Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    1.780083E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-20T19:29:58+0800
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    1 Object 1

    AOE ID 34018
    NORAD ID 34018
    Object Type DEBRIS
    Country
    CIS CIS
    ← VS →

    2 Object 2

    AOE ID 37931
    NORAD ID 37931
    Object Type PAYLOAD
    Country
    CN CN

    Conjunction Constraints

    Parameter COSMOS 2251 DEB SHIYAN 4 (SY-4)
    Time of Closest Approach 2026-10-20T13:22:35+0000
    Collision Probability (Pc) 1.780083E-6
    Conjunction Distance (km) 1.84 km
    Relative Speed (km/s) 4.891 km/s
    Conjunction Risk Parameters R (Radial): -0.004 | I (In-track): -1.727 | C (Cross-track): 0.631
    Collision Risk Index (CRI) 0.4
    X Position (km) -2557.545 -2558.157
    Position Y (km) 3989.27 3990.509
    Position Z (km) -5385.884 -5384.67
    Velocity X (km/s) 0.138 4.364
    Velocity Y (km/s) -6.085 -3.651
    Velocity Z (km/s) -4.441 -4.805

    Orbital Parameters 国际轨道数据源

    Parameter COSMOS 2251 DEB SHIYAN 4 (SY-4)
    Semimajor Axis (a) 7337.102 km 7165.978 km
    Eccentricity (e) 0.026688 0.002365
    Inclination (i) 73.8755° 98.6911°
    RAAN 284.8383° 311.9589°
    Perigee Argument 263.5039° 137.9703°
    Mean Anomaly (M) 274.7073° 35.1502°
    Apogee 1154.777 km 804.789 km
    Perigee 763.153 km 770.893 km
    Orbit Epoch 2026-10-19T17:59:40+0000 2026-10-19T20:20:12+0000

    COSMOS 2251 DEB & SHIYAN 4 (SY-4) Collision Probability (Pc) Trend

    COSMOS 2251 DEB & SHIYAN 4 (SY-4) Collision Probability (Pc) TrendNot Available

    COSMOS 2251 DEB & SHIYAN 4 (SY-4) Miss Distance (Miss Distance) Trend

    COSMOS 2251 DEB & SHIYAN 4 (SY-4) Miss Distance (Miss Distance) TrendNot Available

    COSMOS 2251 DEBMiss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    SHIYAN 4 (SY-4)Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    COSMOS 2251 DEBCollision Probability Trend

    Object 1 Probability TrendNot Available

    SHIYAN 4 (SY-4)Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with COSMOS 2251 DEB

    No nearby objects data