SHIYAN-21 (SY-21) is a payload in LEO orbit, operated by Chinese Academy of Space Technology, Beijing (CASC 5th Acad), launched 2022.
| Orbit class | LEO |
| Inclination | 35.9859° |
| Eccentricity | 0.0026661 |
| Period | 94.3 min |
| Apogee | 502 km |
| Perigee | 465 km |
| Mean motion | 15.27355378 rev/day |
| RAAN | 309.2103° |
| Arg of perigee | 57.3737° |
| Mean anomaly | 302.9565° |
| B* | 2.1984e-4 |
| Rev at epoch | 19,868 |
1 54752U 22172A 26187.78918310 .00006026 00000-0 21984-3 0 99992 54752 35.9859 309.2103 0026661 57.3737 302.9565 15.27355378198683{
"OBJECT_NAME": "SHIYAN-21 (SY-21)",
"OBJECT_ID": "2022-172A",
"EPOCH": "2026-07-06T18:56:25.42+00:00",
"MEAN_MOTION": 15.27355378,
"ECCENTRICITY": 0.0026661,
"INCLINATION": 35.9859,
"RA_OF_ASC_NODE": 309.2103,
"ARG_OF_PERICENTER": 57.3737,
"MEAN_ANOMALY": 302.9565,
"EPHEMERIS_TYPE": 0,
"CLASSIFICATION_TYPE": "U",
"NORAD_CAT_ID": 54752,
"REV_AT_EPOCH": 19868,
"BSTAR": 0.00021984,
"MEAN_MOTION_DOT": 0.00006026,
"MEAN_MOTION_DDOT": 0
}Reconstructed from CelesTrak OMM mean-elements (element-set number is a placeholder). TLE/OMM data is approximate. Not for operational use or collision avoidance.
| Name | SHIYAN-21 (SY-21) |
| Operator | Chinese Academy of Space Technology, Beijing (CASC 5th Acad)HIGHvia GCAT — Jonathan McDowell's General Catalog |
| Country | China |
| Launch date | |
| Launch mass (kg) | |
| Mission purpose | — |
| Object class | PAYLOADHIGH |
//Orbital data is approximate and not for operational use. Last ingested from CelesTrak on Jul 7, 2026.
| Orbital regime |
| Status |