Conjunction Event Detail

    Very Low Risk
    Very low collision probability. Continue monitoring.
    5.443229E-7
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-11T21:32:23+0800
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    1 Object 1

    Name USA 121
    AOE ID 23908
    NORAD ID 23908
    Object Type PAYLOAD
    Country
    US US
    VS

    2 Object 2

    AOE ID 66017
    NORAD ID 66017
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter USA 121 STARLINK-35398
    Time of Closest Approach 2026-09-12T17:02:01+0000
    Collision Probability (Pc) 5.443229E-7
    Conjunction Distance (km) 2.572 km
    Relative Speed (km/s) 1.863 km/s
    Conjunction Risk Parameters R (Radial): 2.526 | I (In-track): 0.479 | C (Cross-track): 0.047
    Collision Risk Index (CRI) 0.3
    X Position (km) 5402.703 5404.541
    Position Y (km) -1737.525 -1737.885
    Position Z (km) 3806.394 3808.157
    Velocity X (km/s) -2.343 -1.121
    Velocity Y (km/s) 5.269 6.154
    Velocity Z (km/s) 5.477 4.385

    Orbital Parameters 国际轨道数据源

    Parameter USA 121 STARLINK-35398
    Semimajor Axis (a) 7463.345 km 6840.814 km
    Eccentricity (e) 0.085574 0.000133
    Inclination (i) 63.3190° 53.1602°
    RAAN 326.3691° 319.0250°
    Perigee Argument 50.8548° 104.2186°
    Mean Anomaly (M) 316.5415° 255.8965°
    Apogee 1723.880 km 463.590 km
    Perigee 446.536 km 461.764 km
    Orbit Epoch 2026-09-11T05:13:17+0000 2026-09-11T04:53:18+0000

    USA 121 & STARLINK-35398 Collision Probability (Pc) Trend

    USA 121 & STARLINK-35398 Collision Probability (Pc) TrendNot Available

    USA 121 & STARLINK-35398 Miss Distance (Miss Distance) Trend

    USA 121 & STARLINK-35398 Miss Distance (Miss Distance) TrendNot Available

    USA 121Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    STARLINK-35398Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    USA 121Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-35398Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with USA 121

    No nearby objects data