Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    3.904818E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-12T21:05:57+0800
    View CDM
    Download CDM 1.0

    1 Object 1

    AOE ID 49730
    NORAD ID 49730
    Object Type PAYLOAD
    Country
    US US
    ← VS →

    2 Object 2

    AOE ID 54752
    NORAD ID 54752
    Object Type PAYLOAD
    Country
    CN CN

    Conjunction Constraints

    Parameter STARLINK-3249 SHIYAN 21 (SY-21)
    Time of Closest Approach 2026-10-13T07:36:59+0000
    Collision Probability (Pc) 3.904818E-6
    Conjunction Distance (km) 1.661 km
    Relative Speed (km/s) 10.687 km/s
    Conjunction Risk Parameters R (Radial): 0.004 | I (In-track): 1.18 | C (Cross-track): 1.17
    Collision Risk Index (CRI) 0.47
    X Position (km) -3452.843 -3454.245
    Position Y (km) -5879.613 -5878.76
    Position Z (km) -575.337 -575.597
    Velocity X (km/s) 3.704 5.541
    Velocity Y (km/s) -2.762 -2.82
    Velocity Z (km/s) 6.078 -4.448

    Orbital Parameters 国际轨道数据源

    Parameter STARLINK-3249 SHIYAN 21 (SY-21)
    Semimajor Axis (a) 6840.925 km 6859.818 km
    Eccentricity (e) 0.000121 0.002499
    Inclination (i) 53.1592° 35.9910°
    RAAN 248.0713° 62.0943°
    Perigee Argument 101.3758° 189.5229°
    Mean Anomaly (M) 258.7382° 170.5033°
    Apogee 463.620 km 498.823 km
    Perigee 461.956 km 464.539 km
    Orbit Epoch 2026-10-12T06:37:49+0000 2026-10-11T20:17:54+0000

    STARLINK-3249 & SHIYAN 21 (SY-21) Collision Probability (Pc) Trend

    STARLINK-3249 & SHIYAN 21 (SY-21) Collision Probability (Pc) TrendNot Available

    STARLINK-3249 & SHIYAN 21 (SY-21) Miss Distance (Miss Distance) Trend

    STARLINK-3249 & SHIYAN 21 (SY-21) Miss Distance (Miss Distance) TrendNot Available

    STARLINK-3249Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

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

    Object 2 Miss Distance TrendNot Available

    STARLINK-3249Collision Probability Trend

    Object 1 Probability TrendNot Available

    SHIYAN 21 (SY-21)Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with STARLINK-3249

    No nearby objects data