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CSS (Tianhe)

In orbit NORAD 48274 AYDR-6527-9294-8555-4924 China

Observations 19
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2021

Launch

19

Observations all time

Mission information
Spacecraft name
CSS (Tianhe)
Other names
Tiangong, 天和
Website
http://en.cmse.gov.cn/
Status
Active
The satellite is in orbit
The network has not received data from this satellite for a long time
Launch and timeline
Launch time
2021-04-21 00:00:00
Separation time
Satellite appearance
Data for the last 30 days
Orbital parameters of the satellite
Perigee
387.50 km
Apogee
388.17 km
Inclination
41.5°
Period
92.3 min
Semi-major axis
6766.0 km
Velocity
7.68 km/s
Orbital elements
TLE source
Celestrak
TLE updated
2026-10-14 14:09:01 UTC
Two-line elements (TLE)
1 48274U 21035A   26287.28427591  .00021633  00000-0  25637-3 0  9990
2 48274  41.4695 318.6409 0000496 117.1795 242.9094 15.60710014311760
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Orbit history, past year

Mean elements of every TLE set over the past 365 days, plotted against the epoch of the set. Each source is its own line; click it in the legend to hide it. A jump in altitude is a manoeuvre or a bad set; lines drifting apart are a disagreement between sources. “TLE age” is how many hours have passed since the epoch of the source's freshest set, plotted against when the set reached us, on a logarithmic scale. A set the source repeats unchanged does not reset the age.

Prediction divergence

Each TLE set is propagated with SGP4 to the epoch of the next set from the same source and compared with it, plotted against the epoch of the next set; the tooltip shows how many hours ahead the prediction ran. The logarithmic scale shows the size of the divergence and the tooltip its sign: plus along-track means the prediction is ahead of the satellite. This is how well the sets agree, not the true error: the reference is a TLE too, off by about a kilometre. An outlier is a manoeuvre between sets. Sets more than a week apart are not compared.

Time of closest approach, UTC Object 1 Object 2 Distance, km Speed, km/s Max. probability
2026-10-15 13:39:22 CYGFM05
NORAD 41884 		CSS (TIANHE)
NORAD 48274 		4.026 8.65 2.3e-07
2026-10-20 01:27:48 CSS (TIANHE)
NORAD 48274 		STARLINK-31096
NORAD 58592 		3.020 3.53 1.4e-05
2026-10-20 11:40:24 CSS (TIANHE)
NORAD 48274 		OBJECT A
NORAD 60745 		4.355 14.28 1.1e-07

Data: CelesTrak SOCRATES Plus, computed from TLEs of the public catalog. This is an estimate, not grounds for a manoeuvre: TLEs carry no covariance, and the maximum probability assumes a position error.

All conjunctions of this satellite