Conjunction Event Detail

    Low Risk
    Low collision probability. Continue monitoring.
    1.631417E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-11T21:03:46+0800
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    1 Object 1

    Name USA 77
    AOE ID 21809
    NORAD ID 21809
    Object Type PAYLOAD
    Country
    US US
    VS

    2 Object 2

    AOE ID 68275
    NORAD ID 68275
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter USA 77 STARLINK-37123
    Time of Closest Approach 2026-09-13T09:10:13+0000
    Collision Probability (Pc) 1.631417E-6
    Conjunction Distance (km) 2.394 km
    Relative Speed (km/s) 11.428 km/s
    Conjunction Risk Parameters R (Radial): -2.213 | I (In-track): -0.661 | C (Cross-track): 0.625
    Collision Risk Index (CRI) 0.39
    X Position (km) 3135.256 3133.586
    Position Y (km) -4303.682 -4302.905
    Position Z (km) 4288.764 4287.236
    Velocity X (km/s) 1.142 6.558
    Velocity Y (km/s) 6.197 0.987
    Velocity Z (km/s) 4.817 -3.792

    Orbital Parameters 国际轨道数据源

    Parameter USA 77 STARLINK-37123
    Semimajor Axis (a) 7424.542 km 6840.835 km
    Eccentricity (e) 0.089908 0.000128
    Inclination (i) 63.2947° 53.1580°
    RAAN 288.2815° 173.3722°
    Perigee Argument 76.3271° 104.8619°
    Mean Anomaly (M) 293.6137° 255.2525°
    Apogee 1713.928 km 463.573 km
    Perigee 378.882 km 461.823 km
    Orbit Epoch 2026-09-11T02:09:02+0000 2026-09-11T05:01:38+0000

    USA 77 & STARLINK-37123 Collision Probability (Pc) Trend

    USA 77 & STARLINK-37123 Collision Probability (Pc) TrendNot Available

    USA 77 & STARLINK-37123 Miss Distance (Miss Distance) Trend

    USA 77 & STARLINK-37123 Miss Distance (Miss Distance) TrendNot Available

    USA 77Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    STARLINK-37123Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    USA 77Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-37123Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with USA 77

    No nearby objects data