- Navigation satellite
- Military
- NORAD 28190
- 2004-009A
- Medium Earth orbit
Current orbit
View on live mapOrbit began over the Pacific Ocean
Orbit ends over the Atlantic Ocean
In view from you
Nobody watches NAVSTAR 54 (USA 177) 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 NAVSTAR 54 (USA 177), 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 far too high and too faint for the naked eye. What you notice of it is a position fix, and the card above says whether it is above your horizon to give you one.
Timeline
Summary
Over the Atlantic Ocean LIVE
Where is NAVSTAR 54 (USA 177)?
At 4:10:02 AM UTC NAVSTAR 54 (USA 177) was over the Atlantic Ocean (40.3° N, 51.7° W), 19,984 km up, moving at 3.9 km/s and in sunlight.
What is NAVSTAR 54 (USA 177)?
A GPS navigation satellite in medium Earth orbit, in space since Mar 20, 2004.
Can I see NAVSTAR 54 (USA 177)?
No, not with the naked eye: no brightness has been published for NAVSTAR 54 (USA 177), and nothing here estimates one; receivers on the ground use its signals instead, whenever it is above their horizon.
General
NAVSTAR 54 (USA 177) is one of the 32 navigation satellites of the GPS constellation. See every GPS satellite and how many are above you right now.
- Launched
- Known to its operator as
- PRN 19
- Space vehicle number
- 59
- Clock in use
- Rubidium
- Generation
- GPS Block IIR
- Signals
- L1 C/A and P(Y) on L1 and L2
- Design life
- 7.5 years
- Built by
- Lockheed Martin
- Typical altitude
- 20,000 to 20,400 km
Latest orbital data
- Position received
- 4:10 AM UTC
- Station time (UTC)
- 4:10 AM UTC
- Latitude / longitude
- 40.3° N, 51.7° W
- Altitude
- 19,984 km
- Speed
- 3.9 km/s (14,054 km/h)
- Course
- south-east
- Light
- In sunlight
- Inclination
- 54.7°
- Orbital period
- 717.9 minutes
- Orbits per day
- 2.01
- This orbit
- 19,879 to 20,484 km
- In shadow
- None of this orbit
- In view from
- Within 7,360 km of the point below it
- Elements epoch
- Nov 1, 2026, 6:02 AM, 1 day old
- Source
- Position from Space-Track orbital elements of Nov 1, 2026, 6:02 AM, 1 day old.
No operator publishes an ephemeris for NAVSTAR 54 (USA 177), so every position here comes from its orbital elements.
In service
A receiver can count on it now.
- Usable now
- Yes: its operator has published no outage in force.
- Plane and slot
- Plane C, slot 5
- Last outage
- Aug 20, 2026, 9:20 PM to Aug 21, 2026, 3:48 AM, forecast Notice
From GPS’s own notices, as its operator published them on Oct 30, 2026, 3:06 AM.
In orbit
- Close approaches
- No close approach to NAVSTAR 54 (USA 177) has been reported publicly in the past thirty days.
From Space-Track’s public conjunction messages; the latest report was issued Nov 2, 2026, 1:53 PM, 14 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
| Constellation | Satellites | Typical altitude | Orbital period | Planes | Operator |
|---|---|---|---|---|---|
| GPS | 32 | 20,000 to 20,400 km | 718 minutes | 6 | The United States Space Force |
| Galileo | 28 | 23,100 to 23,300 km | 845 minutes | — | EUSPA, the European Union Agency for the Space Programme |
| BeiDou | 37 | 21,450 to 21,600 km | 773 minutes | — | The China Satellite Navigation Office |
| GLONASS | 24 | 19,050 to 19,200 km | 676 minutes | — | Roscosmos, the Russian State Space Corporation |
Data and API
The current elements from Space-Track as an OMM object, epoch Nov 1, 2026, 6:02 AM, 1 day old.
{
"OBJECT_NAME": "NAVSTAR 54 (USA 177)",
"OBJECT_ID": "2004-009A",
"EPOCH": "2026-11-01T06:02:05.329248",
"MEAN_MOTION": 2.00571844,
"ECCENTRICITY": 0.0113825,
"INCLINATION": 54.7281,
"RA_OF_ASC_NODE": 270.144,
"ARG_OF_PERICENTER": 176.3791,
"MEAN_ANOMALY": 4.2703,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 28190,
"ELEMENT_SET_NO": 999,
"REV_AT_EPOCH": 16569,
"BSTAR": 0,
"MEAN_MOTION_DOT": -1.8e-7,
"MEAN_MOTION_DDOT": 0
}