Category Archives: IJAA

International Journal of Astronomy and Astrophysics

Halo Orbits around Sun-Earth L1 in Photogravitational Restricted Three-Body Problem with Oblateness of Smaller Primary

Author(s): Prithiviraj Chidambararaj, Ram Krishan Sharma ABSTRACT This paper deals with generation of halo orbits in the three-dimensional photogravitational restricted three-body problem, where the more massive primary is considered as the source of radiation and the smaller primary is an … Continue reading

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Possible Duplicities of Five Asteroids

Author(s): Isao Satō, Hiromi Hamanowa, Hiroyuki Tomioka, Sadaharu Uehara ABSTRACT Some evidences of possible duplicities of five asteroids are presented. A satellite of (279) Thule was convincingly detected by a stellar occultation on 2008 April 3 by Thule and also … Continue reading

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Doing Astronomy with Small Telescopes

Author(s):Kangujam Yugindro Singh, Irom Ablu Meitei, Salam Ajitkumar Singh ABSTRACT We are playing a lead role for growth of astronomy and its quality teaching and research in Manipur, a State located at northeast India (longitude = 93°58’E; latitude = 24°44’N; … Continue reading

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Collaboration of many professional and amteur astronomers revealed a 3-D shape of an asteroid

Author:Isao Satō Asteroids are very small celestial bodies and invisible with naked eyes beyond seveal hundreds million kilometers from the earth between the orbits of Mars and Jupiter. So it is difficult to study its size, shape, composition and other … Continue reading

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Partial Frequencies and Chladni’s Law in Church Bells

Author(s) :William A. Hibbert, David B. Sharp, Shahram Taherzadeh, Robert Perrin   The rim partials of a church bell (those with an antinode at the soundbow) generate the strike pitch or perceived note of the bell. The spacing in frequency of the higher rim … Continue reading

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Isli and Tislit: The First Dual Impact Crater Discovered in Morocco

After a few months of studies, a group of geologists from the Ibn Zohr University concludes that strange lakes, well known in the region Imilchil (Morocco) are the remains of a double impact crater done by a falling meteorite dating … Continue reading

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Asymmetry of Sunspot Distribution – What Does this Mean? Is there any Relation to Global Worming?

The solar activity features on the solar disk are not identical in the northern or the southern solar hemispheres. This North-South asymmetry (ANS) is considered to be a new index to tracing the nature of solar activity and the solar … Continue reading

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Black Holes Are Only Half of Their Previously Predicted Size

First discovered in 1971, Black Holes, as predicted by Einstein’s general relativity are regions in the space-time where the gravitation field is so intense that even light cannot escape it. The theory of general relativity predicts that a sufficiently compact mass will deform space-time … Continue reading

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