Conjunction Event Detail

    ⚠
    Medium Risk
    Monitor closely. Maneuver recommended for primary asset.
    1.08846E-5
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-19T06:45:20+0800
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    1 Object 1

    AOE ID 54752
    NORAD ID 54752
    Object Type PAYLOAD
    Country
    CN CN
    ← VS →

    2 Object 2

    AOE ID 66973
    NORAD ID 66973
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-35778
    Time of Closest Approach 2026-10-20T22:16:32+0000
    Collision Probability (Pc) 1.08846E-5
    Conjunction Distance (km) 1.194 km
    Relative Speed (km/s) 9.693 km/s
    Conjunction Risk Parameters R (Radial): -0.345 | I (In-track): -0.879 | C (Cross-track): -0.728
    Collision Risk Index (CRI) 0.56
    X Position (km) 6778.224 6778.399
    Position Y (km) 1016.159 1017.338
    Position Z (km) 285.008 284.957
    Velocity X (km/s) -1.085 -0.609
    Velocity Y (km/s) 6.08 5.552
    Velocity Z (km/s) 4.473 -5.193

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-35778
    Semimajor Axis (a) 6859.494 km 6861.145 km
    Eccentricity (e) 0.002576 0.000029
    Inclination (i) 35.9927° 42.9965°
    RAAN 19.5614° 206.7917°
    Perigee Argument 247.9565° 100.5324°
    Mean Anomaly (M) 111.8432° 259.5561°
    Apogee 499.030 km 483.206 km
    Perigee 463.684 km 482.810 km
    Orbit Epoch 2026-10-18T15:22:40+0000 2026-10-18T03:36:01+0000

    SHIYAN 21 (SY-21) & STARLINK-35778 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-35778 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-35778 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-35778 Miss Distance (Miss Distance) TrendNot Available

    SHIYAN 21 (SY-21)Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    STARLINK-35778Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-35778Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data