International Journal of Astrophysics and Space Science

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Volume 11, Issue 1, March 2023

  • A New General Perturbation Method for Determining the Long-Term Motion of Comets

    Robert Bayne Brown

    Issue: Volume 11, Issue 1, March 2023
    Pages: 1-6
    Received: 14 October 2022
    Accepted: 6 January 2023
    Published: 21 February 2023
    DOI: 10.11648/j.ijass.20231101.11
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    Abstract: A number of authors have used special perturbation methods to propagate Comet Halley back before its oldest observation in 239 BC. Unfortunately, results from these studies vary drastically because it is so difficult to accurately model nongraviatational forces acting on comets. In contrast, general perturbation methods do not need to model any for... Show More
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  • Effects of Spin Properties on Braking Indices of 208 Glitching Pulsars

    Juliana Nwakaego Odo, Azubuike Christian Ugwoke

    Issue: Volume 11, Issue 1, March 2023
    Pages: 7-14
    Received: 8 March 2023
    Accepted: 4 April 2023
    Published: 24 April 2023
    DOI: 10.11648/j.ijass.20231101.12
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    Abstract: Pulsars are stars that emit electromagnetic radiation in a definite time interval. Detailed study of the long-term timing observations of pulsars indicate that the predictable smooth spin- down of pulsars is predisposed to discrete fluctuations known as glitch. The rotation frequency of pulsars decays with time as quantified by the braking index (n... Show More
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