Key statistics
Satellite DELTA 2 R/B(1) at a glance.
Uptime
10148
Days in orbit
Revolutions
≈ 13.6
Per day
Orbit
LEO
Low Earth Orbit
Inclination
26.9
Latest
Satellite identification and parameters
Extended collection of information and parameters for DELTA 2 R/B(1).
Object identification
Identified? True
Debris? False
Object name: DELTA 2 R/B(1)
International designator: 1998-002B
Object number (NORAD): 25135
Object ID (CCSDS): 25135
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 105.67 minutes
Inclination: 26.8853 deg
SMA: 7403.899 km
Apoapsis: 1288.731 km
Periapsis: 762.798 km
RAAN: 209.3662 deg
Eccentricy: 0.03551727
Argument of periapsis: 267.6154 deg
Mean anomaly: 258.8909 deg
Mean motion: 13.62736878 rev/day
Mean motion (dot): 0.00000186 rev/day2
B* drag term: 0.000055479352 1/REarth
Two-line elements (TLE)
Creation date: Oct. 21, 2025, 6:24 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 21, 2025, 12:16 p.m. UTC
TLE line 0: 0 DELTA 2 R/B(1)
TLE line 1: 1 25135U 98002B 25294.51178611 .00000186 00000-0 55479-4 0 9996
TLE line 2: 2 25135 26.8853 209.3662 0355173 267.6154 258.8909 13.62736878384291
Live tracking on map
Real-time ground track for satellite DELTA 2 R/B(1).
In-orbit conjunctions
A list of the most updated potential collisions computed for object DELTA 2 R/B(1).
Associated space launch
Skynet 4 was the third generation of UK Ministry of Defense communications satellites. They provided jam-proof communications service between fixed and mobile land and sea-based ground stations.
DELTA 2 R/B(1) was lifted into orbit during the mission ‘Delta II | Skynet 4D’, on board a Delta II space rocket.
The launch took place on Jan. 10, 1998, 12:32 a.m. from Space Launch Complex 17B.
For more information about the launch, click the button.
Delta II | Skynet 4D
Agency: N/A
Status: Launch Successful
Launch date: Jan. 10, 1998, 12:32 a.m. UTC
Rocket: Delta II
Launch pad: Space Launch Complex 17B
Location: Cape Canaveral SFS, FL, USA
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