In addition, the IAU adopted the new system of astronomicalĬonstants and time units in order to construct an inertial framework from observed IAU in Grenoble in 1976, the previous fundamental reference system FK4 has been replaced byįK5 at the epoch of J2000.0. Following the recommendation of the Sixteenth General Assembly of the System with three main axes in the direction of Galactic center, Galactic rotation, and International Astronomical Union (IAU) Sub-Commission 33b in the late 1950s ( Blaauw et al. The definition of the system of GalacticĬoordinates, which is based on the FK4 system at the epoch of B1950.0, was announced by the The Galactic coordinate system with its equatorial plane in the Galactic plane and with the Key words: astrometry / Galaxy: general / reference systemsįor studies of Galactic structure, kinematics, and dynamics, it is important to establish Reconsidering the definition of the Galactic coordinate system which should be directlyĬonnected with the ICRS for highly precise observations at the micro-arcsecond level. To avoid unnecessary misunderstandings, we suggest Transformation procedures, but we could not find a satisfactory Galactic coordinate system ICRS after carefully investigating the definition of the Galactic coordinate system and We tried to find the transformation matrix in the framework of the This has led to some confusion when applying of the Unrigorous transformation method from the FK4 to the FK5 and of the non-inertiality of theįK5 system with respect to the ICRS. WeĬonsider that the present Galactic coordinates may be problematic because of the However the definition of the Galactic coordinate system was not updated at that time. ICRS, which is a kinematical non-rotating system defined by a set of remote radio sources. In 1994, the IAU recommended that the dynamical reference system FK5 be replaced by the Transformed in 1984 from the B1950.0 FK4-based system to the J2000.0 FK5-based system. Initially defined by the IAU in 1958, the Galactic coordinate system was thereafter Zhang 1 ,2ĭepartment of AstronomyNanjing University,Į-mail: Laboratory of Modern Astronomy and Astrophysics (Nanjing Astronomical objects: linking to databases.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes
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