LEMUR 2 MONSON, 42839
Orbit data source: Space-Track
LEMUR 2 MONSON, 42839 is a payload satellite owned by Spire (US) in SSO that was launched on Fri, 14 Jul 2017 UTC via a SOYUZ-2-1A launch vehicle from the Tyuratam Missile And Space Complex (TTMTR). 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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42839 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
Spire/Glasgow
Mission
Operational Commercial Com/MetRO
Bus & Motor
CUBESAT 3U, Unknown motor
Mass
4 kg wet, 4 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box, 0.5 m
Radar Cross Section
0.093 m², Small (<0.1 m²)
Expand to show TLE details & historyLast TLE update: 13 hours ago
TLE from 13 hours ago
0 LEMUR 2 MONSON
1 42839U 17042Q 25287.25906088 .00015707 00000-0 74520-3 0 9993
2 42839 97.3996 106.0164 0008483 137.1787 223.0110 15.19322996450719Epoch: 2025-10-14T06:13Z
TLE epoch observation values (Epoch: 2025-10-14T06:13:02.860Z)
Latitude
0.00001°
Longitude
-10.29558°
Altitude
515.25 km
Speed
7.604 km/s
True Right ascension
07h 04m 03s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
13:38:30
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
510.691 km
Perigee altitude
499.013 km
Semi-major axis
6,882.989 km
Eccentricity
0.00085
Inclination
97.3996°
RAAN
106.0164°
Arg. of periapsis
137.1787°
True anomaly
222.94474°
Mean anomaly
223.011°
Eccentric anomaly
222.97787°
Mean motion
3.80082 °/min
Orbital period
94.72 mins
BSTAR
0.0007452
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Other satellites on launch #42 in the year 2017 (2017-07-14 UTC)
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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.LEMUR 2 MONSON 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. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2025-10-15 00:10:40.122Z | 43.792° NE | 2025-10-15 00:13:40.122Z | 103.43° ESE | 21.333° | 2025-10-15 00:15:40.122Z | 142.647° SSE |
| 4 mins | 2025-10-15 01:45:40.122Z | 322.044° NNW | 2025-10-15 01:46:40.122Z | 301.724° NW | 18.753° | 2025-10-15 01:49:40.122Z | 244.225° WSW |
| 6 mins | 2025-10-15 12:22:40.122Z | 187.863° SSW | 2025-10-15 12:25:40.122Z | 277.173° WNW | 37.106° | 2025-10-15 12:28:40.122Z | 335.865° NNW |
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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