Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    1.399132E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-26T17:56:04+0800
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    1 Object 1

    Name USA 55
    AOE ID 20547
    NORAD ID 20547
    Object Type PAYLOAD
    Country
    US US
    ← VS →

    2 Object 2

    AOE ID 58327
    NORAD ID 58327
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter USA 55 FLOCK 4Q 4
    Time of Closest Approach 2026-10-27T20:14:09+0000
    Collision Probability (Pc) 1.399132E-6
    Conjunction Distance (km) 2.936 km
    Relative Speed (km/s) 15.253 km/s
    Conjunction Risk Parameters R (Radial): 0.406 | I (In-track): -0.346 | C (Cross-track): 2.887
    Collision Risk Index (CRI) 0.38
    X Position (km) -4802.227 -4803.619
    Position Y (km) -3502.398 -3499.817
    Position Z (km) 3263.396 3263.271
    Velocity X (km/s) 2.596 -3.622
    Velocity Y (km/s) 2.669 -1.25
    Velocity Z (km/s) 6.721 -6.643

    Orbital Parameters 国际轨道数据源

    Parameter USA 55 FLOCK 4Q 4
    Semimajor Axis (a) 6808.336 km 6781.697 km
    Eccentricity (e) 0.005314 0.000451
    Inclination (i) 94.1020° 97.3771°
    RAAN 217.2231° 29.0507°
    Perigee Argument 353.4291° 66.8444°
    Mean Anomaly (M) 6.6261° 293.3285°
    Apogee 466.382 km 406.619 km
    Perigee 394.016 km 400.501 km
    Orbit Epoch 2026-10-25T19:56:13+0000 2026-10-24T23:37:01+0000

    USA 55 & FLOCK 4Q 4 Collision Probability (Pc) Trend

    USA 55 & FLOCK 4Q 4 Collision Probability (Pc) TrendNot Available

    USA 55 & FLOCK 4Q 4 Miss Distance (Miss Distance) Trend

    USA 55 & FLOCK 4Q 4 Miss Distance (Miss Distance) TrendNot Available

    USA 55Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    FLOCK 4Q 4Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    USA 55Collision Probability Trend

    Object 1 Probability TrendNot Available

    FLOCK 4Q 4Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with USA 55

    No nearby objects data