Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    9.717492E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-15T11:31:13+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 59516
    NORAD ID 59516
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-31671
    Time of Closest Approach 2026-10-15T10:21:46+0000
    Collision Probability (Pc) 9.717492E-6
    Conjunction Distance (km) 1.196 km
    Relative Speed (km/s) 8.31 km/s
    Conjunction Risk Parameters R (Radial): 0.281 | I (In-track): -0.97 | C (Cross-track): 0.639
    Collision Risk Index (CRI) 0.55
    X Position (km) 6308.124 6308.502
    Position Y (km) 457.869 456.736
    Position Z (km) -2665.476 -2665.496
    Velocity X (km/s) 0.944 -2.231
    Velocity Y (km/s) 6.777 5.902
    Velocity Z (km/s) 3.355 -4.275

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-31671
    Semimajor Axis (a) 6859.710 km 6861.198 km
    Eccentricity (e) 0.002534 0.000131
    Inclination (i) 35.9915° 43.0019°
    RAAN 46.9620° 164.8643°
    Perigee Argument 210.4430° 317.7756°
    Mean Anomaly (M) 149.4833° 42.2995°
    Apogee 498.953 km 483.963 km
    Perigee 464.193 km 482.159 km
    Orbit Epoch 2026-10-14T06:19:05+0000 2026-10-14T02:02:31+0000

    SHIYAN 21 (SY-21) & STARLINK-31671 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-31671 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-31671 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-31671 Miss Distance (Miss Distance) TrendNot Available

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

    Object 1 Miss Distance TrendNot Available

    STARLINK-31671Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-31671Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data