Celestial Mechanics and Dynamical Astronomy

FIGURE I - 2-yr IMPACT FACTOR EVOLUTION
Source: ISI Journal Citation Reports 1997-2009



The impact factor in a year N is the number of citations in that year of papers published in the years N-1 and N-2, divided by the total number of papers published by the journal in those 2 years. The impact factor of "Celestial Mechanics and Dynamical Astronomy" reached 1.811 in 2009



FIGURE II - IMPACT FACTORS IF-2 to IF-5
Source: ISI Journal Citation Reports 1997-2009



The impact factors  IF-X  in a year N are given by the number of citations in that year of papers published in the years N-1 to N-X, divided by the total number of papers published by the journal in those X years. The IF-5 is the new 5-yr impact factor introduced since 2007 by the ISI. It was computed for the years prior to 2007 with the data taken from the ISI Journal Citation Reports since  2001.
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Half-Life:
The impact factor does not take into account the lifetime of the papers published in the journal. The half-life of the papers published in "Celestial Mechanics and Dynamical Astronomy" is  > 10.0 years. In Astronomy, there are only ~10 journals (out of  ~50) with half-life > 10.0 years.
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Rankings based on IF-2:
In the JCR 2009, Celestial Mechanics and Dynamical Astronomy appears in two comparative journal summary lists;.
In the list MATHEMATICS, INTERDISCIPLINARY APPLICATIONS it appears in rank 14 (out of 80 journals).
In the list ASTRONOMY & ASTROPHYSICS it appears in rank 26 (out of 53 journals)..