PORCUPINE 2, 1577
Orbit data source: Space-Track
PORCUPINE 2, 1577 is a payload satellite owned by NRL (US) in LEO that was launched on Fri, 13 Aug 1965 UTC via a THOR ABLESTAR 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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1577 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
NRL
Mission
Defense Calibration
Bus & Motor
SURCAL, Unknown motor
Mass
5 kg wet, 5 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Box, 0.1 m
Radar Cross Section
0.060 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 15 hours ago
TLE from 15 hours ago
0 PORCUPINE 2
1 01577U 65065J 25259.93652606 .00000121 00000-0 21495-3 0 9990
2 01577 90.0153 211.4236 0070735 153.1412 278.5511 13.36190956926164Epoch: 2025-09-16T22:28Z
TLE epoch observation values (Epoch: 2025-09-16T22:28:35.851Z)
Latitude
70.95675°
Longitude
-121.88955°
Altitude
1,128.322 km
Speed
7.298 km/s
True Right ascension
14h 05m 31s
True Declination
70° 51' 20"
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
06:00:19
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,173.614 km
Perigee altitude
1,067.53 km
Semi-major axis
7,498.709 km
Eccentricity
0.00707
Inclination
90.0153°
RAAN
211.4236°
Arg. of periapsis
153.1412°
True anomaly
277.74852°
Mean anomaly
278.5511°
Eccentric anomaly
278.14991°
Mean motion
3.34244 °/min
Orbital period
107.71 mins
BSTAR
0.00021495
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Other satellites on launch #65 in the year 1965 (1965-08-13 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.PORCUPINE 2 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. |
|---|---|---|---|---|---|---|---|
| 9 mins | 2025-09-17 19:49:53.282Z | 115.141° SE | 2025-09-17 19:53:53.282Z | 76.081° E | 20.776° | 2025-09-17 19:58:53.282Z | 27.525° NE |
| 12 mins | 2025-09-17 21:35:53.282Z | 193.733° SSW | 2025-09-17 21:40:53.282Z | 261.695° W | 41.475° | 2025-09-17 21:47:53.282Z | 351.058° N |
| 11 mins | 2025-09-18 08:52:53.282Z | 10.578° NNE | 2025-09-18 08:57:53.282Z | 85.989° E | 42.589° | 2025-09-18 09:03:53.282Z | 171.748° S |
| 7 mins | 2025-09-18 10:41:53.282Z | 319.03° NNW | 2025-09-18 10:44:53.282Z | 287.375° WNW | 18.101° | 2025-09-18 10:48:53.282Z | 248.175° W |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in ascending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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