- Space telescope
- OBJECT B
- NORAD 49316
- 2021-091B
- 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 Xihe 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 Xihe, 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 far too faint for the naked eye, and catching it would take a telescope driven to follow a point crossing the sky in minutes. What is worth looking at is what it sends back.
Timeline
- Launch
Launched, on the day GCAT records. Source
Summary
Over Libya LIVE
Where is Xihe?
At 4:41:25 PM UTC Xihe was over Libya (31.8° N, 24.5° E), 515 km up, moving at 7.61 km/s and in sunlight.
What is Xihe?
A space telescope in low Earth orbit, in space since Oct 14, 2021.
Can I see Xihe?
No, not with the naked eye: no brightness has been published for Xihe, and nothing here estimates one; what people use is what it sees, which its operator publishes.
General
- Operator
- Nanjing University
- State
- China, People's Republic of
- Built by
- Shanghai Academy of Space Technology (CASC 8th Acad)
- What it is
- Space telescope
- Launched
- Mass
- 500 kg
- 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
- 4:41 PM UTC
- Station time (UTC)
- 4:41 PM UTC
- Latitude / longitude
- 31.8° N, 24.5° E
- Altitude
- 515 km
- Speed
- 7.61 km/s (27,389 km/h)
- Course
- south
- Light
- In sunlight until 5:57 PM UTC
- Inclination
- 97.4°
- Orbital period
- 94.8 minutes
- Orbits per day
- 15.19
- This orbit
- 497 to 513 km
- In shadow
- 13 minutes of each orbit
- In view from
- Within 1,590 km of the point below it
- Elements epoch
- Nov 8, 2026, 8:08 AM, 8 hours old
- Source
- Position from Space-Track orbital elements of Nov 8, 2026, 8:08 AM, 8 hours old.
No operator publishes an ephemeris for Xihe, so every position here comes from its orbital elements.
In orbit
- Close approaches
- No close approach to Xihe 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
Xihe shares its launch, 2021-091, with 2 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.
Beside the others
| Satellite | Typical altitude | Orbital period | Mass | In space since |
|---|---|---|---|---|
| Xihe | 497 to 513 km | 95 minutes | 500 kg | 2021 |
| Fermi | 488 to 498 km | 94 minutes | about 4.3 t | 2008 |
| Hubble | 465 to 480 km | 94 minutes | about 12.2 t | 1990 |
| Cheops | 679 to 694 km | 98 minutes | 280 kg | 2019 |
| XMM-Newton | 29,443 to 91,682 km | 2,873 minutes | about 3.8 t | 1999 |
| Chandra | 12,186 to 136,630 km | 3,809 minutes | about 4.8 t | 1999 |
Data and API
The current elements from Space-Track as an OMM object, epoch Nov 8, 2026, 8:08 AM, 8 hours old.
{
"OBJECT_NAME": "OBJECT B",
"OBJECT_ID": "2021-091B",
"EPOCH": "2026-11-08T08:08:09.438432",
"MEAN_MOTION": 15.19174537,
"ECCENTRICITY": 0.00115893,
"INCLINATION": 97.4433,
"RA_OF_ASC_NODE": 137.8053,
"ARG_OF_PERICENTER": 257.6216,
"MEAN_ANOMALY": 102.3722,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 49316,
"ELEMENT_SET_NO": 999,
"REV_AT_EPOCH": 28086,
"BSTAR": 0.00018428966,
"MEAN_MOTION_DOT": 0.00003813,
"MEAN_MOTION_DDOT": 0
}