Conjunction Event Detail

    Low Risk
    Low collision probability. Continue monitoring.
    7.266595E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-16T07:04:17+0800
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    1 Object 1

    AOE ID 20903
    NORAD ID 20903
    Object Type DEBRIS
    Country
    CN CN
    VS

    2 Object 2

    AOE ID 43927
    NORAD ID 43927
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter CZ-4 DEB IRIDIUM 172
    Time of Closest Approach 2026-09-16T22:41:56+0000
    Collision Probability (Pc) 7.266595E-6
    Conjunction Distance (km) 1.262 km
    Relative Speed (km/s) 7.134 km/s
    Conjunction Risk Parameters R (Radial): 0.018 | I (In-track): -1.111 | C (Cross-track): 0.596
    Collision Risk Index (CRI) 0.52
    X Position (km) -787.119 -787.48
    Position Y (km) 1397.751 1398.923
    Position Z (km) 6964.746 6964.452
    Velocity X (km/s) 1.554 -5.248
    Velocity Y (km/s) 7.193 5.062
    Velocity Z (km/s) -1.305 -1.607

    Orbital Parameters 国际轨道数据源

    Parameter CZ-4 DEB IRIDIUM 172
    Semimajor Axis (a) 7168.961 km 7155.804 km
    Eccentricity (e) 0.005521 0.000224
    Inclination (i) 98.4280° 86.3978°
    RAAN 257.4051° 315.8564°
    Perigee Argument 174.3560° 95.2612°
    Mean Anomaly (M) 214.1180° 264.8840°
    Apogee 830.407 km 779.271 km
    Perigee 751.241 km 776.063 km
    Orbit Epoch 2026-09-14T23:21:08+0000 2026-09-15T11:03:35+0000

    CZ-4 DEB & IRIDIUM 172 Collision Probability (Pc) Trend

    CZ-4 DEB & IRIDIUM 172 Collision Probability (Pc) TrendNot Available

    CZ-4 DEB & IRIDIUM 172 Miss Distance (Miss Distance) Trend

    CZ-4 DEB & IRIDIUM 172 Miss Distance (Miss Distance) TrendNot Available

    CZ-4 DEBMiss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    IRIDIUM 172Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    CZ-4 DEBCollision Probability Trend

    Object 1 Probability TrendNot Available

    IRIDIUM 172Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with CZ-4 DEB

    No nearby objects data