Conjunction Event Detail

    ⚠
    High Risk
    High collision probability. Maneuver recommended for primary asset.
    1.009807E-4
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-20T00:22:44+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 59503
    NORAD ID 59503
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter USA 77 STARLINK-31508
    Time of Closest Approach 2026-10-19T22:16:34+0000
    Collision Probability (Pc) 1.009807E-4
    Conjunction Distance (km) 0.494 km
    Relative Speed (km/s) 4.241 km/s
    Conjunction Risk Parameters R (Radial): -0.332 | I (In-track): -0.352 | C (Cross-track): 0.093
    Collision Risk Index (CRI) 0.75
    X Position (km) -4941.265 -4941.275
    Position Y (km) -2442.497 -2442.197
    Position Z (km) 4077.702 4077.311
    Velocity X (km/s) 5.731 4.765
    Velocity Y (km/s) -2.094 -5.386
    Velocity Z (km/s) 5.035 2.542

    Orbital Parameters 国际轨道数据源

    Parameter USA 77 STARLINK-31508
    Semimajor Axis (a) 7423.694 km 6861.205 km
    Eccentricity (e) 0.089878 0.000113
    Inclination (i) 63.2937° 43.0013°
    RAAN 186.6269° 158.9938°
    Perigee Argument 77.0477° 272.0561°
    Mean Anomaly (M) 292.9275° 88.0161°
    Apogee 1712.787 km 483.845 km
    Perigee 378.327 km 482.291 km
    Orbit Epoch 2026-10-19T02:38:30+0000 2026-10-19T00:02:30+0000

    USA 77 & STARLINK-31508 Collision Probability (Pc) Trend

    USA 77 & STARLINK-31508 Collision Probability (Pc) TrendNot Available

    USA 77 & STARLINK-31508 Miss Distance (Miss Distance) Trend

    USA 77 & STARLINK-31508 Miss Distance (Miss Distance) TrendNot Available

    USA 77Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    STARLINK-31508Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    USA 77Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-31508Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with USA 77

    No nearby objects data