- Communications satellite
- Military
- NORAD 20547
- 1990-028B
- Low Earth orbit
Current orbit
View on live mapOrbit began over the Southern Ocean
Orbit ends over the Southern Ocean
Sunlit since
Enters the Earth’s shadow
In view from you
Nobody watches USA 55 go over, but a receiver still asks whether it is above the horizon. Say where you are and this card answers.
Your position is rounded to about a kilometre and sent only to the Orbinauts API, to find the pass.
No brightness has been published for USA 55, so it is not a naked-eye satellite and no city page carries pass times for it. Nothing here estimates one.
Seeing it
There is nothing to go outside for: it is too faint for the naked eye. What reaches you from it reaches a dish or an antenna, not an eye.
Timeline
- Launch
Launched, on the day GCAT records. Source
Summary
Over Canada LIVE
Where is USA 55?
At 6:20:07 PM UTC USA 55 was over Canada (66.9° N, 107.5° W), 463 km up, moving at 7.63 km/s and in sunlight.
What is USA 55?
A communications satellite in low Earth orbit, in space since Apr 5, 1990.
Can I see USA 55?
No, not with the naked eye: no brightness has been published for USA 55, and nothing here estimates one; the dishes and receivers on the ground use its signals instead.
General
- Operator
- Defense Advanced Research Projects Agency
- State
- United States of America
- Built by
- Defense Systems Inc
- What it is
- Communications satellite
- Military
- Yes: a defence organisation flies it
- Launched
- Mass
- 68 kg
- Operating
- Orbit class
- Low Earth orbit
From GCAT, Jonathan McDowell’s general catalogue, licensed CC BY 4.0: the operator, the state, the manufacturer, what it is for, that a defence organisation flies it, the launch day, the mass, and whether it is operating. The orbit class is read from its current elements.
Latest orbital data
- Position received
- 6:20 PM UTC
- Station time (UTC)
- 6:20 PM UTC
- Latitude / longitude
- 66.9° N, 107.5° W
- Altitude
- 463 km
- Speed
- 7.63 km/s (27,464 km/h)
- Course
- north
- Light
- In sunlight until 6:27 PM UTC
- Inclination
- 94.1°
- Orbital period
- 93.2 minutes
- Orbits per day
- 15.46
- This orbit
- 392 to 461 km
- In shadow
- 36 minutes of each orbit
- In view from
- Within 1,480 km of the point below it
- Elements epoch
- Nov 8, 2026, 7:10 AM, 11 hours old
- Source
- Position from Space-Track orbital elements of Nov 8, 2026, 7:10 AM, 11 hours old.
No operator publishes an ephemeris for USA 55, so every position here comes from its orbital elements.
In orbit
- Close approaches
- No close approach to USA 55 has been reported publicly in the past thirty days.
From Space-Track’s public conjunction messages; the latest report was issued Nov 8, 2026, 1:11 PM, 3 hours old. Only approaches serious enough to be reported publicly are listed: within three days and, for two bodies near the Earth, closer than a kilometre with a chance of a collision above 1 in 10,000, the level at which NASA moves the ISS.
Beside the others
| Satellite | Typical altitude | Orbital period | Mass | In space since |
|---|---|---|---|---|
| USA 55 | 392 to 461 km | 93 minutes | 68 kg | 1990 |
| BlueWalker 3 | 443 to 453 km | 94 minutes | about 1.5 t | 2022 |
| Hispasat 30W-6 | 35,786 to 35,786 km | 1,436 minutes | about 6.1 t | 2018 |
| Amazonas Nexus | 35,786 to 35,786 km | 1,436 minutes | about 4.1 t | 2023 |
| ARSAT-1 | 35,786 to 35,786 km | 1,436 minutes | about 3 t | 2014 |
| Astra 1N | 35,786 to 35,786 km | 1,436 minutes | about 5.3 t | 2011 |
Data and API
The current elements from Space-Track as an OMM object, epoch Nov 8, 2026, 7:10 AM, 11 hours old.
{
"OBJECT_NAME": "USA 55",
"OBJECT_ID": "1990-028B",
"EPOCH": "2026-11-08T07:10:06.751200",
"MEAN_MOTION": 15.4555006,
"ECCENTRICITY": 0.00508449,
"INCLINATION": 94.1032,
"RA_OF_ASC_NODE": 224.8505,
"ARG_OF_PERICENTER": 299.9497,
"MEAN_ANOMALY": 59.6716,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 20547,
"ELEMENT_SET_NO": 999,
"REV_AT_EPOCH": 2411,
"BSTAR": 0.0001853176,
"MEAN_MOTION_DOT": 0.00009317,
"MEAN_MOTION_DDOT": 0
}