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/*
Implementing the "Two-line element set (TLE)", a data format encoding orbital elements of Earth-orbiting objects.
More information can be found here:
- https://en.wikipedia.org/wiki/Two-line_element_set
- https://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/SSOP_Help/tle_def.html
*/
package tle
// TLE defines the lines contained in a Two-Line-Element
type TLE struct {
TitleLine TitleLine `json:"titleline"`
LineOne LineOne `json:"lineone"`
LineTwo LineTwo `json:"linetwo"`
}
// TitleLine defines the first line in the the TLE
// It contains the name of the satellite
type TitleLine struct {
Satname string `json:"satname"`
}
// LineOne defines the first line in the TLE
type LineOne struct {
Linenumber int `json:"linenumber"`
// Catalog number defined by USSPACECOM
// A "U" indicates an unclassified object
SatelliteNumber int `json:"satellitenumber"`
Classification string `json:"classification"`
// International Designator containing information about the launch
InternationalDesignator InternationalDesignator `json:"internationaldesignator"`
// Epoch defining from when the TLE is
Epoch Epoch `json:"epoch"`
// First Time Derivative of the Mean Motion divided by two
// Unit: revs / day
// "catch all" drag term used in SGP4 USSPACECOM predictor
Firstderiv float64 `json:"firstderiv"`
// Second Time Derivative of Mean Motion divided by six (decimal point assumed)
// second order drag term in the SGP4
// Unit: revs / day^3
// A leading decimal must be applied to this value
// The last two characters define an applicable power of 10 (12345-5 = 0.0000012345)
Secondderiv float64 `json:"secondderiv"`
// Drag Term
// (67960-4 = 0.000067960)
// Unit: earth radii^-1
// The last two characters define an applicable power of 10
BSTAR float64 `json:"BSTAR"`
// The number 0 (originally this should have been "Ephemeris type")
Numberzero int `json:"numberzero"`
// Element set number. Incremented when a new TLE is generated for this object.
ElementSetNumber int `json:"elementesetnumber"`
// Checksum (modulo 10)
Checksum int `json:"checksum"`
}
// InternationalDesignator stores information about the satellite such as when it launched
type InternationalDesignator struct {
// Last two digits of launch year
Launchyear int `json:"launchyear"`
// Launch number of the year
Launchnumber int `json:"launchnumber"`
// Piece of the launch
Launchpiece string `json:"launchpiece"`
}
// Epoch defines a moment in time
type Epoch struct {
// Last two digits of the year
Year int `json:"year"`
// day of the year and fractional portion of the day
Dayfraction float64 `json:"dayfraction"`
}
// LineTwo of the TLE
type LineTwo struct {
Linenumber int `json:"linenumber"`
// Catalog number defined by USSPACECOM
SatelliteNumber int `json:"satellitenumber"`
// Inclination
// Unit: degrees
// Angle between the equator and the orbit plane
Inclination float64 `json:"inclination"`
// Right Ascension of the Ascending Node
// Unit: degrees
// Angle between vernal equinox and the point where the orbit crosses the equatorial plane (going north).
RightAscensionOfTheAscendingNode float64 `json:"rightascensionoftheascendingnode"`
// Eccentricity
// Constant defining the shape of the orbit (0=circular, Less than 1=elliptical).
// The value provided is the mean eccentricity.
// A leading decimal must be applied to this value
Eccentricity float64 `json:"eccentricity"`
// Argument of perigee
// Unit: degrees
// The angle between the ascending node and the orbit's point of closest approach of the earth (perigee)
ArgumentOfPerigee float64 `json:"argumentofperigee"`
// Mean Anomaly
// Unit: degrees
// The angle, measured from perigee, of the satellite location in the orbit referenced to a circular orbit
// with radius equal to the semi-major axis.
MeanAnomaly float64 `json:"meananomaly"`
// Mean Motion
// The value is the mean number of orbits per day the object completes. There are 8 digits after the decimal,
// leaving no trailing space(s) when the following element exceeds 9999.
MeanMotion float64 `json:"meanmotion"`
// The orbit number at Epoch Time. This time is chosen very near the time of true ascending node passage as
// a matter of routine. The last digit is the check sum for line 2.
RevolutionNumberAtEpoch int `json:"revolutionnumberatepoch"`
// Checksum (modulo 10)
Checksum int `json:"checksum"`
}
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