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SBIRS GEO 4 (USA 273), 41937

Orbit data source: Space-Track

SBIRS GEO 4 (USA 273), 41937 is a payload satellite owned by USAF AFSPC (US) in GEO that was launched on Sat, 21 Jan 2017 UTC via an ATLAS V 401 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.

Not visible in the next 10 days

Iframe embed code

<iframe src="https://www.satcat.com/sats-embedded/41937?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/41937?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

41937, 2017-004A

Orbit

GEO

Last TLE update

19 hours ago

Origin

United States Air Force (US)

Manufacturer

LMSS

Mission

Operational Defense Early Warn

Bus & Motor

A2100, LEROS 1C?

Mass

~4,500 kg wet, ~2,500 kg dry

Launch date (UTC)

2017-01-21 (8 years ago)

Launch vehicle

ATLAS V 401

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Box + 2 Pan, 25 m

Radar Cross Section

33.213 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 19 hours ago

0 SBIRS GEO 4 (USA 273)
1 41937U 17004A   25185.94066091 -.00000177  00000-0  00000-0 0  9998
2 41937   1.6635  28.7710 0001316  69.5008 255.9429  0.99978043 31112

Epoch: 2025-07-04T22:34Z

TLE epoch observation values (Epoch: 2025-07-04T22:34:33.102Z)

Latitude

-0.95131°

Longitude

92.39119°

Altitude

35,870.121 km

Speed

3.072 km/s

True Right ascension

23h 36m 51s

True Declination

0° 57' 01"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-1.6149°

Longitude

20.02589°

Altitude

35,874.506 km

Speed

3.071 km/s

Apparent Right ascension

18h 40m 32s

Apparent Declination

-6° 23' 34"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

05:40:45

Azimuth

334.224° NNW

Elevation

-53.889°

Doppler factor

Orbital elements

Apogee altitude

35,875.77 km

Perigee altitude

35,864.65 km

Semi-major axis

42,248.347 km

Eccentricity

0.00013

Inclination

1.6635°

RAAN

28.771°

Arg. of periapsis

69.5008°

True anomaly

Unknown

Mean anomaly

255.9429°

Eccentric anomaly

Unknown

Mean motion

0.24994 °/min

Orbital period

1,440.37 mins

BSTAR

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41937 neighbors

Authenticating...

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Other satellites on launch #4 in the year 2017 (2017-01-21 UTC)

ATLAS 5 CENTAUR R/B, 41938 (Decayed)

SBIRS GEO 4 (USA 273) Visibility

Observer location: undefined°, undefined°

SBIRS GEO 4 (USA 273) is likely not visible in the next few days

Authenticating...

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Check out SBIRS GEO 4 (USA 273), 41937 on other resources

View SBIRS GEO 4 (USA 273), 41937 on NASA - NSSDCA Website

View SBIRS GEO 4 (USA 273), 41937 on Heavens-Above

View SBIRS GEO 4 (USA 273), 41937 on Keep Track

View SBIRS GEO 4 (USA 273), 41937 on Celestrak

View SBIRS GEO 4 (USA 273), 41937 on Gunter's Space Page

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