- Earth-watching satellite
- NORAD 27599
- 2002-056C
- Low Earth orbit
Current orbit
View on live mapOrbit began over the Southern Ocean
Orbit ends over Antarctica
Sunlit since
Enters the Earth’s shadow
In view from you
Nobody watches WEOS 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 WEOS, 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 Indian Ocean LIVE
Where is WEOS?
At 5:39:15 PM UTC WEOS was over the Indian Ocean (58.7° S, 135.2° E), 805 km up, moving at 7.45 km/s and in sunlight.
What is WEOS?
A satellite that watches the Earth in low Earth orbit, in space since Dec 14, 2002.
Can I see WEOS?
No, not with the naked eye: no brightness has been published for WEOS, and nothing here estimates one; what people use is its pictures and measurements of the Earth.
General
- Operator
- Chiba Institute of Technology
- State
- Japan (Nippon), State of
- Built by
- Chiba Institute of Technology
- What it is
- Earth-watching satellite
- Launched
- Mass
- 50 kg
- Operating
- No: its regular operations have ended
- 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
- 5:39 PM UTC
- Station time (UTC)
- 5:39 PM UTC
- Latitude / longitude
- 58.7° S, 135.2° E
- Altitude
- 805 km
- Speed
- 7.45 km/s (26,831 km/h)
- Course
- south
- Light
- In sunlight until 6:50 PM UTC
- Inclination
- 98.8°
- Orbital period
- 100.6 minutes
- Orbits per day
- 14.31
- This orbit
- 780 to 792 km
- In shadow
- 16 minutes of each orbit
- In view from
- Within 2,120 km of the point below it
- Elements epoch
- Nov 8, 2026, 4:47 AM, 12 hours old
- Source
- Position from Space-Track orbital elements of Nov 8, 2026, 4:47 AM, 12 hours old.
No operator publishes an ephemeris for WEOS, so every position here comes from its orbital elements.
In orbit
- Close approaches
- No close approach to WEOS 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
WEOS shares its launch, 2002-056, with 6 other bodies the catalogue lists in orbit.
| Body | What it is |
|---|---|
| ADEOS 2 | Earth-watching satellite |
| FEDSAT | Satellite |
| MICRO LABSAT | Satellite |
| H-2A R/B | Rocket body |
| RITE TARGET 1 | Satellite |
| RITE TARGET 2 | 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 |
|---|---|---|---|---|
| WEOS | 780 to 792 km | 101 minutes | 50 kg | 2002 |
| Sentinel-2A | 788 to 790 km | 101 minutes | about 1.1 t | 2015 |
| Sentinel-2B | 788 to 790 km | 101 minutes | about 1.1 t | 2017 |
| Sentinel-2C | 788 to 790 km | 101 minutes | about 1.1 t | 2024 |
| Sentinel-3A | 802 to 804 km | 101 minutes | about 1.2 t | 2016 |
| Sentinel-3B | 802 to 804 km | 101 minutes | about 1.2 t | 2018 |
Data and API
The current elements from Space-Track as an OMM object, epoch Nov 8, 2026, 4:47 AM, 12 hours old.
{
"OBJECT_NAME": "WEOS",
"OBJECT_ID": "2002-056C",
"EPOCH": "2026-11-08T04:47:22.897248",
"MEAN_MOTION": 14.30890902,
"ECCENTRICITY": 0.00085652,
"INCLINATION": 98.8376,
"RA_OF_ASC_NODE": 282.1654,
"ARG_OF_PERICENTER": 250.831,
"MEAN_ANOMALY": 109.1945,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 27599,
"ELEMENT_SET_NO": 999,
"REV_AT_EPOCH": 24694,
"BSTAR": 0.000086102125,
"MEAN_MOTION_DOT": 0.0000018,
"MEAN_MOTION_DDOT": 0
}