Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    2.356485E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-30T18:57:05+0800
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    1 Object 1

    Name USA 57
    AOE ID 20561
    NORAD ID 20561
    Object Type PAYLOAD
    Country
    US US
    ← VS →

    2 Object 2

    AOE ID 28894
    NORAD ID 28894
    Object Type PAYLOAD
    Country
    ESA ESA

    Conjunction Constraints

    Parameter USA 57 SSETI-EXPRESS
    Time of Closest Approach 2026-11-01T15:14:09+0000
    Collision Probability (Pc) 2.356485E-6
    Conjunction Distance (km) 2.172 km
    Relative Speed (km/s) 14.951 km/s
    Conjunction Risk Parameters R (Radial): 0.346 | I (In-track): 0.179 | C (Cross-track): 2.137
    Collision Risk Index (CRI) 0.42
    X Position (km) 826.963 824.794
    Position Y (km) 5990.842 5990.746
    Position Z (km) 3648.361 3648.341
    Velocity X (km/s) 0.504 0.735
    Velocity Y (km/s) 3.822 -3.97
    Velocity Z (km/s) -6.427 6.331

    Orbital Parameters 国际轨道数据源

    Parameter USA 57 SSETI-EXPRESS
    Semimajor Axis (a) 7028.503 km 7053.648 km
    Eccentricity (e) 0.006412 0.001517
    Inclination (i) 89.8499° 98.3278°
    RAAN 262.3049° 84.3890°
    Perigee Argument 306.0314° 213.4618°
    Mean Anomaly (M) 53.4974° 146.5628°
    Apogee 695.432 km 686.210 km
    Perigee 605.300 km 664.812 km
    Orbit Epoch 2026-10-28T16:01:01+0000 2026-10-29T19:54:27+0000

    USA 57 & SSETI-EXPRESS Collision Probability (Pc) Trend

    USA 57 & SSETI-EXPRESS Collision Probability (Pc) TrendNot Available

    USA 57 & SSETI-EXPRESS Miss Distance (Miss Distance) Trend

    USA 57 & SSETI-EXPRESS Miss Distance (Miss Distance) TrendNot Available

    USA 57Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    SSETI-EXPRESSMiss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    USA 57Collision Probability Trend

    Object 1 Probability TrendNot Available

    SSETI-EXPRESSCollision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with USA 57

    No nearby objects data