Conjunction Event Detail

    ✅
    Low Risk
    Low collision probability. Continue monitoring.
    1.45761E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-10-21T23:10:35+0800
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    1 Object 1

    Name ANNA 1B
    AOE ID 446
    NORAD ID 446
    Object Type PAYLOAD
    Country
    US US
    ← VS →

    2 Object 2

    AOE ID 1520
    NORAD ID 1520
    Object Type PAYLOAD
    Country
    US US

    Conjunction Constraints

    Parameter ANNA 1B CALSPHERE 4(A)
    Time of Closest Approach 2026-10-21T17:02:33+0000
    Collision Probability (Pc) 1.45761E-6
    Conjunction Distance (km) 2.666 km
    Relative Speed (km/s) 12.949 km/s
    Conjunction Risk Parameters R (Radial): -2.644 | I (In-track): -0.141 | C (Cross-track): -0.297
    Collision Risk Index (CRI) 0.38
    X Position (km) 2974.729 2976.086
    Position Y (km) -4934.842 -4936.516
    Position Z (km) 4724.556 4726.123
    Velocity X (km/s) 3.873 2.433
    Velocity Y (km/s) 5.359 -3.998
    Velocity Z (km/s) 3.185 -5.648

    Orbital Parameters 国际轨道数据源

    Parameter ANNA 1B CALSPHERE 4(A)
    Semimajor Axis (a) 7504.722 km 7501.244 km
    Eccentricity (e) 0.007025 0.007141
    Inclination (i) 50.1406° 89.8847°
    RAAN 259.4087° 121.1842°
    Perigee Argument 29.7338° 107.2283°
    Mean Anomaly (M) 107.7268° 66.6735°
    Apogee 1179.303 km 1176.672 km
    Perigee 1073.867 km 1069.542 km
    Orbit Epoch 2026-10-21T06:40:31+0000 2026-10-21T06:25:45+0000

    ANNA 1B & CALSPHERE 4(A) Collision Probability (Pc) Trend

    ANNA 1B & CALSPHERE 4(A) Collision Probability (Pc) TrendNot Available

    ANNA 1B & CALSPHERE 4(A) Miss Distance (Miss Distance) Trend

    ANNA 1B & CALSPHERE 4(A) Miss Distance (Miss Distance) TrendNot Available

    ANNA 1BMiss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    CALSPHERE 4(A)Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    ANNA 1BCollision Probability Trend

    Object 1 Probability TrendNot Available

    CALSPHERE 4(A)Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with ANNA 1B

    No nearby objects data