Space Brief 27 Mar 2025
Today's highlights include the certification of ULA's Vulcan rocket for national security missions, developments in nuclear timekeeping for GPS systems, and updates on the Space Force's new warfighting framework.
NAVSTAR 54 (USA 177) (28190)
COSPAR: 2004-009A | Alt Name: GPS IIR-11
Image
Additional Sources
Launch Details
Launch Date
March 20, 2004
Launch Site
Launch Pad
SLC17B
Launch Vehicle
Delta 7925-9.5
Orbital Elements
NORAD ID
28190
International Designator
2004-009A
Epoch
Wed, 01 Jul 2026 22:09:02 GMT
Apogee
Calculating...
Perigee
Calculating...
Inclination
54.82°
Right Ascension
275.09°
Eccentricity
Calculating...
Argument of Perigee
173.76°
Period
718.01 min
Mean Motion
2.01 rev/day
Latitude
Calculating...
Longitude
Calculating...
Altitude
Calculating...
Velocity
Calculating...
Polar Plot
3D Visualization
Basic Satellite Info
Name
NAVSTAR 54 (USA 177)
Alternative Name
GPS IIR-11
Type
Payload
Status
Operational
Owner
AFSMC
Country
United States
Constellation
N/A
Related Satellites
Major Events
N/A
Latest TLEs
1 28190U 04009A 26182.92294126 -.00000019 00000-0 00000-0 0 9998
2 28190 54.8173 275.0916 0116696 173.7601 238.6833 2.00554338163243
Source: Celestrak
Summary
NAVSTAR 54 (USA 177), also known as GPS IIR-11, is a US satellite manufactured by LMMS and launched on March 20, 2004, from the Air Force Eastern Test Range (AFETR) at SLC17B using a Delta 7925-9.5 launch vehicle. It has dimensions of 1.5 meters in length, 1.9 meters in diameter, and a span of 19.3 meters when its solar arrays are deployed. The satellite's dry mass is 910 kg, with a launch mass of 1077 kg. It is part of the GPS constellation (GPS SVN 59) and serves navigation purposes. Its power source includes two deployable solar arrays and batteries. NAVSTAR 54 has a mission lifetime of 10 years and employs a Star 37XFP motor for propulsion. The satellite's shape consists of a box structure with two panels, and it features an RCS (Reaction Control System) value of 7.9432. It is owned by AFSMC and operates under the configuration AS-4000 within the Series 4000 bus family.
Physical Characteristics
Length
1.5
Diameter
1.9
Span
19.3
Dry Mass
910
Launch Mass
1077
Shape
Box + 2 Pan
Radar Cross Section
7.9432
Visual Magnitude
Unknown
Color
Unknown
Material Composition
Unknown
Technical Details
Payload
GPS SVN 59
Purpose
Navigation
Mission
Navigation
Manufacturer
LMMS
Life Expectancy
10 years
Bus
Series 4000
Configuration
AS-4000
Motor
Star 37XFP
Equipment
?
Power System
2 deployable solar arrays, batteries
ADCS
Unknown
Transmitter Frequency
Unknown
Map
Next Pass
Azimuth Elevation Time (Local)
Start Azimuth
Max Elevation
Stop Azimuth
Time Until
Pass Duration
Satellite Articles
View All Posts »Learn more about satellites and other related topics.
X Report 29 May 2025
SpaceX made strides in both Starship and Starlink missions this week, launching another round of satellites while concurrently testing their Starship capabilities amidst challenges.
2nd Starlink Debris Event in 3 Months Raises Alarm | KeepTrack X Report
A second Starlink satellite has generated on-orbit debris in just over 3 months, threatening SpaceX's 10,151-satellite working constellation.
Space Brief 26 Jan 2025
Spacewalks have resumed on the ISS, while Blue Origin prepares for a unique New Shepard mission. In other news, astronomers push for a ban on space ads and potential budget cuts threaten the JWST.
X Report 7 Nov 2024
SpaceX prepares for sixth Starship flight, slated for mid-November, following successful fifth test in October.
Space Brief 14 Nov 2025
Today's brief covers Firefly's acquisition, military tracking from the moon, France's boost in military space funding, and more.
Space Brief 28 Apr 2025
Today's highlights include SpaceX's 250th Starlink mission, a key Senate vote for NASA's next administrator, and insights into satellite missions and movements.
Space Brief 17 Nov 2025
Today's highlights include key advancements for the Dream Chaser, SpaceX's record launches, Moon mission crowding concerns, and updates in European space policy.