

Latitude

0.02323°

Longitude

-131.02496°

Altitude

35,787.572 km

Speed

3.075 km/s

True Right ascension

14h 49m 20s

True Declination

0° 01' 24"

Sunlit

Object was in daylight 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

05:59:08

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,792.324 km

Perigee altitude

35,783.849 km

Semi-major axis

42,166.223 km

Eccentricity

0.0001

Inclination

0.0262°

RAAN

55.3695°

Arg. of periapsis

271.5216°

True anomaly

255.42185°

Mean anomaly

255.433°

Eccentric anomaly

255.42743°

Mean motion

0.25067 °/min

Orbital period

1,436.17 mins

BSTAR

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Computing Atmospheric mass density...

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Other satellites on launch #123 in the year 2022 (2022-10-04 UTC)

SES 20, 53960

ATLAS 5 CENTAUR R/B, 53962

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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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SES 21 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.
1440 mins	2026-02-18 03:07:13.221Z	217.106° SW	2026-02-18 10:32:13.221Z	217.161° SW	30.866°	2026-02-19 03:07:13.221Z	217.112° SW

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53961 neighbors

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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 SES 21, 53961 on other resources

View SES 21, 53961 on NASA - NSSDCA Website

View SES 21, 53961 on Heavens-Above

View SES 21, 53961 on Keep Track

View SES 21, 53961 on Celestrak

View SES 21, 53961 on Gunter's Space Page

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

SES 21, 53961

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 13 hours ago

TLE from 13 hours ago

TLE epoch observation values (Epoch: 2026-02-17T13:43:14.791Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #123 in the year 2022 (2022-10-04 UTC)

SES 21 Visibility forecast

53961 neighbors

Co-orbital & Co-planar RSOs

Check out SES 21, 53961 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 13 hours ago