Time stability of ICRF

 

The data files and plots hereafter were derived from time series of source coordinates per session obtained by A. Fey, USNO (397 sources, left column) and C. Ma, GSFC (185 sources, right column).

A. Fey's time series of source coordinates are referred to one of three global analyses of data up to 2002.4 with a No Net Rotation (NNR) condition with respect to a subset of the ICRF. To avoid inconsistencies due to the NNR condition realization in the three analyses, that reach the level of 50 microarcseconds, the time series shown are series of differences with the mean coordinates of each source over the 1984-2002 time span.

From the analysis of these data over 1989.5-2002.4, M. Feissel-Vernier (2003, hereafter MFV2003) selected a subset of 199 stable sources. C. Ma's time series of coordinates are obtained from data up to 2003.0 with an NNR condition with respect to those stable sources. Note that, thanks to the better time stability of the NNR condition achieved with those stable sources, an additional set of 51 sources pass successfully the stability test in this new context.

The sources names are the IERS names. The IVS alternate name is given when different. The letters 'd', 'c', 'o' and 'n' refer to the ICRF source categories: Defining, Candidate, Other, New. The letters 's' and 'u' refer respectively to stable and unstable sources as detected by the MFV2003 selection scheme. The letter 'v' marks sources that should be considered with caution although they passed successfully the stability test. The sources with no stable/unstable status given are those that were not enough observed over 1989-2002 to be subjected to the stability selection scheme.

The plots are given both as gif and xml (resp. Plot and Votable).

The Data files give the relative yearly positions in the following format:


   Date   R.A.cos(D)    +/-       Delta       +/-    Number of       IERS
  (years)    (mas)     (mas)      (mas)      (mas)   sess. obs.    source name

 1984.00 -.4405E-01  .7048E-01  .2958E-01  .1401E+00   68  1564 0.  0851+202 


------------------------------------      ------------------------------------
    A. Fey analysis (up to 2002.4)            C. Ma analysis (up to 2003.0)
   Reference sources: ICRF Defining         Reference sources: MFV2003 Stable
------------------------------------      ------------------------------------
0003+380          d s: Plot Votable Data
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0055+300 NGC0315  n  : Plot Votable Data      0055+300 NGC0315  n u: Plot Votable Data
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2109-811          d u: Plot Votable Data      2109-811          d u: Plot Votable Data
2113+293          d u: Plot Votable Data      2113+293          d s: Plot Votable Data
2121+053          o u: Plot Votable Data      2121+053          o s: Plot Votable Data
2126-158          c u: Plot Votable Data      2126-158          c u: Plot Votable Data
2128+048          o  : Plot Votable Data      2128+048          o  : Plot Votable Data
2128-123          o s: Plot Votable Data
2131-021          c u: Plot Votable Data      2131-021          c u: Plot Votable Data
2134+004 2134+00  o s: Plot Votable Data
2136+141          d s: Plot Votable Data
2143-156          d u: Plot Votable Data
2144+092          c u: Plot Votable Data      2144+092          c u: Plot Votable Data
2145+067          d u: Plot Votable Data      2145+067          d u: Plot Votable Data
2149+056          c u: Plot Votable Data      2149+056          c u: Plot Votable Data
2149-307 2149-306 o s: Plot Votable Data
2150+173          d u: Plot Votable Data      2150+173          d u: Plot Votable Data
2155-152          o u: Plot Votable Data      2155-152          o u: Plot Votable Data
2200+420 VR422201 o s: Plot Votable Data
2201+315          o s: Plot Votable Data
2209+236          d s: Plot Votable Data
2216-038          o s: Plot Votable Data
2227-088          c u: Plot Votable Data
2229+695          d u: Plot Votable Data      2229+695          d u: Plot Votable Data
2230+114 CTA102   o s: Plot Votable Data
2232-488          d u: Plot Votable Data      2232-488          d  : Plot Votable Data
2233-148          c u: Plot Votable Data
2234+282          c u: Plot Votable Data      2234+282          c u: Plot Votable Data
2235+731          n  : Plot Votable Data      2235+731          n  : Plot Votable Data
2243-123          o u: Plot Votable Data      2243-123          o u: Plot Votable Data
:2245-328          c u: Plot Votable Data      2245-328          c u: Plot Votable Data
2250+190 2250+194 n  : Plot Votable Data      2250+190 2250+194 n  : Plot Votable Data
2251+158 3C454.3  o u: Plot Votable Data      2251+158 3C454.3  o u: Plot Votable Data
2252-090 2252-089 c  : Plot Votable Data
2253+417          c s: Plot Votable Data
2254+024          c u: Plot Votable Data      2254+024          c s: Plot Votable Data
2254+074          d u: Plot Votable Data      2254+074          d u: Plot Votable Data
2255-282          o s: Plot Votable Data
2318+049          c s: Plot Votable Data
2319+272          d u: Plot Votable Data      2319+272          d u: Plot Votable Data
2320-035          c u: Plot Votable Data
2326-477          d u: Plot Votable Data      2326-477          d  : Plot Votable Data
2328+107          c u: Plot Votable Data      2328+107          c s: Plot Votable Data
2331-240          c u: Plot Votable Data
2335-027          c s: Plot Votable Data
2337+264          o u: Plot Votable Data      2337+264          o u: Plot Votable Data
2344+092 2344+09A c u: Plot Votable Data      2344+092 2344+09A c u: Plot Votable Data
2345-167          o u: Plot Votable Data      2345-167          o  : Plot Votable Data
2351+456          o s: Plot Votable Data
2352+495          o  : Plot Votable Data      2352+495          o  : Plot Votable Data
2355-106          c s: Plot Votable Data
2355-534          c  : Plot Votable Data      2355-534          c  : Plot Votable Data
2356+385          c u: Plot Votable Data      2356+385          c u: Plot Votable Data