Proper Motion of 3C273.

Abstract

view Abstract Citations (2) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Proper Motion of 3C273. Jefferys, William H. Abstract The absolute proper motion of the radio source 3C273 has been determined from measurements on 14 plates covering the period 1887-1963. Two kinds of material were used to establish the proper motion system of the FK3. Eighty-two positions of 14 reference stars were obtained and corrections were applied to reduce them to the fundamental system; and statistical proper motions for 48 reference stars were calculated with the aid of material compiled by Vyssotsky and Williams (Publ. McCormick Obs. 10,1948). The material was formed into one set of normal equations and the solution of this system of equations effected by means of principles developed by Eichhorn (Astron. Nachr. 285, 233, 1960) and Jefferys (Astron. J. 68,111,1963). Since the FK3 uses Newcomb's constants of precession, the resulting FK3 proper motion must be corrected for the errors in Newcomb's constants. When this has been done, the absolute proper motion of the object, with its mean error, becomes ~= +0"0009+0'.'0025/yr, I a= -01.'0012~0'.'0025/yr. Therefore, the absolute proper motion of the object is zero within this rather small mean error, which constitutes strong evidence that the object is extragalactic. Publication: The Astronomical Journal Pub Date: March 1964 DOI: 10.1086/109243 Bibcode: 1964AJ.....69..142J full text sources ADS |