GEO Slot Index #1

Method

• Occupancy window is ±0.4° on the TLE-primary longitude (Space-Track TLE when quality gates pass; UCS catalog otherwise). TLE longitude is a tracked-object location, never an FCC assignment or ITU filing.
• Entered = in the TLE window, UCS catalog longitude outside it. Left = UCS still lists the bird at this slot, TLE occupancy is elsewhere (ghosts). This is a catalog-vs-ephemeris cut, not a dated tape of station-keeping burns.
• Dispute flip = in-window satellite with circular |UCS−TLE| > 2° (positionDisputed).
• FCC deltas = SSAL rows at the license longitude vs occupancy names. A DIRECTV call sign at 101°W is a license record; it is not proof the satellite is still on station.

Feeds this edition: UCS file vintage 2023-04-07 · FCC SSAL as-of 2026-09-27 · TLE epoch through 2026-11-01. Machine-readable changes are GET /api/v1/agents/deltas. That route is the Slot Index delta feed, not this method note. See Docs · data trust · agent API · valuation v0 · FCC refresh.

What this is not

Not a price index, bid/ask, last trade, or appraisal. Implied fair value v0 lives on Slot Terminal as a labeled model. Curated dollar overlays are hand estimates. This page does not reprint them. ITU filings are not in this product. ITU Space Explorer is the current ITU source. SNS Online shut down in January 2025; Clarke does not record ITU deeds. BIU here is a Clarke hint.

Registry operator SES. Occupancy ±0.4° TLE-primary: 4 sats. Congestion 63 (High). BIU hint: brought into use.

Occupancy entered

TLE in this window, UCS catalog longitude not in this window.

Occupancy left

UCS still lists the bird here; TLE occupancy is elsewhere (ghosts).

Dispute flips (|UCS−TLE| > 2°)

FCC deltas (license longitude vs occupancy)

FCC names not in TLE-primary occupancy: DIRECTV D16. License longitude is not TLE station.

Occupancy names without a matching FCC row: SDO (Solar Dynamics Observatory); AT&T T16.

FCC as-of 2026-09-27 · TLE epoch 2026-10-26 to 2026-11-01 · UCS vintage 2023-04-07

Registry operator SES. Occupancy ±0.4° TLE-primary: 4 sats. Congestion 53 (Moderate). BIU hint: foreign operating.

Occupancy entered

TLE in this window, UCS catalog longitude not in this window.

Occupancy left

UCS still lists the bird here; TLE occupancy is elsewhere (ghosts).

Dispute flips (|UCS−TLE| > 2°)

FCC deltas (license longitude vs occupancy)

No FCC SSAL row at this longitude (expected for many non-US administrations).

FCC as-of 2026-09-27 · TLE epoch 2026-10-30 to 2026-11-01 · UCS vintage 2023-04-07

Registry operator Eutelsat. Occupancy ±0.4° TLE-primary: 3 sats. Congestion 38 (Moderate). BIU hint: foreign operating.

Occupancy entered

TLE in this window, UCS catalog longitude not in this window.

Occupancy left

UCS still lists the bird here; TLE occupancy is elsewhere (ghosts).

Dispute flips (|UCS−TLE| > 2°)

FCC deltas (license longitude vs occupancy)

No FCC SSAL row at this longitude (expected for many non-US administrations).

FCC as-of 2026-09-27 · TLE epoch 2026-11-01 · UCS vintage 2023-04-07

Registry operator SES. Occupancy ±0.4° TLE-primary: 1 sat. Congestion 35 (Moderate). BIU hint: brought into use.

Occupancy entered

TLE in this window, UCS catalog longitude not in this window.

Occupancy left

UCS still lists the bird here; TLE occupancy is elsewhere (ghosts).

Dispute flips (|UCS−TLE| > 2°)

FCC deltas (license longitude vs occupancy)

FCC as-of 2026-09-27 · TLE epoch 2026-11-01 · UCS vintage 2023-04-07

Registry operator Astranis. Occupancy ±0.4° TLE-primary: 0 sats · paper FCC filing (no occupancy longitude in window). Congestion 0 (Sparse). BIU hint: paper filing.

Occupancy entered

TLE in this window, UCS catalog longitude not in this window.

Occupancy left

UCS still lists the bird here; TLE occupancy is elsewhere (ghosts).

Dispute flips (|UCS−TLE| > 2°)

FCC deltas (license longitude vs occupancy)

FCC names not in TLE-primary occupancy: ARCTURUS. License longitude is not TLE station.

FCC as-of 2026-09-27 · TLE epoch n/a · UCS vintage 2023-04-07

Caveats

• UCS snapshot vintage is years behind TLE. Ghosts are expected; they are the point of TLE-primary occupancy.
• One-shot Space-Track ingest produced thousands of relocation events vs the previous UCS clustering. Those events are not a weekly enter/leave time series and are not used as such here or in the agent delta feed. The change list now records a relocation only for a current station-kept payload when the shift is at least 1 degree past the drift mean motion predicts. Debris and rocket bodies are not listed.
• FCC workbook as-of can be stale (banner on Terminal when older than 45 days). Name matching between SSAL and UCS is imperfect (AT&T T16 vs DIRECTV D16).
• An FCC row with no satellite in the occupancy window is not an empty-slot census. The spacecraft can sit outside the window, or it can have launched after the UCS snapshot.