Conjunction Event Detail

    Low Risk
    Low collision probability. Continue monitoring.
    1.823172E-6
    Collision Probability (Pc)
    Last Conjunction Event Update Time 2026-09-10T04:05:36+0800
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    1 Object 1

    AOE ID 2657
    NORAD ID 2657
    Object Type PAYLOAD
    Country
    US US
    VS

    2 Object 2

    AOE ID 19790
    NORAD ID 19790
    Object Type PAYLOAD
    Country
    CIS CIS

    Conjunction Constraints

    Parameter ESSA 4 (TOS-B) COSMOS 1999
    Time of Closest Approach 2026-09-09T21:52:26+0000
    Collision Probability (Pc) 1.823172E-6
    Conjunction Distance (km) 2.423 km
    Relative Speed (km/s) 14.3 km/s
    Conjunction Risk Parameters R (Radial): -2.418 | I (In-track): -0.005 | C (Cross-track): 0.131
    Collision Risk Index (CRI) 0.4
    X Position (km) -213.019 -212.955
    Position Y (km) -6670.168 -6672.24
    Position Z (km) -3987.019 -3988.271
    Velocity X (km/s) -1.631 0.956
    Velocity Y (km/s) 3.565 -3.649
    Velocity Z (km/s) -5.985 6.086

    Orbital Parameters 国际轨道数据源

    Parameter ESSA 4 (TOS-B) COSMOS 1999
    Semimajor Axis (a) 7760.516 km 7777.429 km
    Eccentricity (e) 0.007319 0.002017
    Inclination (i) 102.0783° 82.6135°
    RAAN 94.5986° 272.8987°
    Perigee Argument 115.0924° 33.6309°
    Mean Anomaly (M) 39.4557° 83.2852°
    Apogee 1439.177 km 1414.976 km
    Perigee 1325.581 km 1383.608 km
    Orbit Epoch 2026-09-09T00:46:51+0000 2026-09-09T11:16:13+0000

    ESSA 4 (TOS-B) & COSMOS 1999 Collision Probability (Pc) Trend

    ESSA 4 (TOS-B) & COSMOS 1999 Collision Probability (Pc) TrendNot Available

    ESSA 4 (TOS-B) & COSMOS 1999 Miss Distance (Miss Distance) Trend

    ESSA 4 (TOS-B) & COSMOS 1999 Miss Distance (Miss Distance) TrendNot Available

    ESSA 4 (TOS-B)Miss Distance Trend with All Objects

    Object 1 Miss Distance TrendNot Available

    COSMOS 1999Miss Distance Trend with All Objects

    Object 2 Miss Distance TrendNot Available

    ESSA 4 (TOS-B)Collision Probability Trend

    Object 1 Probability TrendNot Available

    COSMOS 1999Collision Probability Trend

    Object 2 Probability TrendNot Available

    Nearby Objects with ESSA 4 (TOS-B)

    No nearby objects data