Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    2.399111E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-19T06:34:24+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 66486
    NORAD ID 66486
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter SHIYAN 21 (SY-21) STARLINK-34844
    Time of Closest Approach 2026-10-20T16:41:27+0000
    Collision Probability (Pc) 2.399111E-6
    Conjunction Distance (km) 1.918 km
    Relative Speed (km/s) 9.439 km/s
    Conjunction Risk Parameters R (Radial): 1.843 | I (In-track): -0.415 | C (Cross-track): 0.331
    Collision Risk Index (CRI) 0.43
    X Position (km) -6665.535 -6663.818
    Position Y (km) 999.097 998.303
    Position Z (km) 1284.573 1284.259
    Velocity X (km/s) -1.718 0.107
    Velocity Y (km/s) -6.091 -5.756
    Velocity Z (km/s) -4.251 5.003

    Orbital Parameters 国际轨道数据源

    Parameter SHIYAN 21 (SY-21) STARLINK-34844
    Semimajor Axis (a) 6859.494 km 6861.167 km
    Eccentricity (e) 0.002576 0.000188
    Inclination (i) 35.9927° 43.0023°
    RAAN 19.5614° 174.4723°
    Perigee Argument 247.9565° 262.0093°
    Mean Anomaly (M) 111.8432° 98.0546°
    Apogee 499.030 km 484.317 km
    Perigee 463.684 km 481.743 km
    Orbit Epoch 2026-10-18T15:22:40+0000 2026-10-18T01:51:07+0000

    SHIYAN 21 (SY-21) & STARLINK-34844 Collision Probability (Pc) Trend

    SHIYAN 21 (SY-21) & STARLINK-34844 Collision Probability (Pc) TrendNot Available

    SHIYAN 21 (SY-21) & STARLINK-34844 Miss Distance (Miss Distance) Trend

    SHIYAN 21 (SY-21) & STARLINK-34844 Miss Distance (Miss Distance) TrendNot Available

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

    Object 1 Miss Distance TrendNot Available

    STARLINK-34844Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 1 Probability TrendNot Available

    STARLINK-34844Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with SHIYAN 21 (SY-21)

    No nearby objects data