Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-10-19
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
10 pages, 3 figures, accepted for publication in A&A
Scientific paper
Initially defined by the IAU in 1958, the galactic coordinate system was thereafter in 1984 transformed from the B1950.0 FK4-based system to the J2000.0 FK5-based system. In 1994, the IAU recommended that the dynamical reference system FK5 be replaced by the ICRS, which is a kinematical non-rotating system defined by a set of remote radio sources. However the definition of the galactic coordinate system was not updated. We consider that the present galactic coordinates may be problematic due to the unrigorous transformation method from the FK4 to the FK5, and due to the non-inertiality of the FK5 system with respect to the ICRS. This has led to some confusions in applications of the galactic coordinates. We tried to find the transformation matrix in the framework of the ICRS after carefully investigating the definition of the galactic coordinate system and transformation procedures, however we could not find a satisfactory galactic coordinate system that is connected steadily to the ICRS. To avoid unnecessary misunderstandings, we suggest to re-consider the definition of the galactic coordinate system which should be directly connected with the ICRS for high precise observation at micro-arcsecond level.
Liu Jia-Cheng
Zhang Hong
Zhu Zi
No associations
LandOfFree
Reconsidering the galactic coordinate system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Reconsidering the galactic coordinate system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reconsidering the galactic coordinate system will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-267903