International Journal of Astrophysics and Space Science

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: Oct. 14, 2022
    Accepted: Jan. 06, 2023
    Published: Feb. 21, 2023
    Downloads:
    Views:
    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
  • 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: Mar. 08, 2023
    Accepted: Apr. 04, 2023
    Published: Apr. 24, 2023
    Downloads:
    Views:
    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