Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    2.136115E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-24T22:45:07+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 59011
    NORAD ID 59011
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-31491
    Time of Closest Approach 2026-10-25T03:57:03+0000
    Collision Probability (Pc) 2.136115E-6
    Conjunction Distance (km) 1.981 km
    Relative Speed (km/s) 8.941 km/s
    Conjunction Risk Parameters R (Radial): -1.515 | I (In-track): 1.038 | C (Cross-track): 0.74
    Collision Risk Index (CRI) 0.42
    X Position (km) 2361.562 2360.985
    Position Y (km) -5591.932 -5593.768
    Position Z (km) -3160.004 -3160.469
    Velocity X (km/s) 6.984 3.743
    Velocity Y (km/s) 1.38 4.394
    Velocity Z (km/s) 2.777 -4.99

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-31491
    Semimajor Axis (a) 6859.248 km 6840.871 km
    Eccentricity (e) 0.002574 0.000122
    Inclination (i) 35.9932° 53.1603°
    RAAN 343.9776° 95.8824°
    Perigee Argument 295.7605° 92.8586°
    Mean Anomaly (M) 64.0473° 267.2556°
    Apogee 498.769 km 463.568 km
    Perigee 463.453 km 461.900 km
    Orbit Epoch 2026-10-24T07:47:33+0000 2026-10-23T21:18:55+0000

    SHIYAN 21 (SY-21) & STARLINK-31491 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-31491 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-31491 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-31491 Miss Distance (Miss Distance) TrendNot Available

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

    Object 1 Miss Distance TrendNot Available

    STARLINK-31491Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-31491Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data