Conjunction Event Detail

    Extreme Risk
    Extreme collision probability. Maneuver strongly recommended for primary asset.
    1.456159E-3
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-12T08:23:34+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 65338
    NORAD ID 65338
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-34751
    Time of Closest Approach 2026-09-13T16:19:38+0000
    Collision Probability (Pc) 1.456159E-3
    Conjunction Distance (km) 0.047 km
    Relative Speed (km/s) 10.705 km/s
    Conjunction Risk Parameters R (Radial): 0.028 | I (In-track): -0.029 | C (Cross-track): 0.023
    Collision Risk Index (CRI) 0.98
    X Position (km) -3989.447 -3989.493
    Position Y (km) -5557.358 -5557.359
    Position Z (km) -348.155 -348.155
    Velocity X (km/s) 4.886 3.897
    Velocity Y (km/s) -3.803 -2.424
    Velocity Z (km/s) 4.473 -6.097

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-34751
    Semimajor Axis (a) 6860.947 km 6848.854 km
    Eccentricity (e) 0.002676 0.000085
    Inclination (i) 35.9895° 53.1583°
    RAAN 252.2428° 61.1072°
    Perigee Argument 279.8275° 86.3178°
    Mean Anomaly (M) 79.9437° 273.7920°
    Apogee 501.172 km 471.300 km
    Perigee 464.448 km 470.134 km
    Orbit Epoch 2026-09-11T11:01:09+0000 2026-09-11T18:06:59+0000

    SHIYAN 21 (SY-21) & STARLINK-34751 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-34751 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-34751 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-34751 Miss Distance (Miss Distance) TrendNot Available

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

    Object 1 Miss Distance TrendNot Available

    STARLINK-34751Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-34751Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data