Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    4.82391E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-19T03:27:13+0800
    View CDM
    Download CDM 1.0

    1 Object 1

    AOE ID 54752
    NORAD ID 54752
    Object Type PAYLOAD
    Country
    CN CN
    ← VS →

    2 Object 2

    AOE ID 55456
    NORAD ID 55456
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-5058
    Time of Closest Approach 2026-10-18T23:51:28+0000
    Collision Probability (Pc) 4.82391E-6
    Conjunction Distance (km) 1.49 km
    Relative Speed (km/s) 8.812 km/s
    Conjunction Risk Parameters R (Radial): 1.433 | I (In-track): 0.336 | C (Cross-track): -0.231
    Collision Risk Index (CRI) 0.49
    X Position (km) -6372.918 -6371.521
    Position Y (km) 1221.852 1221.998
    Position Z (km) 2225.906 2225.409
    Velocity X (km/s) -2.474 0.436
    Velocity Y (km/s) -6.166 -6.087
    Velocity Z (km/s) -3.741 4.575

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-5058
    Semimajor Axis (a) 6859.501 km 6861.253 km
    Eccentricity (e) 0.002577 0.000123
    Inclination (i) 35.9927° 43.0018°
    RAAN 20.3794° 153.1161°
    Perigee Argument 246.8124° 257.2761°
    Mean Anomaly (M) 112.9895° 102.7954°
    Apogee 499.041 km 483.958 km
    Perigee 463.687 km 482.274 km
    Orbit Epoch 2026-10-18T12:14:31+0000 2026-10-18T00:11:41+0000

    SHIYAN 21 (SY-21) & STARLINK-5058 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-5058 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-5058 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-5058 Miss Distance (Miss Distance) TrendNot Available

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

    Object 1 Miss Distance TrendNot Available

    STARLINK-5058Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-5058Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data