Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    1.322565E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-20T13:57:09+0800
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    1 Object 1

    AOE ID 54175
    NORAD ID 54175
    Object Type PAYLOAD
    Country
    US US
    ← VS →

    2 Object 2

    AOE ID 54752
    NORAD ID 54752
    Object Type PAYLOAD
    Country
    CN CN

    Conjunction Constraints

    Parameter STARLINK-5256 SHIYAN 21 (SY-21)
    Time of Closest Approach 2026-10-21T04:06:02+0000
    Collision Probability (Pc) 1.322565E-6
    Conjunction Distance (km) 2.063 km
    Relative Speed (km/s) 4.745 km/s
    Conjunction Risk Parameters R (Radial): -1.467 | I (In-track): -1.377 | C (Cross-track): -0.447
    Collision Risk Index (CRI) 0.37
    X Position (km) -694.048 -695.25
    Position Y (km) -5530.762 -5529.759
    Position Z (km) -3973.853 -3972.511
    Velocity X (km/s) 5.946 7.595
    Velocity Y (km/s) 2.271 -0.456
    Velocity Z (km/s) -4.204 -0.689

    Orbital Parameters 国际轨道数据源

    Parameter STARLINK-5256 SHIYAN 21 (SY-21)
    Semimajor Axis (a) 6840.880 km 6859.452 km
    Eccentricity (e) 0.000121 0.002582
    Inclination (i) 53.1596° 35.9929°
    RAAN 58.9535° 13.4265°
    Perigee Argument 85.4507° 256.2724°
    Mean Anomaly (M) 274.6634° 103.5135°
    Apogee 463.574 km 499.027 km
    Perigee 461.912 km 463.603 km
    Orbit Epoch 2026-10-19T08:54:35+0000 2026-10-19T14:53:53+0000

    STARLINK-5256 & SHIYAN 21 (SY-21) Collision Probability (Pc) Trend

    STARLINK-5256 & SHIYAN 21 (SY-21) Collision Probability (Pc) TrendNot Available

    STARLINK-5256 & SHIYAN 21 (SY-21) Miss Distance (Miss Distance) Trend

    STARLINK-5256 & SHIYAN 21 (SY-21) Miss Distance (Miss Distance) TrendNot Available

    STARLINK-5256Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    STARLINK-5256Collision Probability Trend

    Object 1 Probability TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with STARLINK-5256

    No nearby objects data