- CS1
- NORAD 49261
- 2021-088B
- Low Earth orbit
Current orbit
View on live mapOrbit began over Antarctica
Orbit ends over Antarctica
Sunlit since
Enters the Earth’s shadow
In view from you
Nobody watches Cesium Satellite 1 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 Cesium Satellite 1, 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 to see with the naked eye from anywhere on Earth.
Timeline
- Launch
Launched, on the day GCAT records. Source
Summary
Over Antarctica LIVE
Where is Cesium Satellite 1?
At 4:54:15 PM UTC Cesium Satellite 1 was over Antarctica (72.9° S, 99.5° E), 471 km up, moving at 7.63 km/s and in sunlight.
What is Cesium Satellite 1?
A satellite in low Earth orbit, in space since Sep 27, 2021.
Can I see Cesium Satellite 1?
No, not with the naked eye: no brightness has been published for Cesium Satellite 1, and nothing here estimates one.
General
- Operator
- Cesium Astro, Inc.
- State
- United States of America
- Built by
- Cesium Astro, Inc.
- Launched
- Mass
- 10 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, the launch day, the mass, and whether it is operating. The orbit class is read from its current elements.
Latest orbital data
- Position received
- 4:54 PM UTC
- Station time (UTC)
- 4:54 PM UTC
- Latitude / longitude
- 72.9° S, 99.5° E
- Altitude
- 471 km
- Speed
- 7.63 km/s (27,479 km/h)
- Course
- north-west
- Light
- In sunlight until 5:00 PM UTC
- Inclination
- 97.4°
- Orbital period
- 93.6 minutes
- Orbits per day
- 15.38
- This orbit
- 441 to 454 km
- In shadow
- 34 minutes of each orbit
- In view from
- Within 1,500 km of the point below it
- Elements epoch
- Nov 8, 2026, 3:10 AM, 13 hours old
- Source
- Position from Space-Track orbital elements of Nov 8, 2026, 3:10 AM, 13 hours old.
No operator publishes an ephemeris for Cesium Satellite 1, so every position here comes from its orbital elements.
In orbit
- Close approaches
- No close approach to Cesium Satellite 1 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
Cesium Satellite 1 shares its launch, 2021-088, with 3 other bodies the catalogue lists in orbit.
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.
Data and API
The current elements from Space-Track as an OMM object, epoch Nov 8, 2026, 3:10 AM, 13 hours old.
{
"OBJECT_NAME": "CS1",
"OBJECT_ID": "2021-088B",
"EPOCH": "2026-11-08T03:10:37.895520",
"MEAN_MOTION": 15.38392812,
"ECCENTRICITY": 0.00092352,
"INCLINATION": 97.3599,
"RA_OF_ASC_NODE": 15.6503,
"ARG_OF_PERICENTER": 284.2814,
"MEAN_ANOMALY": 75.7405,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 49261,
"ELEMENT_SET_NO": 999,
"REV_AT_EPOCH": 28252,
"BSTAR": 0.00064367389,
"MEAN_MOTION_DOT": 0.00024367,
"MEAN_MOTION_DDOT": 0
}