Conjunction Event Detail

    Very Low Risk
    Very low collision probability. Continue monitoring.
    6.242792E-7
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-03T05:48:54+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 59008
    NORAD ID 59008
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-31460
    Time of Closest Approach 2026-09-03T12:42:15+0000
    Collision Probability (Pc) 6.242792E-7
    Conjunction Distance (km) 2.921 km
    Relative Speed (km/s) 3.47 km/s
    Conjunction Risk Parameters R (Radial): -2.608 | I (In-track): 1.282 | C (Cross-track): -0.293
    Collision Risk Index (CRI) 0.31
    X Position (km) -5868.84 -5866.293
    Position Y (km) 261.861 260.636
    Position Z (km) -3517.985 -3517.248
    Velocity X (km/s) 0.972 2.561
    Velocity Y (km/s) -7.255 -5.451
    Velocity Z (km/s) -2.182 -4.684

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-31460
    Semimajor Axis (a) 6861.217 km 6840.867 km
    Eccentricity (e) 0.002592 0.000138
    Inclination (i) 35.9909° 53.1607°
    RAAN 308.6625° 339.4872°
    Perigee Argument 203.3916° 115.9662°
    Mean Anomaly (M) 156.5640° 244.1483°
    Apogee 500.865 km 463.677 km
    Perigee 465.295 km 461.783 km
    Orbit Epoch 2026-09-02T10:33:25+0000 2026-09-01T15:58:44+0000

    SHIYAN 21 (SY-21) & STARLINK-31460 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-31460 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-31460 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-31460 Miss Distance (Miss Distance) TrendNot Available

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

    Object 1 Miss Distance TrendNot Available

    STARLINK-31460Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-31460Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data