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LDPE-1, 49818

Orbit data source: Space-Track

LDPE-1, 49818 is a payload satellite owned by AFRL/RV (US) in GEO that was launched on Tue, 07 Dec 2021 UTC via an ATLAS V 551 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/49818?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/49818?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

49818, 2021-118B

Orbit

GEO

Country

Related business

United States Air Force (US)

Manufacturer

NGIS

Mission

Operational Defense Technology

Bus & Motor

ESPASTAR, Unknown motor

Mass

~500 kg wet, 500 kg dry

Launch date (UTC)

2021-12-07 (4 years ago)

Launch vehicle

ATLAS V 551

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl + 1 Pan, 1.8 m

Radar Cross Section

3.054 m², Large (>1 m²)

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

TLE from 13 hours ago

0 LDPE-1
1 49818U 21118B   25351.77976374 -.00000129  00000-0  00000-0 0  9992
2 49818   3.2905  81.0702 0004102 239.8980  99.1570  1.01746804 14822

Epoch: 2025-12-17T18:42Z

TLE epoch observation values (Epoch: 2025-12-17T18:42:51.587Z)

Latitude

-1.15034°

Longitude

52.83494°

Altitude

35,380.543 km

Speed

3.09 km/s

True Right ascension

04h 00m 46s

True Declination

-1° 08' 57"

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

06:42:00

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,396.301 km

Perigee altitude

35,362.043 km

Semi-major axis

41,757.309 km

Eccentricity

0.00041

Inclination

3.2905°

RAAN

81.0702°

Arg. of periapsis

239.898°

True anomaly

99.2034°

Mean anomaly

99.157°

Eccentric anomaly

99.1802°

Mean motion

0.25436 °/min

Orbital period

1,415.33 mins

BSTAR

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Other satellites on launch #118 in the year 2021 (2021-12-07 UTC)

ATLAS 5 CENTAUR R/B, 49819

ASCENT, 51287

STPSAT-6, 49817

ATLAS 5 CENTAUR DEB, 50214

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LDPE-1 Visibility

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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.
LDPE-1 is likely not visible in the next few days.

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49818 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 LDPE-1, 49818 on other resources

View LDPE-1, 49818 on NASA - NSSDCA Website

View LDPE-1, 49818 on Heavens-Above

View LDPE-1, 49818 on Keep Track

View LDPE-1, 49818 on Celestrak

View LDPE-1, 49818 on Gunter's Space Page

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

LDPE-1, 49818

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: 2025-12-17T18:42:51.587Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #118 in the year 2021 (2021-12-07 UTC)

LDPE-1 Visibility

49818 neighbors

Co-orbital & Co-planar RSOs

Check out LDPE-1, 49818 on other resources

Documentation

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