Conjunction Event Detail

    Very Low Risk
    Very low collision probability. Continue monitoring.
    9.024374E-7
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-04T16:56:20+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 59511
    NORAD ID 59511
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-31635
    Time of Closest Approach 2026-09-04T12:30:17+0000
    Collision Probability (Pc) 9.024374E-7
    Conjunction Distance (km) 2.934 km
    Relative Speed (km/s) 7.011 km/s
    Conjunction Risk Parameters R (Radial): -2.69 | I (In-track): 1.039 | C (Cross-track): 0.538
    Collision Risk Index (CRI) 0.34
    X Position (km) -2542.312 -2544.386
    Position Y (km) -5412.137 -5413.815
    Position Z (km) -3363.414 -3364.634
    Velocity X (km/s) 5.809 6.651
    Velocity Y (km/s) -4.281 -0.882
    Velocity Z (km/s) 2.46 -3.614

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-31635
    Semimajor Axis (a) 6861.169 km 6861.194 km
    Eccentricity (e) 0.002623 0.000128
    Inclination (i) 35.9906° 43.0019°
    RAAN 297.6242° 31.9978°
    Perigee Argument 218.5753° 265.7709°
    Mean Anomaly (M) 141.3106° 94.2997°
    Apogee 501.030 km 483.934 km
    Perigee 465.034 km 482.180 km
    Orbit Epoch 2026-09-04T04:54:33+0000 2026-09-03T18:15:30+0000

    SHIYAN 21 (SY-21) & STARLINK-31635 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-31635 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-31635 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-31635 Miss Distance (Miss Distance) TrendNot Available

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

    Object 1 Miss Distance TrendNot Available

    STARLINK-31635Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-31635Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data