Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    1.67108E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-01T10:47:10+0800
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    1 Object 1

    Name NOAA 9
    AOE ID 15427
    NORAD ID 15427
    Object Type PAYLOAD
    Country
    US US
    ← VS →

    2 Object 2

    AOE ID 40251
    NORAD ID 40251
    Object Type DEBRIS
    Country
    US US

    Conjunction Constraints

    Parameter NOAA 9 IRIDIUM 47 DEB
    Time of Closest Approach 2026-10-01T20:46:17+0000
    Collision Probability (Pc) 1.67108E-6
    Conjunction Distance (km) 1.78 km
    Relative Speed (km/s) 3.802 km/s
    Conjunction Risk Parameters R (Radial): -1.137 | I (In-track): 1.314 | C (Cross-track): -0.381
    Collision Risk Index (CRI) 0.39
    X Position (km) 2521.998 2522.511
    Position Y (km) -1881.158 -1881.693
    Position Z (km) -6504.365 -6502.747
    Velocity X (km/s) 3.373 5.943
    Velocity Y (km/s) -5.875 -3.077
    Velocity Z (km/s) 3.019 3.128

    Orbital Parameters 国际轨道数据源

    Parameter NOAA 9 IRIDIUM 47 DEB
    Semimajor Axis (a) 7213.347 km 7154.507 km
    Eccentricity (e) 0.001540 0.012058
    Inclination (i) 99.0928° 86.3252°
    RAAN 302.6211° 331.6482°
    Perigee Argument 53.9943° 164.4206°
    Mean Anomaly (M) 106.7225° 196.0755°
    Apogee 846.323 km 862.641 km
    Perigee 824.097 km 690.099 km
    Orbit Epoch 2026-09-30T13:38:24+0000 2026-09-30T03:13:41+0000

    NOAA 9 & IRIDIUM 47 DEB Collision Probability (Pc) Trend

    NOAA 9 & IRIDIUM 47 DEB Collision Probability (Pc) TrendNot Available

    NOAA 9 & IRIDIUM 47 DEB Miss Distance (Miss Distance) Trend

    NOAA 9 & IRIDIUM 47 DEB Miss Distance (Miss Distance) TrendNot Available

    NOAA 9Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    IRIDIUM 47 DEBMiss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    NOAA 9Collision Probability Trend

    Object 1 Probability TrendNot Available

    IRIDIUM 47 DEBCollision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with NOAA 9

    No nearby objects data