Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    1.471373E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-20T13:35:19+0800
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    1 Object 1

    AOE ID 49428
    NORAD ID 49428
    Object Type PAYLOAD
    Country
    US US
    ← VS →

    2 Object 2

    Name NAHLA
    AOE ID 66764
    NORAD ID 66764
    Object Type PAYLOAD
    Country
    BE BE

    Conjunction Constraints

    Parameter STARLINK-3121 NAHLA
    Time of Closest Approach 2026-10-20T12:48:46+0000
    Collision Probability (Pc) 1.471373E-6
    Conjunction Distance (km) 2.404 km
    Relative Speed (km/s) 9.731 km/s
    Conjunction Risk Parameters R (Radial): -2.371 | I (In-track): -0.302 | C (Cross-track): -0.245
    Collision Risk Index (CRI) 0.38
    X Position (km) 4442.605 4441.32
    Position Y (km) -321.42 -321.516
    Position Z (km) 5249.431 5247.403
    Velocity X (km/s) -1.662 -5.786
    Velocity Y (km/s) 7.195 -1.102
    Velocity Z (km/s) 1.844 4.818

    Orbital Parameters 国际轨道数据源

    Parameter STARLINK-3121 NAHLA
    Semimajor Axis (a) 6892.393 km 6885.744 km
    Eccentricity (e) 0.000173 0.000129
    Inclination (i) 53.1587° 97.4085°
    RAAN 298.9442° 3.8307°
    Perigee Argument 42.3271° 238.9277°
    Mean Anomaly (M) 317.7858° 121.1831°
    Apogee 515.452 km 508.499 km
    Perigee 513.060 km 506.715 km
    Orbit Epoch 2026-10-19T09:37:10+0000 2026-10-19T16:02:43+0000

    STARLINK-3121 & NAHLA Collision Probability (Pc) Trend

    STARLINK-3121 & NAHLA Collision Probability (Pc) TrendNot Available

    STARLINK-3121 & NAHLA Miss Distance (Miss Distance) Trend

    STARLINK-3121 & NAHLA Miss Distance (Miss Distance) TrendNot Available

    STARLINK-3121Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    NAHLAMiss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    STARLINK-3121Collision Probability Trend

    Object 1 Probability TrendNot Available

    NAHLACollision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with STARLINK-3121

    No nearby objects data