Class: Astronoby::Astrometric

Inherits:

ReferenceFrame

• Object
• ReferenceFrame
• Astronoby::Astrometric

Defined in:

lib/astronoby/reference_frames/astrometric.rb

Overview

Astrometric reference frame (GCRS). Represents a body’s position relative to the Earth, corrected for light-time delay.

Instance Attribute Summary

Attributes inherited from ReferenceFrame

#center, #instant, #position, #target_body, #velocity

Class Method Summary

• .build_from_geometric(instant:, earth_geometric:, light_time_corrected_position:, light_time_corrected_velocity:, target_body:) ⇒ Astronoby::Astrometric

  Builds an astrometric frame from geometric frames with light-time correction.

Methods inherited from ReferenceFrame

#distance, #ecliptic, #equatorial, #initialize, #separation_from

Constructor Details

This class inherits a constructor from Astronoby::ReferenceFrame

Class Method Details

.build_from_geometric(instant:, earth_geometric:, light_time_corrected_position:, light_time_corrected_velocity:, target_body:) ⇒ Astronoby::Astrometric

Builds an astrometric frame from geometric frames with light-time correction.

Parameters:

• instant (Astronoby::Instant) —

  the time instant

• earth_geometric (Astronoby::Geometric) —

  Earth’s geometric frame

• light_time_corrected_position (Astronoby::Vector<Astronoby::Distance>) —

  target position corrected for light-time delay

• light_time_corrected_velocity (Astronoby::Vector<Astronoby::Velocity>) —

  target velocity corrected for light-time delay

• target_body (Astronoby::Body, nil) —

  the target body

Returns:

• (Astronoby::Astrometric) —

  a new astrometric frame

# File 'lib/astronoby/reference_frames/astrometric.rb', line 18

def self.build_from_geometric(
  instant:,
  earth_geometric:,
  light_time_corrected_position:,
  light_time_corrected_velocity:,
  target_body:
)
  new(
    position: light_time_corrected_position - earth_geometric.position,
    velocity: light_time_corrected_velocity - earth_geometric.velocity,
    instant: instant,
    center: Center.geocentric,
    target_body: target_body
  )
end