Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    1.214798E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-30T18:58:45+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 69733
    NORAD ID 69733
    Object Type DEBRIS
    Country
    CN CN

    Conjunction Constraints

    Parameter USA 121 YAOGAN 25C DEB
    Time of Closest Approach 2026-10-31T17:45:26+0000
    Collision Probability (Pc) 1.214798E-6
    Conjunction Distance (km) 2.911 km
    Relative Speed (km/s) 11.695 km/s
    Conjunction Risk Parameters R (Radial): 0.708 | I (In-track): 1.744 | C (Cross-track): 2.221
    Collision Risk Index (CRI) 0.37
    X Position (km) 5026.416 5027.625
    Position Y (km) -1366.859 -1364.263
    Position Z (km) 5061.43 5061.945
    Velocity X (km/s) 5.58 -2.602
    Velocity Y (km/s) 3.337 5.559
    Velocity Z (km/s) -3.75 4.304

    Orbital Parameters 国际轨道数据源

    Parameter USA 121 YAOGAN 25C DEB
    Semimajor Axis (a) 7462.832 km 7445.983 km
    Eccentricity (e) 0.085816 0.032044
    Inclination (i) 63.3165° 63.3794°
    RAAN 199.3506° 321.4545°
    Perigee Argument 51.6019° 8.0169°
    Mean Anomaly (M) 315.8960° 352.5809°
    Apogee 1725.126 km 1306.444 km
    Perigee 444.264 km 829.248 km
    Orbit Epoch 2026-10-29T17:05:03+0000 2026-10-29T12:14:03+0000

    USA 121 & YAOGAN 25C DEB Collision Probability (Pc) Trend

    USA 121 & YAOGAN 25C DEB Collision Probability (Pc) TrendNot Available

    USA 121 & YAOGAN 25C DEB Miss Distance (Miss Distance) Trend

    USA 121 & YAOGAN 25C DEB Miss Distance (Miss Distance) TrendNot Available

    USA 121Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    YAOGAN 25C DEBMiss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    USA 121Collision Probability Trend

    Object 1 Probability TrendNot Available

    YAOGAN 25C DEBCollision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with USA 121

    No nearby objects data