Conjunction Event Detail

    Very Low Risk
    Very low collision probability. Continue monitoring.
    4.578136E-7
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-13T00:43:29+0800
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    1 Object 1

    AOE ID 20912
    NORAD ID 20912
    Object Type DEBRIS
    Country
    CN CN
    VS

    2 Object 2

    AOE ID 43249
    NORAD ID 43249
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter CZ-4 DEB IRIDIUM 144
    Time of Closest Approach 2026-09-12T18:09:07+0000
    Collision Probability (Pc) 4.578136E-7
    Conjunction Distance (km) 2.791 km
    Relative Speed (km/s) 1.589 km/s
    Conjunction Risk Parameters R (Radial): -0.492 | I (In-track): 2.73 | C (Cross-track): -0.298
    Collision Risk Index (CRI) 0.28
    X Position (km) 1943.212 1943.305
    Position Y (km) 6847.673 6848.461
    Position Z (km) -768.313 -765.638
    Velocity X (km/s) 0.858 -0.669
    Velocity Y (km/s) -1.057 -0.629
    Velocity Z (km/s) -7.332 -7.406

    Orbital Parameters 国际轨道数据源

    Parameter CZ-4 DEB IRIDIUM 144
    Semimajor Axis (a) 7146.162 km 7155.805 km
    Eccentricity (e) 0.001349 0.000219
    Inclination (i) 98.5487° 86.3907°
    RAAN 254.3015° 254.0473°
    Perigee Argument 17.1623° 88.1872°
    Mean Anomaly (M) 37.2474° 271.9574°
    Apogee 777.668 km 779.234 km
    Perigee 758.382 km 776.102 km
    Orbit Epoch 2026-09-11T23:09:37+0000 2026-09-12T02:13:03+0000

    CZ-4 DEB & IRIDIUM 144 Collision Probability (Pc) Trend

    CZ-4 DEB & IRIDIUM 144 Collision Probability (Pc) TrendNot Available

    CZ-4 DEB & IRIDIUM 144 Miss Distance (Miss Distance) Trend

    CZ-4 DEB & IRIDIUM 144 Miss Distance (Miss Distance) TrendNot Available

    CZ-4 DEBMiss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    IRIDIUM 144Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    CZ-4 DEBCollision Probability Trend

    Object 1 Probability TrendNot Available

    IRIDIUM 144Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with CZ-4 DEB

    No nearby objects data