Conjunction Event Detail

    Medium Risk
    Monitor closely. Maneuver recommended for primary asset.
    1.034747E-5
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-05T16:14:32+0800
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    1 Object 1

    AOE ID 53588
    NORAD ID 53588
    Object Type PAYLOAD
    Country
    US US
    VS

    2 Object 2

    AOE ID 63833
    NORAD ID 63833
    Object Type PAYLOAD
    Country
    IT IT

    Conjunction Constraints

    Parameter STARLINK-4691 HERMES 4
    Time of Closest Approach 2026-09-07T19:09:18+0000
    Collision Probability (Pc) 1.034747E-5
    Conjunction Distance (km) 1.09 km
    Relative Speed (km/s) 5.74 km/s
    Conjunction Risk Parameters R (Radial): -0.791 | I (In-track): -0.695 | C (Cross-track): 0.28
    Collision Risk Index (CRI) 0.55
    X Position (km) 5556.1 5555.351
    Position Y (km) -4010.245 -4009.942
    Position Z (km) -58.794 -58.063
    Velocity X (km/s) 2.64 -0.619
    Velocity Y (km/s) 3.734 -0.76
    Velocity Z (km/s) -6.108 -7.566

    Orbital Parameters 国际轨道数据源

    Parameter STARLINK-4691 HERMES 4
    Semimajor Axis (a) 6851.825 km 6848.257 km
    Eccentricity (e) 0.000173 0.000090
    Inclination (i) 53.1603° 97.3754°
    RAAN 157.2098° 140.8915°
    Perigee Argument 87.5596° 314.0717°
    Mean Anomaly (M) 45.2946° 46.0451°
    Apogee 474.875 km 470.737 km
    Perigee 472.501 km 469.503 km
    Orbit Epoch 2026-09-04T22:00:02+0000 2026-09-04T10:25:09+0000

    STARLINK-4691 & HERMES 4 Collision Probability (Pc) Trend

    STARLINK-4691 & HERMES 4 Collision Probability (Pc) TrendNot Available

    STARLINK-4691 & HERMES 4 Miss Distance (Miss Distance) Trend

    STARLINK-4691 & HERMES 4 Miss Distance (Miss Distance) TrendNot Available

    STARLINK-4691Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    HERMES 4Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    STARLINK-4691Collision Probability Trend

    Object 1 Probability TrendNot Available

    HERMES 4Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with STARLINK-4691

    No nearby objects data