Conjunction Event Detail

    Low Risk
    Low collision probability. Continue monitoring.
    1.14941E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-04T18:19:21+0800
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    1 Object 1

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

    2 Object 2

    AOE ID 66865
    NORAD ID 66865
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-36117
    Time of Closest Approach 2026-09-05T19:09:45+0000
    Collision Probability (Pc) 1.14941E-6
    Conjunction Distance (km) 2.637 km
    Relative Speed (km/s) 8.348 km/s
    Conjunction Risk Parameters R (Radial): -0.021 | I (In-track): -2.203 | C (Cross-track): 1.449
    Collision Risk Index (CRI) 0.36
    X Position (km) 1896.832 1894.307
    Position Y (km) 6038.046 6038.779
    Position Z (km) 2640.901 2641.09
    Velocity X (km/s) -5.96 -6.305
    Velocity Y (km/s) 3.339 0.094
    Velocity Z (km/s) -3.392 4.292

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-36117
    Semimajor Axis (a) 6861.169 km 6861.165 km
    Eccentricity (e) 0.002623 0.000128
    Inclination (i) 35.9906° 42.9999°
    RAAN 297.6242° 58.9459°
    Perigee Argument 218.5753° 252.7673°
    Mean Anomaly (M) 141.3106° 107.3039°
    Apogee 501.030 km 483.905 km
    Perigee 465.034 km 482.151 km
    Orbit Epoch 2026-09-04T04:54:33+0000 2026-09-03T12:05:24+0000

    SHIYAN 21 (SY-21) & STARLINK-36117 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-36117 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-36117 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-36117 Miss Distance (Miss Distance) TrendNot Available

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

    Object 1 Miss Distance TrendNot Available

    STARLINK-36117Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-36117Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data