# `Sidereon.Encounter.Frame`
[🔗](https://github.com/neilberkman/sidereon-ex/blob/main/lib/sidereon/encounter/frame.ex#L1)

Relative encounter geometry at a common epoch.

Defines an orthonormal encounter frame and the relative state used by
conjunction and collision-probability calculations.

Axes:
- `x_hat`: In-plane cross-track axis.
- `y_hat`: Along relative velocity.
- `z_hat`: Encounter-plane normal.

# `t`

```elixir
@type t() :: %Sidereon.Encounter.Frame{
  miss_km: float(),
  relative_position_km: vec3(),
  relative_speed_km_s: float(),
  relative_velocity_km_s: vec3(),
  x_hat: vec3(),
  y_hat: vec3(),
  z_hat: vec3()
}
```

# `vec3`

```elixir
@type vec3() :: {float(), float(), float()}
```

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*Consult [api-reference.md](api-reference.md) for complete listing*