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                "detail": "Isolation data not available"
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{
    "vessel_a": {
        "mmsi": 273426280,
        "imo": 9151890,
        "name": "ODIN",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273333950,
        "imo": 9226566,
        "name": "VALERIY ZELENKO",
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    "avg_distance_m": 131.099999999999994315658113919198513031005859375,
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        "vessel_a": {
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            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
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    },
    "time_window": {
        "start": "2026-09-18T13:09:33+00:00",
        "end": "2026-09-18T15:02:15+00:00"
    },
    "points_count": {
        "vessel_a": 20,
        "vessel_b": 20
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    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 127m, avg 131m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 113 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ODIN and VALERIY ZELENKO) maintained close proximity (min 127m, avg 131m) for 113 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}

{
    "vessel_a": {
        "mmsi": 273333950,
        "imo": 9226566,
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        "flag": "RUSSIA"
    },
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        "imo": 9151890,
        "name": "ODIN",
        "flag": "RUSSIA"
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    "overlap_duration_s": 8512,
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    "speed_b_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_summary": {
        "vessel_a": {
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            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
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    },
    "time_window": {
        "start": "2026-09-18T12:35:40+00:00",
        "end": "2026-09-18T14:57:32+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 87,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 122m, avg 130m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 142 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VALERIY ZELENKO and ODIN) maintained close proximity (min 122m, avg 130m) for 142 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 388,
    "points_in_zone": 19,
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{
    "radius_m": 255.400000000000005684341886080801486968994140625,
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{
    "vessel_a": {
        "mmsi": 273426280,
        "imo": 9151890,
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        "flag": "RUSSIA"
    },
    "vessel_b": {
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        "name": "VALERIY ZELENKO",
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    "avg_distance_m": 132.599999999999994315658113919198513031005859375,
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    "speed_b_avg": 0.34999999999999997779553950749686919152736663818359375,
    "speed_b_std": 0.309999999999999997779553950749686919152736663818359375,
    "speed_summary": {
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            "max_sog": 0
        },
        "vessel_b": {
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    },
    "time_window": {
        "start": "2026-09-18T11:28:33+00:00",
        "end": "2026-09-18T13:00:14+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 125m, avg 133m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 92 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ODIN and VALERIY ZELENKO) maintained close proximity (min 125m, avg 133m) for 92 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.3 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}

{
    "zone_id": "russia_ust_luga_approach",
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    "dwell_minutes": 370.5,
    "points_in_zone": 26,
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{
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{
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{
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{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 388.3999999999999772626324556767940521240234375,
    "points_in_zone": 27,
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{
    "radius_m": 20.5,
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}

{
    "vessel_a": {
        "mmsi": 273426280,
        "imo": 9151890,
        "name": "ODIN",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273333950,
        "imo": 9226566,
        "name": "VALERIY ZELENKO",
        "flag": "RUSSIA"
    },
    "min_distance_m": 124.7000000000000028421709430404007434844970703125,
    "avg_distance_m": 132.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 4.5,
    "duration_minutes": 337.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 20240,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.2600000000000000088817841970012523233890533447265625,
    "speed_b_std": 0.2800000000000000266453525910037569701671600341796875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.2600000000000000088817841970012523233890533447265625,
            "max_sog": 1
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    },
    "time_window": {
        "start": "2026-09-18T07:22:54+00:00",
        "end": "2026-09-18T13:00:14+00:00"
    },
    "points_count": {
        "vessel_a": 20,
        "vessel_b": 20
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 125m, avg 132m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 337 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ODIN and VALERIY ZELENKO) maintained close proximity (min 125m, avg 132m) for 337 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.3 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 395.3999999999999772626324556767940521240234375,
    "points_in_zone": 31,
    "first_point": {
        "ts": "2026-09-18T07:52:18+00:00",
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        "lon": 30.2208499999999986584953148849308490753173828125
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    "last_point": {
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}

{
    "radius_m": 15.9000000000000003552713678800500929355621337890625,
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{
    "vessel_a": {
        "mmsi": 273426280,
        "imo": 9151890,
        "name": "ODIN",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273333950,
        "imo": 9226566,
        "name": "VALERIY ZELENKO",
        "flag": "RUSSIA"
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    "duration_minutes": 361,
    "overlap_duration_s": 21659,
    "speed_a_avg": 0,
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    "speed_summary": {
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            "max_sog": 0
        },
        "vessel_b": {
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    },
    "time_window": {
        "start": "2026-09-18T06:59:15+00:00",
        "end": "2026-09-18T13:00:14+00:00"
    },
    "points_count": {
        "vessel_a": 23,
        "vessel_b": 23
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 125m, avg 132m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 361 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ODIN and VALERIY ZELENKO) maintained close proximity (min 125m, avg 132m) for 361 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}

{
    "zone_id": "russia_ust_luga_approach",
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{
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{
    "zone_id": "russia_ust_luga_approach",
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{
    "vessel_a": {
        "mmsi": 273426280,
        "imo": 9151890,
        "name": "ODIN",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273333950,
        "imo": 9226566,
        "name": "VALERIY ZELENKO",
        "flag": "RUSSIA"
    },
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    "avg_distance_m": 131,
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    "overlap_duration_s": 22740,
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    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
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    "speed_summary": {
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            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
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    },
    "time_window": {
        "start": "2026-09-18T05:57:54+00:00",
        "end": "2026-09-18T12:16:54+00:00"
    },
    "points_count": {
        "vessel_a": 30,
        "vessel_b": 30
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 125m, avg 131m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 379 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ODIN and VALERIY ZELENKO) maintained close proximity (min 125m, avg 131m) for 379 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}

{
    "vessel_a": {
        "mmsi": 273333950,
        "imo": 9226566,
        "name": "VALERIY ZELENKO",
        "flag": "RUSSIA"
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        "mmsi": 273426280,
        "imo": 9151890,
        "name": "ODIN",
        "flag": "RUSSIA"
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    "overlap_duration_s": 14365,
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    "speed_summary": {
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            "max_sog": 1.8000000000000000444089209850062616169452667236328125
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    },
    "time_window": {
        "start": "2026-09-18T04:08:14+00:00",
        "end": "2026-09-18T08:07:39+00:00"
    },
    "points_count": {
        "vessel_a": 39,
        "vessel_b": 39
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 87,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 120m, avg 129m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 239 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VALERIY ZELENKO and ODIN) maintained close proximity (min 120m, avg 129m) for 239 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
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            "start_ts": "2026-09-18T04:08:14+00:00",
            "end_ts": "2026-09-18T08:07:39+00:00"
        },
        "searched_at": "2026-09-18T10:45:35.117331+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

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