GB/T 35440-2017Specifications concerning designations for space high-energy astronomical radiation sources (English PDF)

2.1 High-energy astronomical radiation sources

Celestial bodies that radiate high-energy photons (energies above about 0.1 keV).

2.2 Celestial coordinate system

A spherical orthogonal coordinate system introduced to determine the position of a celestial body on the celestial sphere.

Note. The commonly used celestial sphere coordinate systems are. the horizontal coordinate system, the equatorial coordinate system, the ecliptic coordinate system, the galactic coordinate system.

[GB/T 30114.3-2014, Definition 3.15]

2.3 Equatorial coordinate system

Take the plane of the day equatorial plane as the basic plane, with the direction of vernal equinox or the meridian meridian circle as the starting direction,

Coordinate, declination latitude coordinate of the celestial sphere coordinate system.

Note. Depending on the principal point taken, the position of any point on the celestial sphere can be expressed in terms of both time and declination, and can also be expressed in terms of the right ascension and the declination.

[GB/T 30114.3-2014, Definition 3.20]

2.4 Right ascension; RA

The celestial coordinates of a certain point in the equatorial coordinate system, past the point of the RZR plane and the spring equinox points of the plane

The angle.

[GB/T 30114.3-2014, Definition 3.22]

2.5 Declination; Dec

The zenith coordinate of a point on the celestial sphere in the hour-and-white coordinate system and the equatorial coordinate system from the celestial equator of the celestial equator to the arc at that point

Long correspondence angle.

[GB/T 30114.3-2014, Definition 3.23]

2.6 Galactic coordinate system

With the plane of the galaxy as the basic plane, the direction from the sun to the center of the galaxy starts from the direction, and the silver through the latitude and longitude to the coordinates, silver latitude is the latitude […]