- Earth-watching satellite
- TIANHUI 4B
- NORAD 50573
- 2021-134B
- Low Earth orbit
Current orbit
View on live mapOrbit began over the Coral Sea
Orbit ends over Australia
Sunlit since
Enters the Earth’s shadow
In view from you
Nobody watches Tianhui-4 02 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 Tianhui-4 02, 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 it is up there for reaches the ground as pictures and measurements, not as a light in the sky.
Timeline
- Launch
Launched, on the day GCAT records. Source
Summary
Over the Atlantic Ocean LIVE
Where is Tianhui-4 02?
At 6:21:50 PM UTC Tianhui-4 02 was over the Atlantic Ocean (24.4° S, 21.8° W), 434 km up, moving at 7.65 km/s and in sunlight.
What is Tianhui-4 02?
A satellite that watches the Earth in low Earth orbit, in space since Dec 29, 2021.
Can I see Tianhui-4 02?
No, not with the naked eye: no brightness has been published for Tianhui-4 02, and nothing here estimates one; what people use is its pictures and measurements of the Earth.
General
- Operator
- State Surveying and Mapping Geographic Information Bureau
- State
- China, People's Republic of
- Built by
- Spaceflight East Is Red Satellite Co
- What it is
- Earth-watching satellite
- Launched
- Mass
- about 1 t
- Operating
- Yes
- 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, the launch day, the mass, and whether it is operating. The orbit class is read from its current elements.
Latest orbital data
- Position received
- 6:21 PM UTC
- Station time (UTC)
- 6:21 PM UTC
- Latitude / longitude
- 24.4° S, 21.8° W
- Altitude
- 434 km
- Speed
- 7.65 km/s (27,533 km/h)
- Course
- north
- Light
- In sunlight until 6:55 PM UTC
- Inclination
- 89°
- Orbital period
- 93 minutes
- Orbits per day
- 15.48
- This orbit
- 415 to 423 km
- In shadow
- 10 minutes of each orbit
- In view from
- Within 1,420 km of the point below it
- Elements epoch
- Nov 8, 2026, 6:03 AM, 12 hours old
- Source
- Position from Space-Track orbital elements of Nov 8, 2026, 6:03 AM, 12 hours old.
No operator publishes an ephemeris for Tianhui-4 02, so every position here comes from its orbital elements.
In orbit
- Close approaches
- No close approach to Tianhui-4 02 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.
Launched with
Tianhui-4 02 shares its launch, 2021-134, with one other body the catalogue lists in orbit.
| Body | What it is |
|---|---|
| TIANHUI 4A | Earth-watching satellite |
Read from the international designators of the US catalogue: the year and the launch number every piece of one launch shares. A body that has come down is no longer listed.
Beside the others
| Satellite | Typical altitude | Orbital period | Mass | In space since |
|---|---|---|---|---|
| Tianhui-4 02 | 415 to 423 km | 93 minutes | about 1 t | 2021 |
| PAZ | 507 to 510 km | 95 minutes | about 1.4 t | 2018 |
| WorldView-3 | 612 to 615 km | 97 minutes | about 2.8 t | 2014 |
| SAOCOM 1A | 622 to 624 km | 97 minutes | about 3 t | 2018 |
| ALOS-2 | 630 to 632 km | 97 minutes | about 2.1 t | 2014 |
| SMAP | 681 to 683 km | 98 minutes | 944 kg | 2015 |
Data and API
The current elements from Space-Track as an OMM object, epoch Nov 8, 2026, 6:03 AM, 12 hours old.
{
"OBJECT_NAME": "TIANHUI 4B",
"OBJECT_ID": "2021-134B",
"EPOCH": "2026-11-08T06:03:29.570112",
"MEAN_MOTION": 15.4817957,
"ECCENTRICITY": 0.00054381,
"INCLINATION": 88.962,
"RA_OF_ASC_NODE": 302.1185,
"ARG_OF_PERICENTER": 197.0435,
"MEAN_ANOMALY": 163.0644,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 50573,
"ELEMENT_SET_NO": 999,
"REV_AT_EPOCH": 27211,
"BSTAR": 0.00018178376,
"MEAN_MOTION_DOT": 0.00009589,
"MEAN_MOTION_DDOT": 0
}